Whoop MG: One minute review

I really didn’t know what to make of the Whoop MG; I loved it and disliked it in equal measure. On the one hand, it’s a brilliant fitness tool, with a simple-yet-deep interface boasting comprehensive metrics. It’s got an in-app workout builder worthy of any of the best fitness apps, and an intuitive journaling mechanism. The journal entries you record feed into your recovery and strain information in a simple, clever way.

It’s really easy to use; being screenless, you hardly interact with it at all beyond taking the occasional ECG scan or switching off its haptic alarm with a few taps. Instead, all the interaction is done via the app, with the app sending through push notifications when it’s time for bed, or when the app needs a piece of information clarified with a quick journal entry.

Despite its limited interface, it’s a sophisticated tool, packing a host of heart health features including ECG to test for atrial fibrillation (the MG in its name stands for Medical Grade) and estimated blood pressure, which requires calibration with a cuff. Its new Healthspan tool gives you the Whoop Age metric, which is similar to Fitness Age on one of the best Garmin watches, or Metabolic Age on continuous glucose monitors like Abbott’s Lingo.

On the other hand, certain aspects of the tracker stop me short from recommending it for everyone. For one thing, the price for the Whoop MG – it’s only available on its premium Life subscription, with the medical-grade heart-screening features – is extortionate.

The lower-tier wearable, the Whoop 5.0, starts at a much more reasonable £169 / $199 / AU$299 per year. For this price, you can get a Whoop One subscription, which gives you the Whoop 5.0 device but locks metrics like Stress and Whoop Age behind a paywall. Instead, you get those (along with a nicer band and the wireless charger) with a Whoop Peak membership, which costs £229 / $239 / AU$419 per year. Then at the top end you get the Whoop Life subscription plan at £349 / $359 / AU$629 per year for life, which comes with the premium Whoop MG device with heart screening and ECG features. Stop paying at any tier level, and your Whoop reverts to an inert hunk of plastic at the end of your membership.

I tested the top-tier, super-premium Whoop MG, but the hardware is fiddly at times. Unbuckling the strap causes the metal clasp to come completely detached more often than not, the alarm is hard to turn off at times, while taking ECGs failed as often as it succeeded. Looking around the web, these aren’t isolated incidents.

It’s an impressive, sophisticated fitness tracker that some people will love, but I came away disliking it. While I appreciate that some people will see the subscription-based model as a monthly health investment, at this premium tier I don’t think the value is there, unless you’re very wealthy and extremely athletic or concerned about monitoring your health. Essentially, that makes it Batman’s ideal fitness tracker.

Whoop MG: Price and availability

• Whoop Life (MG): £349 / $359 / AU$629 per year
• Whoop Peak (5.0): £229 / $239 / AU$419 per year
• Whoop One (5.0): £169 / $199 / AU$299 per year

The Whoop MG’s value score, from the outset, is hampered by the membership scheme, especially as Whoop promised existing members free upgrades to the 5.0, turned back on that promise, then doubled back again after user outcry.

The Whoop MG device I’m testing is only available with the Whoop Life subscription, the most expensive tier.

The Whoop 5.0, without an ECG, blood pressure or Heart Screener features and more accurate, starts at the basic Whoop One tier (£169 / $199 / AU$299 per year), which offers Strain, Recovery, Sleep, VO2 Max, heart rate zones, steps, Strength Trainer, menstrual cycle insights and journal features. However, you don’t get the Whoop MG’s premium band and wireless charger, and software features Whoop Age, Stress and Health Monitor, which are locked behind a paywall.

For an extra $40 / £60 / AU$120 per year you can get Whoop Peak, which adds those hardware and software features back in. Now, all that you’re missing are the heart health features and improved accuracy for stats like menstrual cycle insights with the improved sensor array, which you get by spending another $120 / £120 / AU$210 per year on top of the Whoop Peak price for Whoop Life (£349 / $359 / AU$629 per year).

As we’re reviewing the Whoop MG, I’ll be focusing on this most expensive price tier, and to spend this sort of money on a wearable is far from unheard of – as a one-off payment, that is. To spend it annually is mad to me. Even though the app is terrific, it would have to do everything, pack GPS for better running insights, and make my coffee in the morning for me to consider this a good deal.

Things get a little better as you go down the tiers, as once you break down the cost by month, a subscription that aids your health and fitness in the way Whoop does starts to sound more reasonable. But even the best smartwatches, many of which offer excellent fitness credentials of their own, are a one-time payment – meaning Whoop will eventually out-cost them.

• Value score: 2/5

Whoop MG: Design

• Excellent app user experience
• Totally screenless
• Poor clasp

First things first: anyone who’s seen a Whoop device before will know it’s not a smartwatch. It’s a completely screenless plastic fitness tracker with its sensor array on the underside, wrapped using a Superknit or Coreknit polyester-fabric wristband over the top of the device. A bicep Coreknit band is also available. I like the screenless design – it’s distraction-free, and very easy to wear day-to-day.

