The best robot vacuums in 2021


  • A good robot vacuum should clean floors without much work on your end, clearing up dirt and dust with just a push of a button. 
  • I personally tested 16 robot vacuums and consulted three experts to determine the best robot vacuums for different needs and budgets.
  • The Roborock S6 Robot Vacuum is the best robot vac for most people because it works well on hardwood, carpeting, and in corners; features mopping and home security capabilities; and has a helpful app.

A robot vacuum can remove the small but time-consuming task of vacuuming from your never-ending to-do list. However, you'll want one that's powerful, relatively quiet, and doesn't require constant attention. 

That's why I've tested 16 robot vacuums to find the best ones and consulted health experts and engineers on how to use them properly. A robot vac needs maintenance like any other small appliance, so while using it takes just a press of a button, all our experts stressed the importance of regularly cleaning brushes and filters, and running the vac when no one is in the room to keep the indoor air quality clean and avoid resuspended particles. We get into details over here

I tested each robot vac's cleaning abilities along with their extra features and app. You can find the details of how we tested, what else we recommend, what we don't recommend, how to shop for a robot vacuum, and more at the end of our guide.

Here are the best robot vacuums in 2021 Updated on 1/15/21: We're continuing to test robot vacuums for durability and provide long-term testing performance. We're also looking forward to testing new robot vacuums from Yeedi and Samsung for a future update of this guide. Table of Contents: Masthead Sticky The best robot vacuum overall Best Robot Vacuums 2021_Roborock S6 Robot Vacuum

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The Roborock S6 Robot Vacuum performs well on carpet, hardwood, and in corners. It can map your space for more efficient cleaning and mops floors for extra convenience.

Pros: Excellent on hardwood and in corners, good on carpeting, does not get stuck, has mopping capabilities, can be scheduled and set no-go zones in the app, Alexa compatible

Cons: Gets loud on the highest suction setting, larger than most vacuums making it hard to get into tight spots

The Roborock S6 Robot Vacuum performed well in every test we put it through. On carpeting, it picked up more than 90% of the flour, coffee grounds, kitty litter, and pet hair I laid out for it. On hardwood, it did even better picking up everything except for a little flour. The S6 gets within half an inch of corners — the deepest of all the vacuums we tested.

The vacuum also rarely gets stuck. It returned to its charging dock after a cleaning cycle without getting stuck along the way approximately 75% of the time. In fact, it even somehow managed to keep going despite a floor strewn with Nerf darts after an epic battle with my kids.

The Roborock S6 comes with a variety of extras, including an adjustable water tank that can be installed in place of the dustbin and a mop cloth to mop your floors. The mop function worked well and I appreciated that you can adjust how much water the tank dispenses so you're not creating mini floods everywhere. I recommend running the mop after vacuuming to minimize the chance of spreading dirt and dust around your floor. There's also a damp-proof mat attachment on the charging dock so your floors don't have prolonged direct contact with moisture. Unfortunately, extra brush heads aren't included. 

If you like smart gadgets, the Roborock app can be scheduled for cleaning sessions via the app or Amazon Alexa. You can also adjust the suction power and set how many passes the unit completes in a certain space. After a few runs, the S6 will have enough data to make a map of your home so you can set no-go zones.

Including scheduling, the set up of the S6 took about 15 minutes. All you need to do is charge the vacuum on the dock, pair the vac with the app, and you're ready to go.

There are a couple of things to consider with the Roborock S6, specifically noise and size.

On high suction power, it recorded 70 decibels, which is similar to city traffic. However, it does sport a Quiet mode, which is only around 56 decibels according to the manufacturer; I wasn't able to measure the noise output of this robot vac by the time I had to send it back to the company. At 14 inches in diameter and four inches high, it was also the largest vacuum we tested. This means it will have trouble getting under low-clearance furniture and into other tight spots. These aren't dealbreakers if you're able to compromise noise in favor of power and convenience.

Read our full Roborock S6 Robot Vacuum review.

The best affordable robot vacuum Best Robot Vacuums 2021_Eufy RoboVac 15C MAX Robot Vacuum

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The Eufy RoboVac 15C MAX Robot Vacuum offers an impressive suite of high-end features for its reasonable price, including smart connectivity and powerful suction on carpeting and hardwood.

