Noise Luna Ring (Gen 2): One-minute review

The Noise Luna Ring 2 is the second generation of the Luna Ring. I reviewed the original in early 2025 and liked that it felt comfortable, offered solid insights, and was impressively accurate for sleep tracking from a first-gen product.

On paper, the Luna Ring 2 doesn’t sound like a huge leap forward and, visually, you’d be forgiven for not immediately spotting what’s changed. The design tweaks are subtle, and if you already own the first Luna Ring I don’t think this is a must-have upgrade.

But taken on its own, this is a good smart ring. A few pain points have been ironed out. The ring is around 10% slimmer, there’s a new charging case which looks great and stores multiple top-ups, battery performance has improved slightly and the app feels quicker to update. I also felt like sleep tracking was more precise this time round, which is probably due to the improved sensor accuracy.

The main advantage here remains the same as last time round, there’s no subscription here. That immediately makes it more appealing than the Oura Ring 4 (the most popular smart ring) if you’re not keen on adding another subscription to your life, especially if you consider that the Oura Ring 4 is more expensive to begin with.

Personally, the best new feature here is Luna’s circadian alignment tools, presenting guidance about when to get sunlight, drink coffee and exercise throughout the day. It includes a “caffeine window” that tries to stop you sabotaging your sleep with badly timed coffee. These are genuinely useful, presented nicely and feel actionable and meaningful than an arbitrary score.

There are still some things I didn’t like here. The app is pretty information dense and yet again the typography choices feel too small and fussy, which makes daily use less enjoyable than rivals. There’s an AI coach here, but it delivers generic chatbot advice rather than anything helpful. And while battery life here is good, it doesn’t quite make it as long as some rivals.

But the biggest issue here is the market. When I first reviewed the Luna Ring Gen 1, I said one of the main problems wasn’t the ring itself but the competition. That’s even more true now. The Oura Ring 4 still offers the most refined overall experience, the Samsung Galaxy Ring is great as long as you’re not on iOS and the Ultrahuman Ring Air and RingConn 2 Air are strong subscription-free alternatives to both. More and more cheaper alternatives are now entering the market too, like the Amazfit Helio Ring, which isn’t as good but is cheaper.

If you want a capable, subscription-free smart ring with strong sleep tracking and don’t mind that it doesn’t look quite as premium as the big names, the Luna Ring 2 is a good choice. It’s just not the obvious pick and even though I like it I’m not sure there’s anything standout here to recommend it over the competition.

Noise Luna Ring (Gen 2) review: Price and availability

• Price is around $329/£299/AU$510
• No subscription fee
• Several color options at the same price

The Luna Ring 2 is available for around $329/£299/AU$510. I say around as pricing seems to vary across regions and I’m writing this during sale season when prices are fluctuating.

It comes in a range of finishes, including Sunlit Gold, Stardust Silver, Rose Gold, Midnight Black and Lunar Black – that last one is a matte shade. All of these finishes are the same price, which is good as some rivals charge more for specific colors or materials. Then again, that could explain why the Luna Ring 2 has a less premium look and feel than rivals, but I’ll get to that later.

That puts it below the Oura Ring 4, which typically retails for $349/£349 at full price, though more premium materials and colors can push that up to $499/£499. What’s more, you’ll need an ongoing membership to unlock full insights, which is a further $5.99/£5.99. The Samsung Galaxy Ring was also more expensive at launch at $399/£399/around AU$750, though it’s hard to compare given it’s not for iOS users.

Meanwhile, subscription-free rivals include the Ultrahuman Ring Air at £329 (it isn’t available in the US at the time of writing) and RingConn Gen 2 Air at $299/£280/AU$570 (approx). You can also find the Amazfit Helio Ring for £119.90 as a budget option.

All of this means the Luna Ring 2 is more affordable than the Oura Ring 4 but not a budget pick. The lack of subscription does help it seem better value, but it’s not so cheap that it’s a no-brainer over the rest.