Holding it all together is a stainless-steel buckle with a crossbar on one end to hook the fabric band, and two short pins to attach to the tracking device on the other end. This was one of my main hardware frustrations: I get that you’re not supposed to take the band off that often, but when I unclipped the band the buckle came off completely maybe one out of every three times. I had to forcibly bent the metal a couple of times to get it to stay put.

The design of the app, however, is very good – it’s one of the most user-friendly fitness apps I’ve tried in a long time. It’s easy to navigate, using color and circular graphs to provide clear context for your reams of data. The workout builder and journal functionality are intuitive and feed into other metrics. The only issue I had is that when viewing detailed heart rate graphs, the app inexplicably shifts to landscape mode.

• Design score: 3.5/5

Whoop MG: Features

• Automatic workout detection
• Very detailed, comprehensive metrics
• Workout builder

Whoop’s screenless ‘set-and-forget’ tracker is possible thanks to its advanced activity detection functionalities. Once the software learns what kind of workouts you take part in most often, it’s very good at anticipating your movements, tracking and logging them as the correct workouts. Towards the end of my testing, it successfully logged running and weightlifting workouts separately, without prompting.

Speaking of weightlifting, the workout builder is intuitive and fantastic to use, both as a diary of your strength-training progress and a way for the app to better pinpoint the amount of strain the workout placed on your body. I was able to create routines in advance and assign them to workout instances, and I was able to create and edit them on the fly if I had to go up or down a weight during a lift, for example.

Only a few very specific movements were missing, such as resistance band-assisted pull-ups, but for the most part its workout library was vast and comprehensive.

The Whoop Coach AI chatbot was also surprisingly useful, putting my personal statistics into context with its library of science-based advice.

The Whoop MG has an ECG feature, automatically exporting an ECG report that you can share with a doctor. Its blood pressure detection requires prior calibration with a blood pressure cuff for it to work, then estimates your blood pressure fluctuations based on other metrics. Otherwise, your step count, calorie burn, heart rate, sleep duration and more are folded into a trio of metrics, each scored out of 100: sleep, a measure of your overall sleep quality; recovery, the percentage of which your body has recovered from exertion or stress; and strain, which is how much stress you’re putting on your body during the day.

A ‘strain threshold’ is calculated based on your recovery and activity levels, indicating how strenuous your day should and can be before it veers into detrimental territory. Detailed graphs plot your stress, relation between strain and recovery, daily heart rate and more. With such a mass of information, it would be so easy for this to become confusing, but Whoop does a great job of packing a lot of information into the app without it feeling impenetrable.

• Features score: 4/5

Whoop MG: Performance

• Battery life is excellent
• Accurate heart rate and sleep tracking
• Geared for optimization

I found the Whoop matched up closely during testing with other wrist-based devices such as the Apple Watch Ultra 2 when it comes to heart rate tracking: in other words, it’s as good as it gets on your wrist. The sleep tracking was also accurate, recording without fail each time I woke up in the middle of the night.

Battery life was excellent. I averaged about nine days with the Whoop MG before I needed to use the attached charger, and even then I just clipped it on while I worked at my desk, and charged the device up without taking it off.

Generally, it was a terrific device, and I enjoyed my time with the Whoop. Its metrics aren’t just detailed, they’re actionable, offering plenty of context rather than spewing forth useless numbers in a vacuum. It doesn’t just tell you your sleep score, but also how to improve it.

However, I don’t think I’m necessarily the target audience for this device – I know it’s optimal, but I do not want to go to bed at 9pm, no matter what Whoop thinks my sleep need is. As it was telling me to wind down for the night, I was ramping up: I’d worked late, cooked late, and then had to do the dishes and sort some paperwork I’d been putting off. Only changing my goals in the app from “reach my sleep need” to “improve my sleep” stopped the Whoop MG from nagging me with push notifications at 8:30pm.

Well, almost. When I did take the device off, inside of 15 minutes, and without fail, I got a push notification telling me to reattach it, which irked me to no end. This is one of the most comprehensive fitness trackers I’ve ever tried, and certainly the best option for workout and recovery tracking if you don’t care about detailed running metrics; but it’s for the optimization-obsessed, and those who can afford its exorbitant annual fees.

• Performance: 4/5

Scorecard

Whoop MG: Should I buy?

Buy it if...

Don't buy it if...

Also consider

We're currently testing the Polar Loop and Amazfit Helio Strap, both screenless fitness trackers new for 2025 pitched as Whoop competitors. Check back soon for our full reviews on both devices.

How I tested

I wore the Whoop MG for 21 days, testing its medical ECG feature, building workouts, wearing it almost constantly, asking questions of its chatbot, and exploring the app in detail. I compared it against the Apple Watch Ultra 2 on a hike, wearing one device on each wrist.

First reviewed: September 2025

Noise Luna Ring (Gen 1): One-minute review

Smart rings are having a moment, and the Noise Luna Ring (Gen 1) wants in. While it’s not technically the brand's first ring, this version is being positioned as its first official release. It’s entering a space packed with competition, from premium names like Oura to value picks like the Amazfit Helio. So, how does it hold up?