Pros: Good performance on carpeting and hardwood, doesn't get stuck easily, quiet, supported by an app, Alexa and Google Assistant compatible, fits into small spaces

Cons: Performs poorly in corners, didn't pick up flour on carpeting, app doesn't let you set no-go zones

We tested four models that hover in the $300 price range – three Eufy models and a Roomba – and the Eufy RoboVac 15C MAX Robot Vacuum had the best overall performance in our tests.

On both carpeting and hardwood, it picked up all of the coffee grounds, kitty litter, and pet hair. With flour, it had a little harder time and left around 10% of the flour on hardwood and a disappointing 40% of the flour on the carpeting. Another area where the unit showed poor performance was in corners. It only came within about three inches of the hardwood corner, and though it came within an inch of the carpeted corner, it didn't pick up much of the flour.

The RoboVac 15C MAX only got stuck during its cleaning cycles about a quarter of the time, which is impressive in my messy home with two kids and three pets. Also, it's the quietest of the units we tested, registering 60 decibels on its highest suction power.

The vacuum has a small footprint at just 12.75 inches in diameter by 2.75 inches high so it can squeeze into tight spaces. The side brushes are around two inches long from the center to the tip, so they can get underneath low-clearance furniture too.

The 15C MAX comes with an extra set of side brushes, an additional filter, five cable ties for securing cords, a cleaning tool for maintenance of your vacuum, and a remote control with batteries. I tested the controller to make sure it worked, but ultimately, found it unnecessary. 

Who wants to keep track of a remote when you can control the vac with your phone? The vacuum pairs with your phone and is compatible with Alexa and Google Assistant, but unfortunately, the app doesn't allow you to set up no-go zones or virtual barriers. The setup and connecting to the app were seamless experiences taking a total of 10 minutes. 

The best robot vacuum and mop Best Robot Vacuums 2021 Ecovacs T8 AIVI

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The Ecovacs Deebot Ozmo Pro Mopping System thoroughly cleans floors as opposed to pushing a wet cloth around. When paired with the Ecovacs Deebot Ozmo T8 AIVI Robot Vacuum, the two make easy work of time-consuming chores.  

Pros: Excellent performance on carpeting and hardwood, automatically empties the dustbin, HD video surveillance, impressive deep-cleaning mop attachment, quiet operation

Cons: Got stuck on the threshold in our tests, doesn't get deep into corners

The Ecovacs Deebot Ozmo Pro Mopping System attachment is the best mopping system I've tested. Thanks to its 480-vibrations-per-minute scrubbing motion, it's able to provide a deep clean whereas other robot vac mops just push a wet cloth over your floors. It's compatible with the T8 family of Ecovacs, which made the powerful Ecovacs Deebot Ozmo T8 AIVI Robot Vacuum even better. 

In my testing, the 240mL water tank was large enough to complete at least two passes over the 500-square-foot test floor. With the app, you can choose from four water flow levels to reach a balance of moistness and quick drying, and two mopping patterns. The deep scrubbing option is good for a more thorough cleaning, but for the most part, quick scrubbing is my go-to for regular mopping — and even then, it's a very thorough cleaning. 

When the Ozmo Pro Mopping System encounters carpeting, it automatically avoids it so you don't get wet carpeting. In testing, I found the carpet detection sensor worked well.

As for the robot vac itself, the Ozmo T8 AIVI has HD video and a microphone so you can keep tabs on your pets or check for open windows and doors from your phone. I didn't find the home surveillance features particularly useful but they could be handy for people who are often away from the home and concerned about security. 

The more useful feature is the auto-empty station. With this dock, you don't have to empty the dustbin after cleaning sessions — the charging station does it automatically. You just need to replace the disposable pouch every month or two. 

On both carpeting and hardwood, the Ozmo T8 AIVI was among the best at removing all of the debris types we tested. Plus, it remains fairly quiet at just 67 decibels on the highest Max+ cleaning setting and 58 decibels on Quiet mode. 

