• View or buy at Narwal

Narwal Freo Z Ultra Robot Vacuum and Mop two-minute review

Launched to great acclaim at Europe’s biggest tech show, IFA (where it snagged two awards), the Narwal Freo Z Ultra is a successor to the brand's Freo X Ultra. Significant upgrades include dual RGB cameras, LiDAR navigation, and an increase in suction power from 8,200 to 12,000Pa. In layman’s terms, it’s better at obstacle avoidance and adaptive cleaning, plus it sucks up more dirt!

In my tests, I found the Z Ultra excelled at both mopping and vacuuming on hard floors (of which I have many) but it was less cool on carpet. To be fair, I’ve tested some of the very best robot vacuums and am yet to find one that can handle dusty carpets as well as the best manual vacuums for carpet, which always have more power and better filters.

I loved all the smart automation, which meant I didn’t have to zone off carpets to stop them getting soggy or worry about what power level or speed to set. As a germophobe I also really appreciated how hygienic this robot is; cleaning and drying itself after every session.

Its mapping powers were also great, but I would have liked a quick option for spot cleans. Many robots allow you to mark a zone on the map where there’s a spill and send the robot straight there to clean. The only way I could work out to do this was in video mode, where you can manually navigate the vacuum. The issue here was the video was glitchy about connecting and often flatly refused – not ideal if you have spilt something that could stain and needs speedy attention.

I also had a few bin-related issues, and mopping was deadly s-l-o-w, but absolutely worth the wait. Ideal for large homes with mostly hard surfaces, the Narwal Freo Z Ultra suits tech-savvy homeowners who appreciate an integrated app and can get their head around fine-tuning settings. Technophobes and the impatient (and anyone on a budget) might prefer to steer clear.

Read on for my full Narwal Freo Z Ultra Robot Vacuum and Mop review.

Narwal Freo Z Ultra review: price & availability

• List price: $1499.99 / AU$2,499
• Launch date: October 2024
• Availability: US / AU

The Narwal Freo Z Ultra launched in October 2024 and at time of writing is available to buy in the US and Australia, with a list price of $1,499.99 or AU$2,499. That places it firmly in the premium price bracket. There’s no getting away from it, the Narwal Freo Z Ultra is a pricey robot vacuum sitting at the very top of the market in both Australia and North America. You can save a few dollars by waiting for seasonal sales (the Black Friday deals often include some big robovac price-drops).

There are two accessories pack options. Option 1 will set you back an extra $259.99, and costs of a whole raft of brushes, detergents, dust bags and mop pads. Option 2 gets you a few of the most-used accessories, for $100. You can also add a one-year extended warranty plan for $79. Buying the accessories individually will soon add up – a replacement detergent is $29.99 – so it’s worth doing the math before you decide which option to start with.

While the Narwal Freo Z Ultra is an investment appliance, it will save you a LOT of time and it’s by far the best mopping robot I’ve tested. I wouldn’t buy it purely for vacuuming, but as a combo, it might be worth the spends.

• Value for money score: 3.5 out of 5

Narwal Freo Z Ultra Robot Vacuum and Mop specs

Narwal Freo Z Ultra Robot Vacuum and Mop review: design

• Stylish robot with mopping and vacuuming skills
• Large mop heads and spinning brushes for getting close to edges
• Decent capacity water reservoirs

Arriving in a huge box, I needed an extra pair of hands to unload the Z Ultra and was grateful for the hand grips in the base station when positioning the heavy unit next to a power point. It comes with a simple instruction card for first-time setup, as well as a more comprehensive user manual. I used the former to install the side brushes, insert the detergent and add clean water. My daughter got a lot of satisfaction from removing a gazillion instructional stickers from both the base station and vacuum unit.

The design of the Freo Z Ultra, and base station, is very stylish indeed, which is just as well given that it’s hard to hide! Choose from Galaxy White or Space Gray. All the edges are softly curved and, with its two camera ‘eyes’ in the front, has the cute vibes of Pixar’s Wall-E, which is exactly how I like my robot vacuums. The various lids and covers pop off without breaking any fingernails, and everything is easy to access.

