Robot vacuum buying guide: What you need to know

Roborock S7 MaxV Ultra on hardwood floor
(Image credit: Tom's Guide)

If you’re stuck on the fence about buying a robot vacuum, this guide can help you out. Robot vacuums have come a long way since they were first introduced — they were initially viewed more as a triviality, rather than an appliance to take seriously. And while some models still bump into walls as they work their way around, the pick up rate and navigational capabilities are better than ever before. Some of the latest advancements include self-emptying bases, so you don’t have to empty the dustbin so often, as well as object recognition, so it can avoid and report obstructions to you. Considering all this, it’s no wonder why more and more of us are opening our homes to these little helpers. But, what should you look out for if you’re in the market for one of the best robot vacuums? This guide will take you through the different types on offer, as well as the strengths and weaknesses behind each, so you can make an informed decision. 

Before you do anything else, make sure you’re clear on your budget. Robot vacuums can cost anywhere from $200 to over $1,400, so it’s surprisingly easy to overspend. We recommend deciding your budget as well as the features you need in advance of browsing. That way you know exactly what to look for, and can get the best value for your money. We can tell you first hand that you don’t need to spend an excessive amount to get a good robot vacuum. In fact, our tests have proven that some models perform just as well as those twice the price. So, don’t be driven by expensive features you’re not likely to use. 

The best robot vacuum for you will vary depending on the layout of your home as well as your specific needs and preferences. For instance, some function better on hard floors, while others excel on carpets. If you’ve got pets running around, the best robot vacuums for pet hair also exist. So, consider what your home needs from your robot vacuum before you make a choice. If you’ve got plenty of hard floors, perhaps one of the best robot mops will be necessary. 

We’ve conducted countless robot vacuum tests to help you pick out your ideal model. Each test involved collecting Cheerios, kitty litter and pet hair from both hard floors and carpet. Plus, we used each robot vacuum at home, exactly as you would, to find every pro and con behind the design. We checked how easy it was to access and control via the corresponding app, and we factored in the settings on offer, such as no-go zones and multi-level mapping. After extensive testing, we’ve compiled several buying guides to showcase our results, including the best Roombas, the best cheap robot vacuums and the best robot mops. We can even tell you what it's like when you use a robot vacuum in your home for the first time. So if you need help picking out a model, or simply want to know more about robot vacuums so you can decide if it's right for you, you’ve come to the right place. Here are some buying tips to get you started.     

Robot vacuum deals 

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If you’re thinking about investing in a new robot vacuum, be sure to check out our robot vacuum deals page first. We update it regularly with the latest sales in robot vacuums and mops. Plus, models with self-emptying bases sometimes make an appearance.  

Quick tips for buying a robot vacuum

  1. Start by surveying your home. Consider whether you mostly have hard floors or carpet. If you have carpet, how thick is it? Think about pets as well — will the robot vacuum have to pick up kitty litter or thick fur? These are all important aspects to consider before you start shopping for a robot vacuum.  
  2. Decide on your budget. As mentioned earlier, robot vacuums with the latest features can cost over $1,000. Cheaper models are available for around $200, but be prepared to lose some of the premium features, such as WiFi connectivity or the self-emptying dustbin. 
  3. Do you want an app with that? Some robot vacuums can be connected with dedicated apps. Apps are useful for monitoring your robot vacuum and scheduling cleaning sessions. These can also help with mapping out your home and creating no-go zones.  
  4. Robot vacuums use varying methods of navigation. If you invest in a lower-end robot vacuum, it will likely move sporadically and bounce off walls and obstructions in the process. Whereas, some medium and high-end models use lasers and optical sensors to guide them. 
  5. Some models clean better than others. Every robot vacuum performs differently. Some collect dust and debris more effectively than pet hair, while others might work better on hard floors rather than carpet.  
  6. Do you want a self-emptying base? Self-emptying bases are becoming more and more popular, and they're now pretty much expected alongside the most premium models. As the name suggests, these allow your robot vacuum to self-empty, so it can continue on it's route uninterrupted. Some contain water tanks as well, so the onboard tank can be refilled or the mop cloth can be cleaned. As you can imagine, these are expensive features, so only opt for them if you really need them.   