The Luna Ring gets quite a lot right. It’s comfortable to wear day and night, tracks sleep and health metrics well, and offers genuinely helpful insights in the app – I liked the explanations of why scores or stats were outside of my usual range and a little “Health Monitor” dashboard gives you a quick glance at your key vitals.

But it also feels like a work in progress. The app is packed with info, but the copy and UI still need refinement. The design isn’t as sleek as some rivals – my gold version looked a little chunky and plasticky – and the battery life is a little less than rivals. There are also some quirks, like a clunky AI chatbot and occasional syncing glitches.

That said, Noise seems to know this. A second-gen version is already on the way, with promised upgrades to charging, battery, stress tracking, and design. I’m already feeling pretty confident it’ll enter our best smart rings guide in a strong position.

However, that leaves the Gen 1 I’m reviewing here in a tricky spot. Because I liked it, but with Gen 2 on the horizon and stronger rivals already on shelves, it’s hard to recommend right now – unless you’re specifically avoiding subscriptions and are happy to support an evolving brand.

Noise Luna Ring (Gen 1) review: Price and availability

• Available now for $300 / around £234 / AU$500
• Pricier than a lot of the competition
• Comes in several colors

The Noise Luna Ring (Gen 1) is priced at $300 / around £234 / AU$500, and comes in silver, gold, matte black, rose gold, and shiny black.

It’s cheaper than the Oura Ring Gen 4, which starts at $349 / £349, though premium finishes cost more – and Oura requires a monthly subscription for full feature access. The Samsung Galaxy Ring is more expensive than both at $399 / £399 / AU$749.

However, it’s significantly more expensive than budget-friendly rivals, like the Amazfit Helio Ring (around $199.99 / £169 / AU$269), which I recently tested and rated highly as a more affordable choice.

While not as expensive as the more premium picks, it’s still bold pricing for a new player. And while the Luna Ring holds its own in some ways, it’s hard to justify that price when refinement and hardware polish fall just a little short.

• Value score: 3.5 / 5

Noise Luna Ring (Gen 1) review: Specifications

Noise Luna Ring (Gen 1) review: Design

• 3-4g depending on the size you get
• A very comfortable fit
• Felt a tad less refined than rivals

The Luna Ring is lightweight and comfortable, even for sleep tracking – and that’s no small thing. I wore it 24/7 during testing and rarely noticed it was there.

That said, it’s a little chunkier than rivals like the Oura or Amazfit Helio rings, standing off my finger slightly more despite being the correct size. Only ever so slightly, but that’s still significant on a ring this size. I ended up wearing it on my index finger for this reason, where it felt the most balanced.

I was sent the gold version, and personally, I wasn’t a fan. The shiny gold finish cheapened the look and made the ring feel plasticky. I think other colorways would be a better bet for most people and there are plenty to choose from here – though be warned that matte finishes do tend to scratch more easily in my experience.

As ever, design is subjective. I know a lot of people like the bold, gold and shiny look. But Luna’s overall build feels just a tad less premium than the top smart rings on the market, especially considering the price. It’s worth mentioning here that the Noise team tells us the Gen 2 version will be smaller and lighter.

• Design score: 3.5 / 5

Noise Luna Ring (Gen 1) review: Features

• Loads of data tracked
• LunaAI assistant needs work
• Adequate workout tracking

The Luna Ring tracks a wide range of metrics from its tiny sensors, including sleep stages and sleep score, resting heart rate (RHR), respiratory rate, HRV (heart rate variability), blood oxygen (SpO2), temperature changes, stress, activity score, readiness score and more.

That’s everything you'd expect from a full-featured health tracker, and the Health Monitor dashboard is a particularly nice touch. It gives you a quick snapshot of how your core metrics are doing day to day, without needing to scroll through graphs. I found myself using it regularly, especially when I didn’t want to dive into the data.

The ring also includes basic workout tracking, with activity options like walking, running, cycling, football, and freestyle modes. It’s not built for serious training – no smart ring is yet – but the inclusion is still useful. You can also sync workouts from third-party apps via Google Fit and Apple Health.

Then there’s LunaAI, which is a chatbot-style assistant baked into the app. It’s clearly a flagship feature for the brand, but right now, it feels undercooked. It can provide explanations for sleep and recovery metrics, and even build basic workout plans. But when it told me I’d “exceeded my sleep by 27,690 seconds,” I wasn’t exactly blown away. Technically true, but not exactly meaningful, similar to the AI insights on Garmin Connect+. It’s more a glossary and content hub than a true AI assistant.

As for the app itself, I really liked it. The layout is intuitive, the calming colors are nice, and the home screen dashboard feels Oura-inspired in a good way. On the home screen you'll find everything you need to know about your day and how you’re doing. Then along the menu bar your data is divided into Sleep, Readiness and Activity, all of this is on the home page, but you can dig deeper in each of the dedicated sections.

My only bugbear with the app is the copy could use refinement. Some of the text sounds clunky and is oddly worded and also looks quite tiny, which takes the shine off what is otherwise a premium-feeling experience.