Underneath, this robot has two large microfibre style mops that Velcro on, as well as two rotating side brushes that are a good length for getting into corners. The main roller brush has a rubber flipper part as well as brushes to suit both hard floors and carpets, plus its anti-hair tangle design does actually work. As I have two daughters and two spaniels who seem to molt year-round, I was delighted to swerve the odious task of cutting swathes of hair from around a roller. (Effective anti-hair wrap brushrolls are a key feature amongst the best robot vacuums for pet hair.)

One unusual feature I’ve not seen anywhere else is a fluffy baseboard duster that attaches with Velcro on one side and is designed to gather dust from the tops of your skirting boards as it goes along the edges of the room

The Narwal Freo Z Ultra’s base station has two large containers for clean and dirty water. These are are easy to lift in and out, but you'll want to make sure the dirty water reservoir’s lid is properly clipped on, or you may have to clean up a mini flood.

There’s also a dust collection bag and compartment into which to slot the bottle of floor cleaning solution that’s supplied. The bot does work without the detergent module in place, which is handy given they cost nearly $30 a pop. There’s a cool little window strip in the base that shows the water being ionized. It’s not clear why the water needs to be ionized but if you like watching bubbling water, take a peek.

• Design score: 4 out of 5

Narwal Freo Z Ultra Robot Vacuum and Mop review: performance

• Amazing at obstacle avoiding and navigation
• Great at mopping, poor on carpet
• Self-cleaning is great, but self-emptying hit and miss

The first job any robot vacuum has to complete is a map of the house, which this little beauty did in 17 minutes – impressive given we have quite a few little rooms, and many obstacles. (Here's more on how to prepare your house for a robot vacuum, if you're unsure.)

The mapping was precise and accurate. I liked how the map shows where the rugs and carpets are; often you have to add your own, which requires some guesswork on precise positioning. I’ll discuss the App in more depth later, but it was easy to name each room and set up no-go zones and divide rooms. Another bonus of the Freo Z Ultra is the ability to choose from a wide menu that covers mop, vacuum, mop & vacuum, and mop then vacuum. Some models I’ve tested don’t allow you to just mop.

Once I’d got to grip with the controls, I loaded up the water tank and tasked the Freo Z Ultra to vacuum and mop my entire ground floor, which is mostly engineered wood, with some terracotta, porcelain, luxury vinyl and of course rugs and carpet. Pretty diverse then.

While it was possible to set my own cleaning parameters, the Freo Z Ultra has an AI mode that uses various sensors and cameras to automatically adapt to different floor types and dirt levels. This takes the brainwork out of setting up and ended up being my go-to mode throughout my three-week trial period.

The first thing I noticed was how good the Freo Z Ultra was at obstacle avoidance – no banging into furniture or corners and no dragging cables or dog toys around the floor with it. (TechRadar's article on how robot vacuums navigate walks through the typical approaches brands use.) I never once got a message to say the roller brush was stuck, which is the usual warning that a robot has eaten something it shouldn’t! It was also excellent at powering over thresholds and the annoying chair legs I have that robot vacuums usually get grounded on, and spin like mad until sending a stuck error message.

The second thing I noticed was how it doesn’t get terribly close to the edges in mopping mode. When vacuuming, I could see the little spidery side brushes pulling dog hair and dander in from the edge but in mop mode there was a clear inch or more of bone-dry flooring around the perimeter of the room and any floor-level furniture like our kitchen units and sideboard.

And on the subject of edges, I’m sorry but the little fluffy baseboard duster on the side of the robot is only going to work if you have super low baseboards. Like many heritage properties, the baseboards in our Victorian home are quite high so it doesn’t reach the tops, aka the only bits that need dusting.

The Freo Z Ultra doesn’t carry any water onboard, which is unusual. Instead, it loads its mops up with warm, soapy water at the base station before heading out to clean. I was concerned this would result in dry patches of flooring, but the dampness levels were perfect – not too wet (important on real timber flooring), nor too dry.

The only downside is it has to make repeat returns to load up with more water, which can elongate the cleaning time, especially in rooms that are furthest from the base. For example, it took 1hr 19mins to mop our utility and hallway, which is an area of just 40 sq m. To vacuum and mop the whole ground floor, 68.3sq m, the Freo Z Ultra took a tedious 2h 41mins. Imagine how long it would take if I asked it to vacuum and then mop, rather than do it consecutively. I didn’t want to find out! I’ve never tested a robot that spends longer than two hours on the job.