However, the vac consistently got stuck on the one-inch lip between my living room and kitchen. It also wasn't able to come within two inches of corners so you may need to do occasional touch-ups using a hand vacuum or broom.

When it comes to set up, the process was seamless. I plugged in the dock to charge the vacuum, connected the app, updated the firmware, and set a schedule for cleaning. Once the vacuum mapped out my floorplan after a couple of cleanings, I was able to set no-go zones to keep the T8 AIVI away from sensitive areas.

The unit is on the bigger side measuring 13.75 inches in diameter and 3.5 inches high. This was just low enough to fit under my chairs and couches, but if you have radiators or low-clearance furniture, you may want to measure to make sure there's enough clearance or set no-go zones. The main brush of the vacuum is around 6.25 inches long, which is about average.

The best robot vacuum for hardwood floors Best Robot Vacuums 2021 Roomba S9+

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The D-shaped iRobot Roomba s9+ Robot Vacuum did the best in our hardwood floor tests and features a self-emptying dustbin, impressive app that lets you set no-go zones, and large main brushes that pick up debris on the first pass.

Pros: Cleans well on hardwood flooring, good performance on carpeting, rarely gets stuck, comes with a charging dock that empties the dustbin, large main brushes, has a useful app with virtual no-go zones

Cons: Loud, poor performance in carpeted corners

As iRobot's top-of-the-line model, the Roomba s9+ Robot Vacuum is another feature-packed vac. Like the Ecovacs T8 AIVI, the s9+ empties itself and is supported by an app that allows you to effortlessly schedule cleanings, set no-go zones, and customize your cleaning experience, including pairing it with the iRobot Braava Jet M6 (sold separately) to mop after it finishes its vacuum cycle.

In testing, the Roomba s9+ performed the best of any robot vac on hardwood flooring, likely due to the two large 9.5-inch main brush heads — the biggest we tested. After the cleaning cycle, there was only a trace of flour left. Its D-shaped design came within an inch and a half of the corner, picking up everything it could reach. On carpeting, the performance wasn't as impressive, but it was still solid with only about 10% of the flour left, 5% of the kitty litter, and no coffee grounds or pet hairs to be found after testing. The unit didn't get stuck in our testing area either. 

At 77 decibels (about as loud as a busy city street) on high suction power, the s9+ was by far the loudest model we tested, and even in Quiet mode, the vacuum is a not unnoticeable 64 decibels (a little louder than a normal conversation). 

Additionally, the vac got within an inch of the carpeted corner, but it left behind about 70% of the flour, which suggests it doesn't do as well picking up fine debris on carpeting, especially in areas the main brushes have trouble reaching.

Installation was easy, but it took about 25 minutes. Most of that time was spent installing firmware updates after connecting to the app. I liked that the s9+ comes with plenty of extras, including an additional filter (which needs replacing every two months), side brush (every three months), and dirt disposal bag for the self-emptying base (every month or so.) 

These extras mean you get several months of use before you need to replace parts that wear down. The app features tutorials on how to care for your Roomba, including the seamless purchase of replacement parts.   

The overall unit is around 12.5 inches in diameter and the 3.5-inch height should also fit under most furniture.

The best robot vacuum for carpet Best Robot Vacuums 2021 Roomba i3+

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With its strong suction and large main brushes that adjust to stay in contact with your carpeting, the iRobot Roomba i3+ Robot Vacuum is a great solution for carpeted homes.

Pros: Excellent performance on carpeting, cleans well on hardwood, pairs with the app and Alexa, comes with an automatic dirt disposal base, doesn't get stuck easily

Cons: Loud, virtual wall barriers cost extra, not impressive in corners 

The iRobot Roomba i3+ Robot Vacuum is fairly new and is iRobot's most affordable option with automatic dirt disposal.  

In our carpet tests, the i3+ picked up all of the coffee grounds, kitty litter, and pet hairs we laid out, and left behind only about 5% of the flour — the best performance of all the robot vacs we tested. In corners, it came within an inch of the wall but left behind about half the flour. The i3+ performed better on hardwood floors, picking up all of the coffee grounds and pet hair, and only left behind 5% of the kitty litter and about 10% of the flour. The robot vac didn't get stuck going back to its base after it completed its cleaning sessions.