• Features score: 4 / 5

Noise Luna Ring (Gen 1) review: Performance

• Good sleep tracking
• Nice contextual insights
• Disappointing 3-4 days battery life

Overall, performance was solid, especially when it came to sleep tracking, which is clearly a key focus for the Luna Ring. It accurately picked up my sleep and wake times, even on restless nights (which many trackers have missed). You get detailed sleep stage breakdowns, insight into what’s affecting your score, and helpful trends over time. The sleep planner is also a great addition, letting you set sleep and wake targets to build a more consistent routine – perfect if you’re trying to reset your sleep habits.

Activity tracking is more of a mixed bag. There are several workout modes available, but none dedicated to strength training or yoga – my two go-to workouts. That said, the freestyle mode delivers decent data, including duration, calories burned, max and min heart rate, and a well-designed bar graph showing your time in heart rate zones. If more activity types were included, you'd likely get more accurate calorie data, but as a general log, it’s fine. Syncing with Apple Health or Google Fit helps fill in the gaps if you’re already using another fitness platform.

Accuracy overall was strong. I tested the Luna Ring alongside several other smart rings and wearables, and the data for heart rate and sleep consistently matched up. Step counts were slightly underreported at times, but never dramatically so.

Connectivity was decent once things were set up. I ran into a few syncing issues during setup and when the battery was running low, but after that it was mostly smooth sailing. Bluetooth pairing worked reliably, and the app refreshed with new data quickly.

One feature I genuinely appreciated was the contextual insights. When, for example, my temperature deviated from its usual range, the app didn’t just flash a warning – it explained what might cause the change and how to address it. This kind of guidance makes the Luna Ring feel smarter than many other wearables, which often highlight problems without offering any helpful next steps.

That said, the in-app advice's tone and wording could use some polishing to better match the premium feel Noise is aiming for. At times, the wording felt slightly robotic or abrupt. For example, when some of my data synced, the app flagged it with a red alert that simply said “Pay attention”, which felt vague and a bit cold, especially in that context.

Another time I received a “Proceed as planned” message after a strong readiness score. Technically accurate, but it lacked warmth or context, making the experience feel slightly jarring. I don’t expect emotional support from a wearable, but I do expect the language to feel well-considered and aligned with the rest of the experience. Right now, the tone just doesn’t quite land. Other wearables strike a better balance here.

Battery life, however, is one of the Luna Ring's weak spots. Luna claims 5–6 days, but I consistently got just under 4. That’s significantly shorter than the Oura Ring 4 (6 days), Ultrahuman Ring Air (6–7 days), and even the upcoming Samsung Galaxy Ring (up to 7 days). Battery life is crucial in a smart ring – the whole appeal is wearing it 24/7, and frequent charging breaks that flow. This is one of the areas the brand says it will improve in Gen 2, and it absolutely needs to.

Charging is handled via a small base, which requires placing the ring in a very specific position to connect. It’s not intuitive at first, but becomes second nature with regular use – still, a snap-on charger would be much easier.

• Performance: 4 / 5

Scorecard

Should I buy the Noise Luna Ring (Gen 1)?

Buy it if…

Don’t buy it if…

Noise Luna Ring (Gen 1): Also consider

How I tested the Noise Luna Ring (Gen 1)

• Paired with an iPhone 14 Pro
• Wore the ring 24/7
• Tested loads of wearables over 12+ years

I tested the Noise Luna Ring (Gen 1) for several weeks, paired with an iPhone 14 Pro. I wore it 24/7 – through outdoor runs, gym sessions, long workdays in coffee shops, evenings at home, and while sleeping. The only time I took it off was for charging and showers (even though it’s waterproof, I didn’t want to risk soap and shampoo interfering with the sensors).

I’ve tested dozens of wearables over the past decade, including smart rings from Oura, Ultrahuman, RingConn, Motiv, and more. Having worn so many, I’ve got a strong sense of what makes a smart ring truly useful – from design and comfort to performance, app quality, and long-term wearability.

• First reviewed in April 2025

• Read TechRadar's reviews guarantee

Amazfit Helio Ring: One-minute review

The Amazfit Helio Ring is the first smart ring from Chinese tech company Amazfit, best known for its budget-friendly fitness trackers, like the Amazfit Active 2 and its new open-ear earbuds, the Amazfit Up. Staying true to its brand, the Helio Ring undercuts the competition on price, offering a more affordable alternative to rivals like Oura with no added subscription fee.

The design is sleek and minimalist, with a titanium outer shell, and the ring is very comfortable to wear all day and night – possibly the most comfortable smart ring I’ve tested. The downside? It comes in just one finish and only three size options at the time of writing, which significantly limits your choice compared to competitors.

Functionally, the Helio Ring is built for sleep and wellness tracking. It offers in-depth sleep insights, heart rate monitoring, and energy tracking. There’s no auto-detection for workouts and there are only four workout modes to pick from. But, if one of those is your exercise of choice, you do get comprehensive data after each workout – and heart rate tracking as you exercise is accurate, too.