When the robot returns to base after mopping and vacuuming, it automatically empties the bin and cleans its mop heads and then dries them. The latter takes a couple of hours but it’s incredibly quiet, so you won’t notice it. I did have to set the bin emptying to every run on the app, otherwise it clogged up and couldn’t self-empty itself. Hardly surprising given how microscopic the onboard bin is. Even then, there were a few times the bin just wasn’t self-emptying, even though it said it was, which was frustrating.

There are a handful of extra features – perhaps the most interesting one being that in Video mode you can see through your robot’s 'eyes' and remote control it around your home. That means you can use it as a security bot, or to check up on pets and send it off to specific locations. This mode isn't authorized by default, you'll need to manually switch it on if you want to use it.

Cleaning tests

When it came to running our standard vacuuming tests – one using a fine mix of biscuit and flour, and another using oats to represent larger particles – the results were a mixed bag. The Freo Z Ultra did well on the hard floors, eventually anyway. It took at least three passes and full power mode to get everything up.

I used multiple ‘no-go’ zones on the map to create my 1m x 1m test area, but the robot still seemed to spend far longer cleaning around the area I had made my test spills than it did actually dealing with the mess. This led me to seriously question Narwal’s claims that it homes in on and targets dirt using its beady little cameras and sensors.

With oats on carpet, the results were middling. The robot pushed things around a fair bit and it took three runs before they were gone. The dog may have helped!

On carpet, the fine mix removal was very disappointing. I gave up after three attempts and got my cordless vacuum out. Although this isn't great news, I'd argue that it's not often you'll experience this level of concentrated 'dust' and I was always happy with its carpet cleaning results in general.

Next, I tried out the mop function by 'spilling' first Ribena juice and then ketchup, which I left to dry, on the porcelain tiles in our cloakroom (I didn’t want to risk stains on our timber floors). These results were much better, although the dried-on ketchup required two passes to complete the job. According to Narwal, this impressive mopping is achieved via dual rotating mop heads that press down with 1.2kg of force and spin at 180 RPM. Other robot mops I’ve used either just drag a static mop pad along, or have a vibrating mop, this spinning tech is the closest I’ve come to mimicking real mop work. And the results show it.

Apparently, this robot also analyses the waste water to decide if another cleaning run is required but I had to make that decision myself with the ketchup; the Freo Z Ultra thought it was done after one attempt.

To check navigational skills, our final test involves placing a sock (in a similar shade to the flooring) a shoe and a charger cable on the floor. The Freo Z Ultra absolutely nailed this test, not touching any of the objects but getting close enough to clean sufficiently around them.

The Freo Z Ultra takes around 2.5 hours to charge, which is a bit speedier than normal, and has a run time of just over 2 hours 15mins (in vacuum and mop mode), which is about the standard for a high-end robot. It automatically returns to the base to charge if it runs low on juice during a cleaning cycle, which is also the norm. If I was asking it to do the whole house, it never managed on a single charge but I usually tackle the dirtiest rooms (kitchen and hallway) more frequently and that was easily done without the need to stop to recharge.

Noise-wise, I am quite noise intolerant and as I work from home, I don’t like having noisy robots rattling around the house while I am trying to focus. Happily, I found the Freo Z Ultra one of the quietest robots I’ve tested, especially in mopping mode, with my decibel meter App recording between 60-70dB max. This is way below the noise levels you would get from a regular vacuum, but if they still bother you, just schedule the robot to work while you’re out of the house.

Maintenance

I found the Freo Z Ultra easy to clean and maintain, the internal bin pops out for emptying, if it hasn’t emptied automatically into the base station, and the mop heads are automatically washed with hot water and dried after every use. This is important to prevent bacteria breeding in the mop heads and before being dragged all over your home. All this self-cleaning did mean it rattled through the clean water in the tank and I had to refill it before most cleaning runs, but that’s a small price to pay I’d argue.

Like all robot vacuums, it’s important to keep the sensors and charging contacts clean, which is an easy wipe-over task. The roller brush didn’t clog in the three-week test period, but if they had, they do clip out very easily. I also didn’t fill the dust bag in the base station but it just clips out and pops straight in the bin when full.

Narwal recommends cleaning the filter once a week, which involves clipping it out from under the top cover on the robot and tapping out the dust – simple. It should be replaced every three-six months.