Why do you want a robot vacuum?

The iRobot Roomba i3+ charging

iRobot Roomba i3+  (Image credit: Future/Meghan McDonough)

This is the future, and we have robots doing it all: Cars that drive themselves, drones that navigate the sky and robot vacuums that find their way around furniture. A robot vacuum keeps things relatively clean and saves you the hassle of hauling out the heavy canister vacuum every time a bowl of peanuts falls on the floor.

Though robot vacuum technology has advanced a lot recently, you’ll probably still want to keep a traditional vacuum cleaner around for deep cleaning. Robot vacuums are great for daily tidying-- picking up stray crumbs, cat litter, hair of all types, dust bunnies and everything else that finds its way onto your floors. They're suited for office spaces, too, because the last thing you want to worry about when you're on deadline is why the floor is covered in sprinkles. They’re also great for roommates as it means there’s one less chore to split up. 

Many robot vacuums can be scheduled to run as often as multiple times a day, and some app-enabled robots allow you to watch their progress as they clean. If you're concerned about allergies or dust, you can also find models that empty the on-board dustbin into a larger bin in the base — minimizing your exposure to dust.

Robot vacuum buying guide: How big is your house?

First things first: Consider how big your house is before you start browsing the Amazon aisles. Some robot vacuums, like the iLife V3s Pro, work better in small environments like apartments and townhomes, while models like the Roborock S4 Max are better-suited for spaces of up to 2,000 square feet with multiple rooms and multiple floors. Your pick will mainly depend on the size of your dwelling.

You'll also want to figure out how much room you have under the furniture for the robot vacuum to pass through. Robot vacuums like the iRobot Roomba i3 are 3.6 inches tall and likely can’t fit under a couch, At just under 2.85 inches tall, the Eufy Robovac G30, for example, has an easier time navigating through tight spaces.

Roborock S7 MaxV Ultra in charging dock

(Image credit: Tom's Guide)

Do you have carpets or hardwood?

Most robot vacuum models can easily handle cleaning both carpets and hardwood, but some are better at cleaning one or the other. Higher-end robot vacuums such as the Roomba S9+ can accommodate rapid surface changes by ramping up power whenever carpet is detected, and then throttling back down when it senses hardwood. Rugs should also factor into your buying decision. You might find that lower-end models will get caught up in tassels.

iRobot Braava Jet M6 on hardwood floor

iRobot Braava jet m6 (Image credit: Future)

If you're just looking for hardwood maintenance, you can go as cheap as the $118 iLife V3s Pro, as it does very well with cleaning pet hair off hardwood floors. If your floors are vinyl and tile, and you're hoping for some mopping help, there's the iRobot Braava jet m6, which is specifically made for dusting and washing floors using a spray nozzle. (It's tops on our list of the best robot mops). 

We've tried so-called hybrid robot vacuums that can both vacuum and mop, but found the trade-offs rarely justify the price and don’t actually make the tasks any more convenient. The one exception is the Roborock S7, which is the first robot vacuum/mop we've tested that performs both jobs well. 

Do you have cats or dogs (or any other pet that sheds)?

Roborock S4 Max robot vacuum

(Image credit: Tom's Guide)

Thankfully, many manufacturers make robot vacuums that are suited for cleaning up after pets. Models like the iLife V3s Pro, the Roomba S9, and the Roborock S4 Max scored the best in our robot vacuum lab tests, picking up nearly all pet hair on both hardwood and carpeting. And if you suffer from allergies, these robot vacuums have high-efficiency filters to help eliminate allergens that are hanging in the air.