Having said that, if you’re looking for a fully-fledged fitness tracker, this isn’t it. Most smart rings out there can’t compete with fitness watches in those stakes – but that’s never been the point of them. Amazfit does say that the ring would work very well if you pair it with one of its smartwatches, and this will be too much hassle and expense for some, but if you’re already in the Amazfit ecosystem, it’ll make a lot of sense.

Overall, the Amazfit Helio Ring is a solid choice for sleep tracking and general wellness monitoring. While it lacks some of the refinement of its more premium rivals, especially in terms of battery life and app experience, it’s a welcome new option in the smart ring space. It'll especially appeal to those already in the Amazfit ecosystem – or anyone looking for a more affordable yet equally capable alternative to some of the best smart rings on the market.

Amazfit Helio Ring review: Price and availability

• Launch price of $299.99 / £269 / AU$399
• Official price now of $199.99 / £169 / AU$269
• No subscription required

The Amazfit Helio Ring originally retailed at $299.99 / £269 / AU$399 in 2024. But now you’ll find it for $199.99 / £169 / AU$269 on the Amazfit website and some regions also stock it on Amazon. For example, you’ll find it on Amazon in the UK right now for a slightly cheaper £149.

How does that stack up against the competition? The Oura Ring 4 starts at $349 / £349 for some designs and colors, but others cost much more. For example, the rose gold version is $499 / £499. Not only is the latest Oura Ring significantly more expensive than the Helio Ring, you’ll also need an Oura Ring Membership to unlock its potential, which is $5.99 / £5.99 a month.

For comparison, the Samsung Galaxy Ring is our top smart ring pick at the moment and that currently costs the most at $399 / £399 / AU$749, but that doesn’t need an additional subscription.

When the Amazfit Helio Ring first launched, some features required an additional payment. Fortunately, Amazfit appears to have removed that model, making the device even more appealing. With no subscription fees, it stands out from Oura.

Whether the Amazfit Helio Ring offers good value depends entirely on what you need from a wearable. At a lower price point than the Oura Ring, and with no must-buy subscription, it’s a solid choice for those focused on sleep and recovery tracking.

If sleep tracking is your top priority, the Helio Ring offers strong value. However, if you’re looking for comprehensive workout tracking, a smartwatch or fitness tracker is likely a better buy. Smart rings, this one included, aren’t designed to replace a sports watch, and the Helio Ring’s limited workout modes prove that. But for those seeking a sleek, comfortable sleep and wellness tracker at a lower cost than the best in the game, it’s a strong contender.

• Value score: 4/5

Amazfit Helio Ring review: Specifications

Amazfit Helio Ring review: Design

• My favorite smart ring in terms of design
• Only three sizes
• Only one finish (but I love it)

The Amazfit Helio Ring is one of my favorite smart rings in terms of design. It’s sleek, lightweight, and comfortable. It has a titanium alloy exterior, giving it a more high-end feel than its price suggests. While the inner side (where the sensors sit) is plastic and comfortable. It’s impressively slim at just 2.6mm and light at 3.65g. This is very similar to the Oura Ring, which is 2.88mm thick and weighs from 3.3g to 5.2g depending on the size. In short, there’s not much in it, so don’t assume affordability means bulkier or heavier.

However, where it does fall short is the Helio Ring comes in only one finish, a brushed silver with tiny dots on the front, which I personally love. The popular matte black options from other brands tend to scratch easily, and gold versions can be too flashy and shiny for me to wear everyday. Of course, this is all down to personal preference, and if you want something that looks different, Oura and Samsung offer more color choices.

Fit-wise, there are just three sizes available (8, 10, and 12), which is far more limited than other smart rings that offer a wider range of sizes. Oura offers 12 different sizes. If one of these fits you, great – but if not, you’re out of luck.

Another big plus is durability. Some smart rings I’ve tested got scuffs within hours, especially those with matte finishes, but the Helio Ring has held up well with only minor scratches after several weeks.

The Amazfit Helio Ring is rated at 10 ATM water resistance, meaning it can handle surface swimming and snorkeling, but not scuba diving. In practical terms, it’s safe for most daily water exposure, including showers, workouts, and casual swims.

A small vertical line on the exterior of the ring marks the sensor placement, which should face the inside of your finger for the best tracking. Unlike some other smart rings, Amazfit makes this clear, which is a nice usability touch.

This is one of the best-designed smart rings I’ve tested. It’s slim and lightweight, subtly stylish, and surprisingly scratch-resistant. The limited sizes and finishes might be a drawback for some, but if the fit works for you, it's a great-looking, comfortable option.

• Design score: 4 / 5

Amazfit Helio Ring review: Features

• Excels at sleep and general wellbeing tracking
• Limited workout tracking
• App is simple but works well

For a more affordable smart ring, the Amazfit Helio Ring packs in plenty of features. Sleep tracking is where this ring shines. You get everything you’d expect, sleep stages, duration, and detailed metrics presented in easy-to-read charts.