Whereas some robot vacuums sense carpeting and boost suction, the i3+ provides consistently strong suction, and when it detects excess dirt, it will automatically perform multiple passes to ensure it gets all of the debris. There are two main brushes measuring 6.75 inches and each one adjusts and flexes to keep in constant contact with carpet and hardwood so it picks up more debris quickly. 

Though it doesn't come with a tool for cleaning the brushes and dustbin, the i3+ comes with an extra filter and disposal bag, which only needs to be replaced every month or so. Plus, setup is a breeze only taking about 10 minutes, including connecting to the user-friendly app. With the app, you can easily schedule your unit and connect to Alexa or Google Assistant.

Unfortunately, the app doesn't allow you to set up no-go zones, so you have to buy virtual wall barriers. It's a small 2 by 4.5 inch-high battery-powered device that creates a virtual barrier up to 10 feet long or a 12-inch radius that the Roomba avoids. In my experience, the barriers work as advertised, but at around $40 each, I'm more likely to use common household objects to create physical barriers to keep the Roomba out of areas I want to protect.

The other negative with the i3+ is how loud it is. My sound meter recorded 68 decibels, and you can't adjust the suction power for a quieter clean.

The overall dimensions of the vacuum are larger than most at 13.25 inches in diameter and 3.75 inches high. This can make it hard to get into tight spots, though I didn't experience any issues in my testing.

The best robot vacuum for pet hair Best Robot Vacuums 2021 Bissell Spinwave

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The Bissell SpinWave Robot Vacuum picked up all the pet hair on carpet in our tests and has a great assortment of mop attachments and accessories. The company is also committed to helping homeless pets and helps them find loving homes. 

Pros: Excellent job on hardwood and corners, picked up all of the pet hair in our tests, great mop attachment and accessories, app connectivity, small size, quiet operation

Cons: Can't set up no-go zones, gets stuck easily

In general, the robot vacuums we tested did an excellent job of picking up pet hair. However, the Bissell SpinWave Robot Vacuum is created specifically for pet hair and has a 5.75-inch tangle-resistant main brush, a useful mop attachment, and powerful suction. Specs aside, a portion of each sale also goes to the Bissell Pet Foundation, which is committed to finding loving homes for pets.

The Bissell SpinWave picked up all of the cat and dog hair we laid out on carpeting and hardwood and did a great job on hardwood and in corners. On the hardwood, it only left a trace of kitty litter and flour. In corners, it came within two inches of each and picked up more than 60% of the flour on both the carpet and hardwood. When you consider that it's among the quietest vacs we tested – 58 decibels on Quiet mode (slightly quieter than a normal conversation) and 65 on high suction – its performance is even more impressive. If you have particularly skittish pets, the low-decibel output is less likely to startle your fur friends. 

The vacuum also included a lot of useful extras and attachments that can help any pet parent, such as a mop tank attachment, spinning mop pads, and a trial-size bottle cleaning formula. Plus, you receive an extra filter, an extra set of side brushes, and a cleaning tool that helps remove hairs from the brushes and clean the filter.

In testing, the mop attachment worked seamlessly. You just fill the tank with water and some of the cleaning formula and attach it to the vacuum in place of the dustbin. The mop pads spin to scrub away stuck-on debris while the soft surface avoidance sensor keeps it away from area rugs or carpets.

The SpinWave has a quick set up taking all of five minutes, including installing the app and connecting the unit. With the app, you can schedule cleanings and customize the suction strength based on your preferences. Unfortunately, though, the app doesn't let you set up no-go zones.

At 12.75 inches in diameter and 3.25 inches high, it has a smaller and lower frame that can squeeze into small areas. The biggest limitation we found was it tended to get stuck easily. In our tests, it consistently got stuck on the one-inch threshold leading into the kitchen. We had to put up a physical barrier to get it to stop trying.