• Performance score: 3.5 out of 5

Narwal Freo Z Ultra Robot Vacuum and Mop review: app

• Very easy to work out without assistance
• Lots of options to customize cleaning (or not)
• Mildly glitchy connection

The Narwal Freo Z Ultra app is user-friendly and intuitive (I never needed to use the Help Center), making it easy to create custom cleaning schedules, adjust settings, and monitor cleaning progress in Real Life. Make sure you connect using a 2.5GHz wi-fi link, not 5GHz.

If you love an easy life (as I do), you can clean in Freo Mind mode, which leaves all the decisions about power levels, patterns and passes to the robot. If you’re a control freak, each cleaning program comes with various adjustment options, such as mopping humidity, coverage precision, detergent use etc.

You can choose which rooms to clean, but I also liked that I could set the cleaning sequence for a full home clean. For example, I set it to start in the kitchen, then hallway, then dining room (where my desk is), so that it gets those rooms I spend most time in done first (while I’m taking the kids to school). You can also split rooms, merge rooms and add no-go zones.

The app also provides cleaning history and notifications to ensure you stay informed of cleaning progress. I did experience quite a lot of delays between opening the app and the robot syncing, but we’re only talking seconds. And it often annoyed me that there was no Spot Clean option but that may well come with a software upgrade.

• App score: 4 out of 5

Should you buy the Narwal Freo Z Ultra Robot Vacuum and Mop?

Buy it if…

Don't buy it if…

How I tested the Narwal Freo Z Ultra Robot Vacuum and Mop

I tested the Narwal Freo Z Ultra Robot Vacuum and Mop for three weeks on the ground floor of my four-bed historic home. With the exception of thick-pile carpet, we have all manner of flooring types from porcelain and terracotta tiles to vinyl and engineered oak. I ran the robot in various rooms, in every cleaning mode, every day and tried cleaning in both automatic smart mode and fully customized. I also set schedules and conducted controlled tests where I had the robot vacuum flour, crushed biscuits and oats from hard floors and rugs, as well as mop wet and dried on spills from the porcelain tiled floor.

Read more about how we test

First reviewed November 2024

Roborock Qrevo Slim: two-minute review

Although sporting a lower-profile design than some rivals, the Roborock Qrevo Slim is otherwise a full-size robotic vacuum and mop that is powerful, intelligent and packed with features. The redesigned LiDAR system means it can slide more easily under low furniture, getting to floorspace that other robots can't, without any noticeable compromise in navigation performance.

The well-appointed Roborock app serves up no fewer than five suction levels, plus configurability for the cleaning route and mopping performance. It also smartly raises its dual spinning mops when carpet is detected, and features a spinning side brush that pivots outwards to reach into the corners of every room.

With up to 11,000Pa of suction power, the Qrevo Slim is more powerful than many rivals, including the pricier Eufy Omni S1 Pro, and you can even view a live stream from the front-facing camera in the Roborock app, turning the vacuum cleaner into a pet monitor.

The Slim does not feature the bouncy 'AdaptiLift Chassis' found on the Roborock Qrevo Curv, which launched alongside the Slim in September 2024. However, perhaps thanks to the improved navigation system, the Slim robot itself still tackles thick rugs and raised door thresholds with a confidence missing from most rivals. It's also worth noting that despite the low profile, this is still a relatively large robot, with an equally large docking station, so it's best-suited to medium and larger homes. That's the short version; read on for my full Roborock Qrevo Slim review.

Roborock Qrevo Slim review: price & availability

• List price: $1,399
• Launched: September 2024
• Availability: US

The Qrevo Slim launched in September 2024 and sits in the premium price bracket. It comes with a list price of $1,399, but you might be able to avoid paying that – I've spotted it discounted to around $999. At time of writing (because this market moves fast!) it sits at the top of Roborock's Qrevo range at, which itself occupies the middle tier of the company's robotic vacuum offering.

Below it you'll find the budget Q Series, and above you'll find the flagship S Series family, where prices start just below the Qrevo Slim (you'll pay $1,300 for the S7 Max Ultra), and extend all the way up to the range-topping, $1,800 S8 MaxV Ultra.