But it also monitors breathing, skin temperature, heart rate variability, and resting heart rate while you sleep. All this data is used to generate a morning readiness score, telling you how well you’ve recovered, how much energy you have, and what kind of activity you’re primed for.

There’s also an EDA sensor (electrodermal activity), which, combined with heart rate data, aims to track stress and emotional responses throughout the day.

Unlike fitness watches, smart rings aren’t designed for workouts, and the Helio Ring is no exception. It only offers four workout modes, which is a bit disappointing. But if you mostly run or walk, you’ll still get solid data like workout time, speed, heart rate, VO2 max, calories burned, and GPS-tracked routes.

Amazfit suggests pairing the ring with an Amazfit smartwatch – the idea being that the watch handles workouts, while the ring tracks sleep and recovery. Both sync seamlessly in the Zepp app, making it a well-rounded system if you’re in the Amazfit ecosystem.

There are a couple of other features here worth mentioning, like PAI (Personal Activity Intelligence). This is your unique cardiovascular fitness score based on heart rate and daily activity. At first, it felt like just another number, but PAI actually provides a useful gauge of overall fitness. As someone shifting from a weightlifting and yoga focus to more cardio, I found it surprisingly helpful.

You can also track your menstrual cycle from within the Zepp app, which works similarly to period apps like Flo or Clue, predicting cycles and sending reminders. I didn’t test this, but it’s a solid addition if you want all of your health and fitness data in one place.

With all this data, a good app is crucial. The Zepp app has improved recently and while it’s not as sleek as Oura’s, it’s clean, intuitive, and lets you find key insights quickly. Personally, I prefer a simple interface over something overly designed anyway.

At launch, some features within the app required a Zepp Aura subscription, this is Amazfit’s extra sleep and recovery assistant, this included deeper sleep insights, relaxation tracking, and personalized sleep music. But they’re now all free to Helio Ring users.

• Features score: 4 / 5

Amazfit Helio Ring review: Performance

• Solid at sleep tracking
• Really comfortable to wear
• Won’t replace your fitness tracker

Amazfit claims the Helio Ring lasts up to four days, but in real-world use, I got closer to three-and-a-half days with all health tracking features turned on. That’s noticeably less than the six days you’ll get from the Oura Ring and the seven days from the Samsung Galaxy Ring. Charging is quick, taking about an hour and a half via a USB-C wireless charging plinth.

In terms of comfort, this is one of the most wearable smart rings I’ve tested. The lightweight, slim design makes it easy to forget you’re even wearing it. The size 8 fit perfectly on my index finger, making it feel seamless throughout the day and night. However, with only three sizes available (8, 10, and 12), finding the right fit might be tricky for some. Hopefully, future versions will offer more size options.

Sleep tracking is where the Helio Ring really stands out. It provides a detailed breakdown of sleep stages alongside heart rate and breathing monitoring. The data syncs quickly to the Zepp app, where you can view trends and graphs over time. Compared to other wearables, the sleep tracking felt mostly accurate, though it occasionally overestimated my sleep by a few minutes. One feature I particularly liked was nap tracking, which tends to be hit-or-miss with other devices, but as long as I napped for more than 20 minutes the Helio Ring picked it up accurately.

One of its standout features is how sleep data influences readiness, exertion, and recovery scores, giving you real insights into how well your body has recovered overnight. You can even toggle off certain metrics, like hypopnea (airway obstruction) detection for sleep apnea risk if they’re not relevant to you, which helps conserve battery life.

For me, the recovery tracking was especially useful. Not just physically as I recover from a back injury, but also mentally, after dealing with seasonal depression earlier in the year. If you’re in a similar situation – trying to rebuild fitness or improve sleep – this kind of data can be genuinely helpful. On the other hand, if you’re already in peak shape, I’m not sure these insights would add much value.

When it comes to workout tracking, there are some limitations. Unlike smartwatches or fitness trackers, it doesn’t auto-detect workouts and only supports manual tracking for running, walking, cycling, and treadmill sessions. This was frustrating, as my fitness routine includes a lot of yoga and strength training, neither of which are supported. However, for the workouts it does track, the data is solid. When I took the Helio Ring for a run, I could see everything I needed in the Zepp app, including workout time, average speed, heart rate, VO2 max, calories burned, and GPS-tracked routes.

So while it’s not a dedicated fitness tracker, it does a decent job for running and walking. For more complete sports tracking, pairing it with an Amazfit smartwatch is the best way to get a broader picture of both fitness and recovery.

• Performance: 4 / 5

Scorecard

Should I buy the Amazfit Helio Ring?

Buy it if…

Don’t buy it if…

Amazfit Up: Also consider

How I tested the Amazfit Helio Ring

• Worn 24/7
• Tested for several weeks
• Lots of expertise testing smart rings to compare

I tested the Amazfit Helio Ring for three weeks, pairing it with an iPhone 14 Pro. Aside from taking it off for charging and showers (it’s waterproof, but I was cautious about soap and shampoo), I wore it 24/7 – through outdoor runs, gym sessions, long workdays in coffee shops, evenings at home, and, of course, while sleeping. It’s been put through its paces in a wide range of real-world environments.