What else we recommend Best Robot Vacuums 2021

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Over the years, I've tested scores of robot vacuums. These are the ones that barely missed the cut for inclusion in our guide, but we still recommend:

Roborock S4 ($429.99): There's a lot to like about the Roborock S4. However, the main reasons it didn't make our guide are because it's loud, doesn't come with many extras, and at 3.75 inches high, it doesn't fit under low-clearance furniture. It's pretty similar to our top pick, the S6, but lacks many of the features, such as a mop attachment. However, the S4 was excellent on carpeting, hardwood, and in corners, and it rarely got stuck. This is a more affordable alternative to the S6 if you're not interested in a mop attachment. 

Roborock S6 MaxV ($749.99): For the most part, Roborock is doing a terrific job in the robot vac space. We recommend the S6 MaxV because of its excellent performance in our carpeting, hardwood, and corner tests. It also has video surveillance and a two-way microphone if you're looking for additional home security, no-go zones, and a useful app. But it has the same large dimensions as the S4 and it kept getting stuck on the one-inch lip leading into the kitchen of our testing course. It isn't as loud as the S4, but louder than others we've tested. 

iRobot Roomba i7+ ($799.99): The Roomba i7+ was the first robot vacuum to feature an automatic dirt disposal charging dock. Since then, iRobot has introduced two other models that improve upon the i7+. Though this Roomba has great high-end features, its performance doesn't justify its price. It only did a satisfactory job on carpeting and hardwood, and it got stuck fairly often. If you find the i7+ on sale, we recommend picking it up. Otherwise, consider the s9+ or i3+ instead. Read our full review.

Eufy RoboVac G30 Edge ($229.99): Eufy usually makes more affordable robot vacuums, so at this price, the G30 Edge is considered the company's top-end model. The variety of extras — no-go zone strips, a user-friendly app, and Alexa and Google Home compatibility — make it worth the price, but you'll have to compromise some power. It performed poorly on carpeting and in corners during our testing, and it was in the middle of the pack on hardwood. Despite the underwhelming performance, it remains a good value for the price.

Eufy BoostIQ RoboVac 11S ($219.99): The RoboVac 11S was the budget pick before our most recent guide update, but that was before we could put it through our tests. For this guide, we tested the 11S firsthand and it didn't perform as well as the RoboVac 15C Max, doesn't have the same Wi-Fi connectivity, and can't be paired with an app. It's a good basic vacuum that does well on carpeting — which is surprising since it didn't perform well on hardwood floors or in corners. You can often find it on sale for under $200, which we recommend grabbing if you're in the market for a more affordable robot vac. Read our full review.

What we don't recommend Best Robot Vacuums 2021

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We tested 16 robot vacuums, but they didn't all perform well. Here are the ones we tested and don't recommend.

iRobot Roomba e5 ($299.99): This appears to be iRobot's attempt to make a budget Roomba, but it's the worst-performing Roomba I've come across in my years of testing. It didn't come with any extras – not even an additional filter. You can schedule it easily in the app and it's compatible with Alexa and Google Home, but you have to buy virtual wall barriers separately. Also, it gets stuck easily and doesn't clean well on hardwood.  

Neato Botvac D7 Connected ($499.99): We're dropping the Neato Botvac D7 Connected from our guide this time around because it's relatively big, got stuck about half the time during our original testing, and it only comes with two extra filters and a magnetic barrier, which isn't necessary since you can set no-go zones in the app. We think there are more affordable alternatives that perform better and are more feature-rich in our guide. Read our full review.

Eufy RoboVac 11S Max ($249.99): The 11S Max is an update to the 11S, but we feel the original 11S is better. Ultimately though, if you're spending this much, the 15C Max performed much better in our testing. The 11S Max did poorly on carpeting, hardwood, and in corners. It also relies on a remote controller rather than app connectivity, which means you need to turn to and keep track of another device.

Roborock E35 ($349.99): At one point, we recommended the E35 as a good robot vac at this price, but since then, we have tested several others in this price range that outperform and have better features. The E35 doesn't do well with hardwood or corners and is big and loud. Read our full review.

Roborock S5 Max ($529.99): The S5 Max is loud, big, and it did poorly in corners and on carpeting in our tests. 

What we look forward to testing Best Robot Vacuums 2021

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We're constantly testing new vacuums to update our guide. Below are a few models we are currently testing or will be testing soon:

Samsung JetBot 90 AI+ (price not yet available): Samsung just announced the release of an AI-based robot vac at the 2021 CES trade show and we're looking forward to testing its smart-learning capabilities to avoid obstacles. It also has cameras and can be connected to the brand's SmartThings hub for another layer of home security. 