A four-figure vacuum may sound expensive, but that $1,300 buys you a lot of smart technology, and in this case your money goes into an interpretation of LiDAR known as 'StarSight', which is unique among robot vacuums, and is responsible for the Qrevo Slim's reduced height. You also get very high suction power – and in fact, at 11,000Pa, the Slim is more powerful than even Roborock's flagship S Series, which peaks at 10,000Pa. For comparison with other brands, the equally expensive Eufy Omni S1 Pro is rated at just 8,000Pa.

There is no ongoing subscription cost for the Qrevo Slim, although you'll need to purchase replacement dust bags every couple of months (Roborock says they get full in about seven weeks), and the side brush and mopping pads will eventually need replacing too.

• Value for money score: 4 out of 5

Roborock Qrevo Slim specs

Roborock Qrevo Slim review: design

• Low-profile design fits under furniture
• Self-cleaning and emptying charge dock
• Dual rotating mop pads

The ‘slim' part of this robot's name refers to how it doesn't have a spinning LiDAR sensor on top. This makes it shorter than most rivals, and at 8.2 cm tall it can drive places other robotic vacuums cannot. Roborock has replaced the conventional LiDAR sensor with a system it calls StarSight. This includes a dual-light, solid-state LiDAR system, plus a 3D time-of-flight sensor, a camera and infrared sensors. (Head to TechRadar's article on how robot vacuums navigate for a deep-dive into this area.)

The rest of the Qrevo Slim's design is similar to other self-cleaning robovacs in the Roborock range. The robot is circular, with dual spinning mops at the rear (this style of mop is typically better at scrubbing than the fixed, D-Shaped pad style), a rotating brush at the side that cleverly extends to reach into corners, and a pair of rotating rubber brushes underneath. The charge dock has a dust bin and a pair of water tanks – one clean and one dirty – to work with the robot's mopping function.

The robot itself measures 350mm (13.8in) wide, 353mm (13.9in) deep and 82mm (3.23in) tall, while the dock is 340mm (13.4in) wide, 487mm (19.2in) deep (including a ramp the robot parks on) and 521mm (20.5in) tall, although you'll need to leave space for the water tanks, which are removed by lifting them upwards from the dock.

Roborock also sells the Qrevo Slim with a refill-and-drainage system. This works in the same way, but plumbs into your home's water supply, so can refill and drain the mopping water tanks automatically. This dock is the same width and depth, but is shorter, at 405 mm (15.9in). For this review we're looking at the regular model with the larger, manually-refilled and emptied water tanks.

As with other such robots, the Qrevo Slim dock charges the robot's battery and empties its dust bin into a larger bag that Roborock says only needs changing every seven weeks, although that will vary depending on what you're asking it to pick up. The robot also has its mopping pads cleaned with warm water and dried during charging, while the onboard water tank is emptied into the dock.

Back to the robot itself, and the Qrevo Slim can automatically lift and lower its mops, depending on the floor surface and what cleaning task is required. The side brush and one of the spinning mops can also move outwards, touching the walls and skirting boards for a complete clean.

There are three buttons on the top of the robot for quick access to key functions, like powering up, pausing and sending it back to its dock. Removing the magnetic cover gives access to the dust bin and filter, which can then be removed and cleaned or replaced.

The robot and dock take up a fair bit of space, and it's recommended that you place the dock against a wall, but with enough space either side for the robot to drive into, ensuring it cleans every last bit of your floor. You don't have to do this though, and you can sit the dock in a corner if needed; just make sure the ramp is clear for the robot to drive onto.

• Design score: 4.5 out of 5

Roborock Qrevo Slim review: performance

• Handles thick rugs and raised thresholds with ease
• Automatic switching between vacuum and mop
• Cleans deeply and reliably

Right away, I want to highlight how good the Roborock Qrevo Slim is at driving through thick rugs and over raised doorway thresholds. These are both tasks other robotic vacuums can really struggle with, and even flagship models with four-figure price tags have failed to clamber their way from my exposed-floorboard hallway into the carpeted bedroom.

Not the Qrevo Slim though. It drove over every threshold, every time. It even managed to wade its way through a thick rug in the lounge – something no other robot has achieved reliably – during its first exploratory drive. During that drive it used its camera and imaging sensor to create a map of my flat, which it automatically split into labeled rooms. It got most of the labelling correct, but I still had to jump into the app and make a few edits before saving the map.