As someone who has reviewed numerous wearables over the years, I’ve tested a variety of smart rings – including models from Ultrahuman, Motiv, Ringconn, Evie, multiple generations of the Oura Ring, and more. The smart ring market is only just breaking into the mainstream, but having worn so many, I have a solid sense of what to expect, how they should feel, and what makes a great user experience.

• First reviewed in March 2025

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Xiaomi Smart Band 9 Pro: One-minute review

Chinese tech company Xiaomi is almost single-handedly keeping the cheap fitness tracker market alive, and the new Xiaomi Smart Band 9 Pro is its new entry for people who want to monitor their health on the cheap, but want a nice big screen at the same time.

This health gadget is a follow-up to the Xiaomi Smart Band 9, released in mid-2024, and for all intents and purposes, it’s a very similar fitness tracker – too similar, for reasons we’ll get to. It has the same software, is largely as accurate for measuring your health, and connects to your phone in the exact same way.

Its key selling point is that, unlike its non-Pro predecessor, the Xiaomi Smart Band 9 has a big display. This won me over more than I thought it would – it doesn’t feel much more of a burden on the wrist yet is much easier to press while you’re sprinting down a park path or balancing on a parked bike. I also see it being much more convenient from an accessibility viewpoint, so if fiddly fitness tracker screens put you off, this is the Smart Band to buy.

However with great screens come great price tags and the Smart Band 9 Pro pushes the price up a lot more than its older sibling – it’s not reaching the price point of Garmin’s cheapest options or second-hand Fitbits, but if you’re on the market for something really affordable, its price might give you reason to pause.

Size and cost upgrades aside, the Xiaomi Smart Band 9 Pro ostensibly has some improvements to sleep, blood oxygen, and heart rate monitoring – it didn’t feel that different to me. But I was disappointed in how lots of my issues with the previous band weren’t fixed, namely regarding buggy software.

My experience of using the Smart Band 9 Pro was punctuated by notifications waking me up in the early hours, alerts being hidden by other alerts, and the watch maintaining a very lackadaisical approach in waking when I raised it up. These are all issues I reported in my review of the first band, and they’re back here.

As a tech fan, I wasn’t impressed by how similar the Smart Band 9 Pro is to the Band 9, but the perk of its limited number of upgrades is that it functions just as well as that stellar fitness tracker did. Its activity tracking modes aren’t in-depth but they are handy for workout fans and I found the watch very accurate and useful for tracking distance and heart rate on runs.

When it’s working bug-free, the Band 9 Pro is also a useful lifestyle companion with music control, timers, and notification handling, all features that came in handy during testing.

So the Xiaomi Smart Band 9 Pro is definitely an upgrade over the Band 9 you should consider if the price doesn’t put you off, but you really should ask yourself if you need the bigger display.

Xiaomi Smart Band 9 Pro: Specifications

Xiaomi Smart Band 9 Pro: Price and availability

• Unveiled in October 2024
• Goes for £62.99 / AU$99.99 (roughly $75)
• Matches Smart Band 8 Pro

Xiaomi announced the Smart Band 9 Pro as well as the Active model in late October 2024, initially for its Chinese market, but it slowly released it globally in the following months.

You can pick up the Xiaomi Smart Band 9 Pro for £62.99 / AU$99.99 (roughly $75). That’s a fairly significant price hike, in the UK at least, over the $60 / £24.99 / AU$79.99 ‘standard’ Band 9, though it matches its predecessor the Smart Band 8 Pro.

The price cements the Band 9 Pro as the premium member of its tripartite, with the Band 9 Active coming in at £19.99 / AU$44.99 (roughly $25). The price puts the tracker equal to, or above, some of the best cheap fitness trackers in terms of cost, and I don’t quite feel that the feature set has seen an increase in step with the price hike.

In a few regions, Xiaomi sells extra straps for the Band 9 Pro, and it sent TechRadar one of these alongside the fitness track for testing. However, at the time of writing, these aren’t for sale in the UK.

• Value score: 4/5

Xiaomi Smart Band 9 Pro: Design

• Bigger body than rivals, but not much
• Large 1.74-inch AMOLED screen
• Screen space is really useful

Its suffix is ‘Pro’ but that could well be ‘Gro’ because the Xiaomi Smart Band 9 Pro is, in effect, a bigger version of the non-Pro model in terms of design. That is to say, it’s a standard fitness tracker that’s been scaled up a notch.

The band that comes in the box is made of TPU, and I found it pretty fiddly to clasp but comfortable when worn. It supports a pretty large variance in wrist size, which isn’t something you can say about all fitness trackers. It has an easy-release mechanism so to remove or replace the bands, you simply press a small button on the Smart Band’s body, and I found this easy to do.

You can pick up the band in three color options: black, silver (with a white strap), and rose gold (with a pink strap). As you can see in the images, I used the latter.