Of course, the downside to having a robot vacuum clean up after your pets is that you'll also have to make sure you plan for frequent maintenance. Things like the roller brush, side brushes and filters will eventually wear out and need replacing. And even if you just want a robot vacuum to help with kitties that scoot their litter over the side, you'll need to remember to empty out the dustbin frequently so that it doesn't overflow. Don’t want to think about it? 

There are now several robot vacuums available with self-emptying dustbins such as the iRobot Roomba i7+, the Roomba i3+, the Ecovacs Deebot Ozmo T8, and the Shark IQ. Some manufacturers allow you to purchase the auto-emptying bases separately, so you can upgrade if you decide it’s a feature you’d like.

If your pets sometimes have accidents, which can be your worst nightmare when combined with a robot vacuum, then you might be interested in the new iRobot Roomba j7+. It features machine learning to identify objects and learn from its encounters. This means it's guaranteed to avoid pet poop — when we put it to the test, we found it was very effective. 

Do you want a "smart" robot vacuum?

The internet is a glorious thing that helps keep us connected, not only to other people but also to our appliances. Most robot vacuums now offer companion apps for your smartphone that give you full control over your bot wherever you are. Even vacuums that don’t support mapping, such as the iRobot Roomba 675, are connected to your home’s WiFi and controlled via an app. While features vary by manufacturer and model, most robot vacuum apps allow you to start and stop the bot, schedule cleanings, and increase or decrease suction intensity.

If a robot vacuum has app capabilities, it often means that it also offers Amazon Alexa or Google Assistant integration. If it does, you can enable its voice-command capabilities by enabling the skill and saying "Roborock, start cleaning!" and the vacuum will get going.

There are still a few entry-level robot vacuums that come with a remote instead of connecting to an app. While you’ll save some dough, it could be a hassle to use all of the vacuum’s features if the remote goes missing. At the very least, all robot vacuums include an onboard start/stop button.

Hybrid robot vacuum/mops aren't great

There are more than a few robot vacuums that also have a mopping feature built in, which is in theory a great idea: A single device to clean both your carpets and your hardwood floors. However, the models we've tested didn't excel at one or both functions. 

So far, our favorites are the Roborock S7, the Roborock S6 MaxV, and the iLife V5s Pro. The V5s Pro was inexpensive and great at vacuuming, but was a poor mopper. Yes, it'll cost more, but if you want a robot mop, it's worth investing in a dedicated device. For smaller homes, the iRobot Braava jet 240 ($179) is a simple, affordable dedicated mopping bot.

Battery life isn't a huge concern, unless you have a huge house

Here's the thing about robot vacuum battery life: It only matters to a certain extent. Throughout all of our robot vacuum testing, nearly every vacuum we tested lasted through an entire cleaning session without needing to charge.

On average, a robot vacuum can clean for up to an hour and a half, with some high-end models lasting a full two hours. Many vacuums will even navigate back to their base stations, charge up and then finish cleaning to get the deed done.

Settle on a budget

Robot vacuums are available in all sorts of shapes and sizes and at varying prices. As with most things in life, the more you spend, the more features you get. For example, higher-end robot vacuums will have better mapping capabilities and include features like keep out zones, single room cleaning, and targeted area cleaning for high traffic spaces. They also have more add-on features such as charging docks with auto-emptying dustbins and sonic mopping attachments.

However, we've found robot vacuums less than $200 that clean just as well, if not better, than models that cost three to four times as much. Just don’t expect too many fancy features. Also, keep in mind that many manufacturers will discount older models as they release newer ones. 

Robot vacuum buying guide: What you get for less than $200

Low- to mid-end robot vacs will offer long cleaning times, large dustbins and low profiles, but, to save you a few bucks, they often forego such things as Wi-Fi connectivity and sophisticated navigation. So, instead of moving around a room in an orderly fashion, they'll ping-pong around randomly until the job is done.

Our top pick under $200 is the iLife V3s Pro, which is just $118, but was one of the best cleaners of all the robot vacuums we tested. Almost as impressive is the WiFi-connected iRobot Roomba 675, which can be found for $199 and works with Alexa and Google Assistant.