• Value score: 3.5 / 5

Noise Luna Ring (Gen 2) review: Specifications

Noise Luna Ring (Gen 2) review: Design

• Light and comfortable
• Slightly slimmer than first Luna Ring
• Can look cheaper than rivals, especially in gold

The Luna Ring (Gen 2) is a light and compact ring, weighing between 3g and 5g depending on the size you need. On paper, that’s a small shift from the Gen 1 ring, and Luna says its Gen 2 ring is 10% slimmer and lighter overall. In reality, the difference is subtle. But the Gen 2 is genuinely very comfortable to wear 24/7.

Sizing runs from 6 to 14 and you get a sizing kit in advance, which works the same way as most smart ring brands. It’s based on standard ring sizes, but I still find that different brands fit slightly differently, so the kit is worth using.

The ring itself is made from titanium with a PVD coating and there’s a non-allergenic and seamless inner surface that sits against your skin. It’s rated 5ATM, which means you don’t need to take it off for showers, swimming or getting caught in the rain. Ideal if you’re trying to build a habit of wearing it constantly.

As for colors, there’s a nice choice here. Stardust Silver, Rose Gold, Sunlit Gold, Midnight Black and Lunar Black, a matte shade. The marketing images make most of them look shiny, and in real life the Sunlit Gold I tested is particularly shiny. Other brands have glossy finishes too, but here it tips over into looking a bit more like a plastic gold ring rather than blending in to look like jewellery, at least to my eye.

The real star of the design in this newer version isn’t the ring itself, but the new charging case that comes with it. Instead of the little charging plinth that came with the Gen 1 version, you now get a compact case that looks more like the cases you get with earbuds, or the Samsung Galaxy Ring. Not only does it pack in lots of extra charges, it’s one of the nicest smart ring charging solutions I’ve used so far.

• Design score: 4 / 5

Noise Luna Ring (Gen 2) review: Features

• Strong core health and sleep data
• Circadian alignment tools genuinely helpful
• AI integration feels gimmicky

The Luna Ring (Gen 2) follows the familiar smart ring formula, lots of sensors in a tiny band. You get green and red LEDs for heart rate, blood oxygen and skin temperature tracking, photodiodes and a 3-axis accelerometer for movement.

From those, Luna tracks your sleep time, sleep stages and sleep score, resting heart rate and heart rate variability (HRV), respiratory rate and SpO2, temperature fluctuations, stress, activity and menstrual and ovulation tracking, based on temperature and HRV.

There’s automatic detection for walking and running, plus basic workout logging for other exercises. Though, as with most smart rings right now, this isn’t designed to replace a full-on running or fitness watch, but it works well for general movement.

It’s worth noting there’s no VO2 max estimate here, which you’ll find on some rival rings and many of the best smartwatches. If you like that training metric, you might miss it here.

The more interesting additions on the software side are Luna’s “Life OS” platform, which has been updated in this version. It brings new tools like the aforementioned circadian alignment guide and a “caffeine window”. These suggest the best times to get sunlight, eat, exercise and drink coffee based on your patterns, with the aim of nudging you into a more consistent rhythm and protecting sleep.

I found those features genuinely useful and really nicely presented. Even if they don’t transform your sleep overnight, they did gently encourage me to think about my day in a way that’s more aligned with my sleep and rhythms.

There’s also an AI coach here, but I found it quite gimmicky (like most AI integrations these days). It’s essentially a chatbot bolted onto your health data. Now, some people might enjoy asking it questions, but in my testing the nutrition and lifestyle advice felt generic. Responses could be slow and if you already know the basics of health and fitness you might find it a little condescending.

On the integration front, the Luna Ring currently works with Apple Health and Google Fit, which at least lets you pull workouts from other platforms. But there are no deeper third-party integrations yet, so you can’t plug it directly into more specialized training apps or health dashboards, for example.

• Features score: 3.5 / 5

Noise Luna Ring (Gen 2) review: Performance

• Sleep tracking feels upgraded
• Battery life is good, not class-leading
• Good app but a bit cramped

Let’s start with the battery, as that’s been updated over the previous version. Noise says you’ll get between 4 to 7 days, which is quite a broad amount of time. During my testing I consistently got just under 6 days out of it, which I think is good. It’s an improvement over the first ring, which only ever reached 4 days.