The body itself measures 43.3 x 32.5 x 10.8mm, not including the band, and weighs 24.5g. That makes it a little chunkier and portlier than many svelte fitness trackers on the market but its weight wasn’t noticeable on the wrist. In fact, I found it just as comfortable as any other tracker I’ve used.

Next, we come to the screen, the biggest change over the ‘standard’ Band 9 (literally). It measures 1.74 inches diagonally, and like the body, it’s wider and shorter than its sibling. Its resolution is 336 x 480 and the max brightness is 1200 nits, though unlike on the Band 9 I found the automatic brightness wasn’t always that quick. I sometimes struggled to see what I was looking at on my band when outdoors until it had taken a few seconds to adjust the brightness.

This extra screen space will be fantastic for people who don’t get on with the teenie icons of most fitness trackers and smartwatches, and it was especially useful when running so I could easily press a button without needing too much precision.

In terms of protection, the Xiaomi Smart Band 9 Pro has 5ATM water resistance: it can survive at depths of up to 50 meters for 10 minutes. Xiaomi advises you not to take it in heated water, though, like a sauna or in the shower.

• Design score: 4/5

Xiaomi Smart Band 9 Pro: Performance

• Uses phone's GPS but has heart rate and other trackers
• Over 150 fitness tracking modes
• 21-day battery life

In the ‘specs’ section above, I quoted Xiaomi’s estimate for the Smart Band 9 Pro’s battery life of 21 days. However in my testing, I found that the band far exceeded this – it lost a third of its charge in eight days, which included multiple runs (including a three-hour one), several weights training sessions, and sleep tracking on most of the nights. That would put the battery life at closer to 24 days although your mileage will vary.

A 14-day battery life is pretty standard for fitness trackers but 24 days is stellar, so I don’t imagine that the band will let you down. Charging is done with a proprietary charger that plugs into any USB port.

The range of workouts is the same as on the standard band, so there are over 150 fitness tracking modes. Most of these are pretty barebones: they monitor time, your heart rate, and a rough count of the calories burned, so whichever of them you select from the watch largely just dictates how it shows up in your app workout log.

A few of them have more information though, with some like running and cycling using GPS. This isn’t standard GPS but connected GPS, which means the band uses the GPS from your paired smartphone – you can’t go on workouts without your mobile by your side.

This is therefore as accurate as your smartphone, but that’s nothing to turn your nose up at – I ran a distance that was measured to be 5K, and the watch told me I ran 5.05km, which is a 1% error margin.

Sleep tracking is present, and it’s not as in-depth as on a fancy smartwatch: you find out how long you slept, how it’s broken down into deep and light sleep and wake-ups, and what your average heart rate was. According to Xiaomi, the sleep tracking has seen an upgrade in the Band 9 Pro.

Other metrics that are tracked – to dubious levels of reliability – are your stress, energy level, and ‘vitality score’ or cumulative exercise over the last week. The watch also tracks blood rate oxygen and heart rate and these are, according to Xiaomi, also improved over the original band.

• Performance score: 3.5/5

Xiaomi Smart Band 9 Pro: Features

• Mi Fitness app used on phone
• Music playback, notification handling and more
• Some bugs with app and watch

I found the Xiaomi Smart Band 9 Pro quite buggy, which isn’t something that I’m too surprised about given other fitness trackers from the maker that I’ve tested, but it was more pronounced here as some examples disrupted my experience.

Both my most prominent examples come from the band’s otherwise effective notification handling. Sometimes notifications would appear at the same time as, and therefore override more important information; the Pro was very confused when an interval pop-up was immediately succeeded by a message notification, meaning I couldn’t see how many kilometers I’d just hit. And the more annoying one is that, even with do not disturb enabled, notifications would buzz on my wrist in the middle of the night – I was woken multiple times, once at 1 am, by notifications appearing on my wrist.

This latter one is something I experienced with the Band 9, as is another lesser issue: raise-to-wake is unreliable, and sometimes you can lift up your wrist and be met by a black screen.

I shouldn’t compare those two fitness trackers too much, though, because the overall experience of using the Band 9 Pro is great thanks to the larger display. A lot more information can be shown at once using its various widgets: you can see the weather for the next few days, your heart rate on a graph, and a music player to let you pause or skip songs. Buttons overall are naturally a lot bigger, which is a great accessibility win.

Well, most buttons are great, but the exception is in the app drawer which you open by swiping up from the bottom. This is a grid of 26 buttons for different features, and none of them are labeled, so you have to guess which does what. Many of them are identical: two are icons of running people, in different colors, and it’s a real trial-and-error experience. Luckily most of the features that I found myself using can be accessed in other ways, namely by swiping through the home page widgets.

More features come from the tie-in Mi Fitness app, which you download on your phone. It lets you see your fitness and health details in much more detail as well as change your watch face from a huge range of options (including custom photos), see historical data, and set up various features.

• Performance score: 3.5/5

Xiaomi Smart Band 9 Pro: Scorecard

Xiaomi Smart Band 9 Pro: Should I buy?

Buy it if...

Don't buy it if...

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