Its off-roading abilities meant I could leave the Qrevo Slim to get on with its job, safe in the knowledge that it would drive into every room, clear the rug (and automatically vacuum it, too) and return to base without me checking if it had got trapped. On a couple of occasions, it briefly got stuck on a raised threshold, but always managed to clear it by reversing and driving forward again at a higher speed.

The automatic mode selection also impressed me. Since it's so often a challenge for robotic vacuums, I usually roll the rug up and set a robot to mop and vacuum the wooden floor. But with the Roborock I left it to do its own thing, where it vacuumed and mopped the wooden floor, then automatically raised its mop to vacuum the rug, before lowering it again to continue mopping the floor and ensuring the rug stayed dry.

As well as recognizing the difference between floor types, and where each room ends, the robot can also spot common household items like beds, sofa and television stands, which it then adds to the map.

On test, the Qrevo Slim's navigation was usually very good, driving confidently into small gaps, not crashing into anything at speed and not getting stuck. But on one occasion it got confused and failed to find its way back to the dock. Understandable if it was stuck under the sofa, or somewhere else far from the charging station, but it was just a foot or so from the dock, yet after lots of spinning around it declared defeat via an app notification. I don't know what caused this, but it only happened once during several weeks of testing.

Onto the specific cleaning tests. I begin by scattering a mix of oats and flour across approximately one square meter of wooden kitchen floor. I began in the quietest, least powerful vacuuming mode, with the robot driving a standard pattern and completing the route only once.

At just 60 dB, Quiet mode really is very quiet indeed, with the vacuuming itself no louder than the motors driving the robot around. As expected, this mode didn't do a particularly good job at picking up debris. It's okay for dust (or flour in this case) but struggled with the oat mix. Just like most other robotic vacuums, the Qrevo Slim's rotating side brush tends to flick debris around the room, and out of the robot's path. Telling it to perform the route twice mostly fixes this, as the flicked debris will be collected on the second pass.

Turning the vacuum power up to Balanced (one level up from Quiet) and telling the robot to clean the same area twice made a big difference. Despite only being slightly louder (about 63 dB), this setting sucked up almost all of the oat mix, with just a few pieces flicked out of reach by the side brush. Turbo mode is the next step, but at 65 dB it's only slightly louder than Balanced, but clearly has more power and was able to pick up all of the flour and almost every piece of oat.

Max vacuum strength is noticeably louder, at 69 dB. This is when the Qrevo Slim starts to really sound like a vacuum cleaner, but it's still the sort of volume you can talk over with a slightly raised voice. The cleaning power is also ramped up, providing an excellent clean.

However, on this run I noticed how when you create a zone for the robot to vacuum, it won't go right to the edges of a room, even if the zone you create overlaps the walls of the room map. This means you'll be left with a line of debris – in this case flour – swept to within a few inches of the wall but not collected. This is despite me telling the robot to clean right up to the wall. It also frequently failed to clean up directly in front of its docking station. Telling it to clean the whole room fixed this.

Finally, it's time for Max+, which even comes with a warning that it will shorten battery life due to being so power-intensive. This mode peaked at 70 dB and did a great job of collecting the debris, but the routing still meant some oats were flicked across the room and left behind; I also spotted how the robot drove over some flour without the vacuum on, then left a line of white tire tracks that it failed to pick up on subsequent passes. Requesting another clean, on a lower power setting, addressed this.

To summarize, cleaning whole rooms twice using Turbo or Max mode is best in most cases.

I then repeated these tests on carpet, and saw very similar results. The Quiet and Balanced modes are fine for a little-and-often approach, but failed to pick up all debris. Turbo and Max modes performed better, while Max+ feels like overkill for regular cleaning, but is still a nice-to-have. If I'd just moved into a new home, I'd be using the full 11,000 Pa of suction with Max+ in every room to start with, then switch to Routine or Turbo for scheduled cleaning.

Turbo mode is the best all-rounder, mixing an ability to suck flour out of a reasonably dense carpet, with a low volume level. I still wish the robot was better at collecting debris flicked around by the rotating brush, but this is only apparent when faced with very specific tests. You won't notice this during regular cleaning, but might need to occasionally pick up a few bits of debris with a handheld vacuum.