Yeedi K650 Robot Vacuum ($179.99): This is among the least expensive robot vacs I've seen — much cheaper than our current budget pick — so it'll be interesting to see how it performs. 

Samsung Electronics R7040 ($249): The R7040 was in a previous version of our guide based on positive reviews by other sites, but we weren't able to get a unit in time to test in this round. We're looking forward to seeing how its unique flat front-edge design works in corners.

Ecovacs Deebot Ozmo U2 Pro ($235.90): I'm currently testing the U2 Pro, and so far, it seems like a good budget mop/vacuum hybrid. It comes with two dustbins – a large 800 mL bin and an attachment that can be used to vacuum and mop at the same time. So far, it doesn't get stuck easily, but it gets relatively loud on both the high setting (68 decibels) and the Quiet mode (62 decibels).

Proscenic M7 Pro LDS ($479): I'm interested in testing this new-to-me brand and its robot vac with an automatic dirt disposal base. You can use the app to set virtual no-go zones and to clean specific rooms once the laser navigation system maps your home after a few runs. It's less expensive than other vacs with the same features, so I'm interested in seeing how it performs in our tests.

Trifo Lucy ($699.99): In addition to powerful suction and an outstanding app, Lucy has HDR video, a two-way microphone, and the ability to detect noise and people in your home as part of a home security set up. I'm interested to test its vacuuming abilities alongside the home security features.

Testing methodology Best Robot Vacuums 2021

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I've been reviewing vacuums for the past few years, writing numerous buying guides and reviews, so I leaned on my background when developing our testing methodology. I also consulted three experts and took their advice and expertise into consideration — Dr. Luis Javier Peña-Hernández, a lung and sleep health specialist at the Pulmonary, Critical Care & Sleep Disorders Institute of South Florida; Andrea Ferro, Ph.D., a professor in Civil and Environmental Engineering at Clarkson University and the current president of the American Association for Aerosol Research; and Jill Notini, the Vice President of Communication and Marketing for the Association of Home Appliance Manufacturers.

In addition to using each robot vacuum daily for at least several weeks, I tested each one for its suction on various types of flooring including corners, ability to maneuver around obstacles, noise, and special features. Our testing methodology has gotten more comprehensive over the years, so for any models that I'd previously tested but didn't have the vacuums on hand anymore, I extrapolated the data as best as possible based on previous testing and manufacturer info. Those vacuums are the iRobot Roomba i7+, Neato Botvac D7 Connected, Eufy 11S Max and 15C Max, and Roborock S4, S6, and E35. 

Here are the main attributes we look for and how we test them

Size: I note the specs of the overall unit, main brush, and side brushes. This gives me an idea of how well a vacuum can clean floors and carpet — the larger the brushes, the more they can usually sweep up. The main brushes are often somewhere between 5 to 10 inches long and side brushes are usually 2 to 3 inches long. Of the vacs I've tested, only Roomba models have two main brushes; others just have one. I've noticed that longer brushes tend to facilitate faster cleaning. If this appeals to you, consider a unit with a longer brush, such as the Roomba s9+.

Carpet cleaning: I poured a tablespoon each of flour, coffee grounds, and kitty litter on 18-inch-square sections of carpeting. To make sure I had enough pet hair, I also collected pet hairs from my rat terrier and two cats to place on carpeting. I ran the vacuum on its most powerful mode for two cleaning cycles and compared before-and-after photos to estimate the percentage of each material picked up or left behind.

Hardwood floor cleaning: This is the same test as the carpet cleaning test, but on hardwood flooring.

Corner cleaning: To test corner cleaning abilities, I poured a teaspoon of flour in an approximately four-inch-radius in a corner on hardwood and carpeting. I took pictures of the messes before and after running the robot vac for two cleaning cycles to compare how much flour was left over. I also measured how close to the corner the vac was able to reach.