The charging case can store around 30 days of power before you need to plug it in, which was really handy. Especially considering the charging case is light, small and looks nice.

For content, the Oura Ring 4 and Ultrahuman Ring Air can deliver six to eight days, while the RingConn Gen 2 Air can stretch to 10 to 12 days. So Luna sits in the good but not outstanding bracket where battery is concerned. Good thing it’s got the charging case this time around, which helps – did I mention I love the charging case?

The Luna Ring (Gen 2) will automatically detect walking and running and in my experience it did this reliably. You’re prompted to confirm detected sessions, which is handy.

For other exercise types, you’ll need to log activities manually and there are lots to choose from, including yoga, treadmill, cycling, bouldering, pilates, even surfing. As with most smart rings, it’s not a hardcore training tool, there’s no GPS or dedicated workout models. Think of it more as an everyday health tracker that handles simple workouts reasonably well rather than something you’d use for serious training.

I have mixed feelings about the Luna app. On the plus side, it’s packed with information and you can dig deeper into information about sleep, readiness, activity, temperature and more. In some places, scores are accompanied by short explanations, which I always appreciate more than a bare number.

However, the presentation of the data still doesn’t quite land for me. Fonts are tiny and a lot of elements are tightly packed together. It’s a subjective complaint, sure, but one that does impact on my day to day enjoyment of using it.

Some of the language and flagging around health data also feels more alarming than it needs to be. For example, waking up to a red exclamation mark on my SpO2 with a blunt “Pay Attention” message isn’t in line with how I think wearables should be talking to us about health. The same goes for some of the coaching prompts, they’re technically accurate, but not particularly warm or human.

Sleep tracking is where the Gen 2 shines, it does a great job at picking up on sleep and wake times, even on nights when my sleep was broken. I often wake up around 3am, read for a few hours, then go back to sleep. The Luna Ring 2 picked up this pattern consistently, where in the past other wearables have not detected the break or not detected me falling back to sleep again. It also detected short naps accurately.

You get a full breakdown of your sleep stages, a nightly sleep score and insights into what’s pushing that score up or down. Over time, trends are handy to see.

As for whether those circadian tools I mentioned earlier improve my sleep, that’s hard to say definitively, but having prompts about when to get outside, drink coffee or exercise did make me more intentional about my routine.

Finally, there’s the AI coach. I know other reviewers enjoy this kind of feature, but here it still feels like a very basic chatbot sat on top of your data rather than anything geared to personalized guidance. Generic nutrition tips, slow responses and a lack of nuance mean it’s not something I enjoyed using.

Though I will say one of the suggested prompts was “Which health metric needs my attention today?” which does highlight anything noticeable without digging around. Without that I’d say it was a bit useless.

• Performance: 4 / 5

Scorecard

Should I buy the Noise Luna Ring (Gen 2)?

Buy it if…

Don’t buy it if…

Noise Luna Ring (Gen 1): Also consider

How I tested the Noise Luna Ring (Gen 2)

• Paired with an iPhone 16 Pro
• Wore the ring 24/7
• I’ve been testing wearables for 12+ years

I tested the Noise Luna Ring 2 for several weeks, paired with an iPhone 16 Pro. I wore it all day and night, including running outdoors, to gym sessions, during long workdays in coffee shops, evenings at home and, of course, while sleeping. I only took it off to charge it or when showering – yes, it’s waterproof but I never like to risk soap or shampoo messing it up.

Over the past 12 years I’ve reviewed dozens of wearables, including smart watches, fitness trackers and smart rings from Oura, Ultrahuman, RingConn, Motiv, and more. Having got hands-on with so many, I’ve got a strong sense now of what makes a smart ring comfortable, truly useful – from design and comfort to performance, app quality, and long-term wearability – and standout in a busy and competitive space.

• First reviewed in November 2025

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