Robot vacuum buying guide: What you get for $200- $600

If you’re able to budget more for home cleaner, you’ll have a lot of options with features such as home mapping, room-specific cleaning and automatic dirt detection. Mapping is incredibly handy because it increases a robot vacuum’s cleaning efficiency and ensures that the vac is cleaning the whole level and not aimlessly bouncing around under kitchen chairs.

Our current overall favorite robot vacuum, the $429 Roborock S4 Max sits right in the middle of this price range and multi-level mapping and room-specific cleaning. Other solid picks in this range are the Neato D4 for $299, the quiet cleaning Eufy Robovac G30 Edge, and the iRobot Roomba i3+ with self-emptying base for $599.

Robot vacuum buying guide: What you get for more than $600

Good help doesn't come cheap. There are relatively few robot vacuums in this price range, and most of the advanced features available in these bots fall under “nice to have” instead of “absolutely necessary.” These include the ability to map up to 10 floors, avoid specific areas, empty their own dustbins, and work in partnership with other robot vacuums.

Our top pick in this bracket is the iRobot Roomba S9+, which is not only an excellent vacuum, but also has a recharging base with a dustbin that sucks the dirt out of the vacuum. This means you don't have to empty the vacuum after each cleaning nor do you have to deal with the dust. The S9+ also works in conjunction with the iRobot Braava jet M6 ($399), a robot mop, so that when the vacuuming is done, the mop can take over. However, the S9+ costs $1,099 ($899 without the self-emptying base), so it's a real investment. 

How easy is it to clean or maintain?

Since robot vacuums are designed to clean, we often forget that these also need regular maintenance. In fact, forgetting to clean is one of the 9 vacuum cleaner mistakes you’re probably making.  It's best to always empty out the bins after use to prevent an overflow of dirt and grime. This will also affect the robot vacuum's over performance.

Similarly, it's good practice to cut free any hairs which have tangled in the rotating brush as well as clean the filters. Some brands come with a designated cleaning tool to make these tasks easier. In addition, the filters will need replacing — you should refer to your manual for guidance on how often to replace and where to buy. 

What are the disadvantages of robot vacuums?

Sometimes robot vacuum cleaners do sound too good to be true, and there are definitely factors you should be aware of before making a purchase. 

Firstly, a robot vacuum won’t replace your upright model. Unfortunately, these devices can’t provide as much power as corded or stick vacuum cleaners. Robot vacuum cleaners will only offer light, everyday cleaning — you unfortunately will still have to get out the best vacuum cleaner every couple of weeks. So forget about giving up vacuuming by hand in exchange for a robot vacuum cleaner.

Next, robot vacuum cleaners can take up a substantial amount of floor space, particularly if you opt for one with a self-emptying base, and they’re situated permanently. We found the impressive-looking Roborock S7 MaxV needed a lot of room to fit the multifunctional base — the dock has a total footprint of 19.4 inches by 16.5 inches. And add to that, any robot vacuum you buy will require a certain amount of empty space on each side and above to function. Make sure you check the space requirements before you pick a model, and consider how this will impact the decor of your home. 

Robot vacuums have come a long way, and some of the best robot vacuums are pretty independent, but unfortunately some can still get stuck in tight spaces and require your help to recommence. So, unless you move all potential obstacles out of the way prior to each session, be prepared to help your robot vacuum once in a while. If you decide to purchase a model without a self-empty base, be aware that you will need to empty the dustbin yourself every couple of runs as well. 

While it’s good to be aware of the above, don’t forget about the convenience and the positive impact these devices can have on your day-to-day life. They will ultimately keep your home clean and require very little maintenance.   

Katie Mortram
Homes Editor

Katie looks after everything homes-related, from kitchen appliances to gardening tools. She also covers smart home products too, so is the best point of contact for any household advice! She has tested and reviewed appliances for over 6 years, so she knows what to look for when finding the best. Her favorite thing to test has to be air purifiers, as the information provided and the difference between performances is extensive.