Obstacle avoidance: You don't want your robot vac to get stuck while it's cleaning or when it's returning to its charging dock, both of which force you to hunt it down while it's sending you notifications or making annoying error sounds. I tested the vacuum in an approximately 500-square-foot room with several obstacles, including stairs, a one-inch threshold to a kitchen, and a table with chairs.

Loudness: I used a sound meter to measure the decibel output of each of the robot vacuums from 12 inches away as they ran on the highest and lowest settings. For vacuums I no longer had in my possession for testing, I relied on manufactures' info and my previous notes. 

Brushes: I noted the lengths of the main and side brushes as they'll likely indicate performance in our cleaning tests.

Robot vacuums work using a combination of suction and brushes. There are two types of brushes on a robot vacuums: the side brush and the main brush. Units have either one or two side brushes that are about three inches in diameter and protrude from the forward portion of the vac. They move in a circular motion, get into corners, and feed debris to the main brush. There appears to be little difference in the performance of vacuums with two side brushes versus those with one.

The main brush is between five and ten inches long, located under the unit, and is made of a rubber-like material. The vacuum sucks debris into the main brush which spins to feed the materials into the dustbin. Of the vacs I've tested, only Roomba models have two main brushes. Other models just have one. I've noticed that longer brushes tend to facilitate faster cleaning. If this appeals to you, consider a unit with a longer brush, such as the Roomba s9+.

Extras: I note if the vacuums included extras such as filters and side brush replacements, mop attachments, a cleaning tool, and more.   

Special features: All of the vacuums featured some method for scheduling and returning to their charging dock on their own, so those weren't useful differentiators. To separate the wheat from the chaff, I looked at features that weren't universal such as auto-dirt disposal and home surveillance, and spoke with Jill Notini, Vice President of Communications and Marketing for AHAM.

A few of the new features she's excited about — and that are found in many if not all of the models in our guide — include:

  • Advanced navigation: "Many of today's models have the ability to map a home and remember how to get around objects and stay out of tough spots. You can also program the robots to vacuum specific areas of the home." You can also set no-go zones that the vacuum should avoid on your phone via the app.
  • Mopping ability: "Robots are evolving into floor care multitaskers," said Notini. "In addition to vacuuming, some models now have the ability to mop, both wet and dry."
  • Voice control: "Robotic vacuums can now respond to voice commands, either directly or through an outside system like Amazon Alexa."
  • Remote operation: "You can start, stop, or control your robotic vacuum with your mobile device."
  • Cameras: "Cameras have been incorporated into some models to help the robot map the room and allow you to get a robot's eye view of cleaning and keep an eye on your house while you're away."
  • Fall prevention: "Even with all of the new features and technological advances, robotic vacuums still have not gained the ability to climb stairs. Many models now utilize sensors to prevent themselves from taking a tumble down the stairs or off a higher level." All of the robots in our testing were able to sense cliffs and avoid falling down stairs.
  • Automatic dirt disposal: One of the most useful features that's becoming more ubiquitous is the charging dock that automatically empties the vacuum's dustbin. Even the largest bins need to be emptied with regular use so it's a maintenance task you'll need to perform once a week — at best. But with the self-emptying dock, the chore is no longer necessary. You just throw away and replace the disposable dirt bag every month or two.
Why we don't measure Pascal Pressure Unit Best Robot Vacuums 2021

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A robot vacuum's suction power is measured in Pascal (Pa). Generally speaking, the higher the Pa, the better, but that's a misleading metric of comparison. 

When I talked to engineers at iRobot about a year ago, they told me that there are several ways to measure suction power, but there are no industry standards. They viewed the reported Pa measurements as essentially useless, hence why it's nearly impossible to find suction power for iRobot vacs. It's also difficult to find the Pa for Ecovacs, though Eufy and Roborock report the measurements for their models.

Due to the inconsistent reporting from manufacturer s, we don't include Pa as a part of our testing methodology and criteria.

How to shop for a robot vacuum Best Robot Vacuums 2021

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While using a robot vacuum is easy enough, shopping for one can be overwhelming. Here are the main aspects to look for when considering which one to buy. 