Finally, the mop. The Qrevo Slim has a pair of mops that spin at 200 rpm and push downwards for a deep clean. There are three preset water flow options (low, medium and high), plus a custom option where you can pick from a flow rate between one and 30. You can then tell the mop to clean an area once or twice, and pick from four route options, ranging from the quickest, through to Deep+, which is more thorough but takes much longer.

For my test I scattered some hot sauce across the wooden kitchen floor, left it to partially dry, then set the Roborock to work. I asked it to mop the entire room, using a moderate water flow (number 20 of 30), with two cleaning passes, and the Standard route option. In short, it did a great job. The right-hand rotating mop extends outwards, so that it can clean right up against the walls or skirting boards on an initial lap of the room, before tucking back into its default position and working together with the left-hand mop to give the entire floor a thorough wipe.

All of the hot sauce was removed, but only because I set the robot to make two passes; some stains were still visible after the first pass.

The side brush spins slowly during mopping, so it's best to use the mop on a dried stain instead of a fresh spill, as any liquid will be wiped by the brush and require manual cleaning later. It's also worth remembering that the mop uses only warm water and no detergent. (You can find premium robot vacuums that offer hot water mopping, although it's rare – the option to add detergent is more common and is included on other Roborocks, including the S8 MaxV Ultra).

The mopping process is all very quiet, ranging from 44 bB to 58 dB as the water tank is filled from the docking station, then emptied again, and the mop is cleaned using hot water and dried with warm air. The mop takes three hours to fully dry, but during that time you can ask the robot to either mop again, or do some vacuuming. The dock base (the part the robot sits on while charging) self-cleans with a pair of rotating scrapers, but can also be removed for a manual scrub. After several weeks of testing, the base still appeared as-new.

There's even a sensor in the charge station that checks how clean the robot's water is, then cleans the mops more thoroughly if required.

Lastly, the robot has a voice control system that responds to the command 'Hello Rocky'. It can be asked to 'vacuum the bedroom', 'mop the kitchen' or 'dry the mop', for example. The robot responds quickly and accurately, making voice commands a convenient way to access basic functions without finding your phone and diving into the app for more granular control.

The Qrevo Slim's battery life is a claimed 180 minutes. This feels fairly accurate, but will vary considerably depending on which settings are used.

• Performance score: 4.5 out of 5

Roborock Qrevo Slim review: app

• Easy to use, but…
• Lots of customization on offer. Almost overkill
• SmartPlan and homescreen widgets are handy one-tap solutions

The Roborock app works like most other robotic vacuum controllers. There are several customizable cleaning parameters to adjust, including five levels of suction power, three levels of water flow for the mopping function, and the option to clean an area once or twice, plus an option to pick between the standard or faster, more efficient cleaning route. Or, it can be set to only vacuum or mop a certain room or area, depending on your needs.

There's also the SmartPlan, which uses artificial intelligence to learn your cleaning habits and preferences, then creates a customized vacuuming and mopping plan.

On top of all that are the routines. If you don't want to clean the whole map, or a single room, you can instead select the After Meals routine, which can be configured to clean only the kitchen and dining room, for example. Routines appear on the home screen of the app, and can be activated with just one tap. iPhone users can create a homescreen widget with one-tap access to a couple of your most-used routines. With that set up, it's a case of unlocking your phone and tapping once on the widget to start a cleaning routine.

There are even a few pet-friendly app features, including a function where the robot will go and look for your pet without the vacuum running, using its forward-facing camera to show a live stream of what's going on.

As with other robotic vacuum apps, there are options to reconfigure your map and rename rooms. There are also masses of settings to adjust, if you wish, from cleaning schedules, to how the robot uses its lifting mops, what temperature water it uses to clean the mops, how often it empties its dust bin, and much more.

These can almost all be left to their default setting, but I strongly urge pet owners to enable pet mode in the Reactive Obstacle Avoidance page of the settings menu, since this ensures the robot recognizes and avoids pets and their waste with extra precision.

• App score: 4.5 out of 5

Should you buy the Roborock Qrevo Slim?

Buy it if...

Don't buy it if...

How I tested the Roborock Qrevo Slim

I set up the Qrevo Slim and used it as my only vacuum cleaner for several weeks. After using it for general vacuuming and mopping duties, I performed a series of tests to appraise its cleaning abilities, as well as its noise levels and how well Roborock's smartphone app works.

Read more about how we test robot vacuum cleaners

• First reviewed November 2024