Size: If you have furniture that's hard to move or low-clearance pieces like sofas or bed frames, you'll want to pay attention to the height of a robot vacuum; the other dimensions are usually within the range of reason for a normal household. For example, I have several radiators in my house with a 3.5-inch clearance that slim vacuums can get under, while just-slim-enough models sometimes get stuck, and too-thick models bump up against and go elsewhere. If you want your robot vacuum to get under your low-clearance furniture, make sure you choose a model that is slim enough to do so. 

Features: It's important to think about what features you actually need. For instance, if you work from home and are rarely away, HD cameras aren't useful since you can keep tabs on your home with your own eyes. If your floors are covered with carpet, you don't need your robot vac to mop. I also almost never use voice control out of personal habit, but if you use Alexa or Google Assistant for everything, then compatibility with those services is a must.

Extras: You can easily purchase extra filters or brushes for robot vacs, but we think having them included with the unit is better. All of our top picks include useful extras like brushes or dirt disposal bags.

Price: Robot vacuums go on sale often, and the discounts are steepest during Amazon Prime Day, Black Friday, and Cyber Monday. We expect most of the models we recommend in this guide to go on sale so it pays to wait until those sale days.

How to use a robot vacuum Best Robot Vacuums 2021

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Robot vacuums make keeping your house clean easier, but there's still some regular maintenance needed to improve the performance and longevity as well as help your indoor air quality. 

Run your robot vac when no one is around: Andrea Ferro, Ph.D., a professor at Clarkson University and president of AAAR, and Dr. Luis Javier Peña-Hernández, a lung and sleep health specialist at PCSI, both recommend running your robot vacuum in unoccupied areas. The robot vacs can kick dust, pollutants, and microbes back into the air as it vacuums floors, which can lead to subpar indoor air quality. "Every vacuum, including a robot vacuum, has the potential to release some dust, particles, and allergens back into the air, but the benefits still outweigh the risks," said Peña-Hernández. 

And run it regularly: Ferro and Peña-Hernández agree that you should run your robot vac at least once per week and more if you have pets and heavy-traffic areas. Ferro even suggests that daily cleaning isn't a bad idea. I generally set my vacuums to run in the early morning before I wake up or when the level of my house where the vacuum is running will be unoccupied, especially since I live in a large house with three pets and no HVAC system.

Clean the dustbin and filter: If you're regularly vacuuming your space, you'll need to make sure to empty the dustbin and clean the filter. According to Peña-Hernández, you should clean the vacuum's filter at least once a week, or twice a week if you have a pet.  

You'll also need to replace the filter and brushes every few months. Manufacturers usually give guidelines in the vac's user manual on how often you should replace these components, but a good sign that it's time to replace your filters or brushes is if they appear to be damaged or if your vac just isn't doing as good of a job of cleaning as it once did. 

Fortunately, many models come with extra filters and brushes, but eventually, you'll have to purchase replacements. Manufacturers usually link to their parts store in your robot vac's app, but you can also usually find parts on Amazon so it's worth shopping around. Just make sure that you are buying the right parts for your model.

Use it in addition to a traditional vacuum:  Despite how far robot vacuums have come in the last decade, they won't replace your stick and upright vacuums anytime soon. "Research indicates that robot vacuums are not meant to replace upright vacuums," Peña-Hernández said. "That likely has to do with their smaller motor size. They're good for touch-ups and in-between uses."

Ferro said, "I think you'd still need a stick or upright vacuum for spots that the robot vac can't reach." This has been my experience as well as traditional vacuums can do a better job on corners, stairs, walls, ceilings, and deeper cleaning. 

Can a robot vacuum prevent the spread of the novel coronavirus?

The novel coronavirus is most easily spread through face-to-face interactions and in close quarters, and if someone in your household has been sick — even if it's not with COVID-19 — it's recommended to clean and disinfect the area.  

"Currently the CDC recommends that we take precautionary measures for vacuuming during the COVID-19 outbreak although there are no reported cases of COVID-19 associated with vacuuming," Peña-Hernández said. "It recommends using a vacuum with a HEPA filter, opening outside doors and windows to increase air circulation, and not vacuuming areas with people in it." 

Check out our guides to more great vacuum cleaners dyson v11 outsize vacuum review

Connie Chen/Business Insider

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