White robot vacuum - Best Robot Vacuum Under 400

Best Robot Vacuum Under $400 in 2020

Household duties can get you tired very quickly. Sometimes everything you need is to lay down and rest after a long day’s work, or to worry with nothing other than your morning exercise after waking up. But how does the floor always seem so dirty? Well, we have good news for you: in today’s age, you can get a small robot to help you with all the cleaning! He won’t complain, won’t charge you anything, and most of them won’t even need your help to get back to the charging station when they run out of battery!

Top 5 Robot Vacuums – Roundup Table


RoboVac 11S
Deebot N79S

iLife A4S Robot VC 

Roomba 690
RoboVac 30C
Dimensions12.8×12.8×2.8 in
32.5×32.5×7.2 cm
13x13x3.1 in
33x33x7.8 cm
12.2×12.2×3 in
31x31x7.6 cm
13x13x3.7 in
33x33x9.4 cm
12.8×12.8×2.8 in
32.5×32.5×7.2 cm
Battery LifeUp to 100 minUp toUp toUp to 90 minUp to 100 min
Dustbin Capacity 0.6 L 0.3 L0.45 L0.3 L0.6 L
Virtual WallsΧΧΧ
Remote ControlΧ
Phone ControlΧΧΧ
Overall9 🐢9 🐢9 🐢8 🐢7 🐢
PriceCheck PriceCheck PriceCheck PriceCheck PriceCheck Price

When these robots were first put on the shelves, you would have to spend tons of money to get them, but not nowadays! In our opinion, one of the best robot vacuums out there costs less than $300 (the one in the 1st place of this list)! Here you’ll find five of the Best Robot Vacuums Under $400 you can choose from. If you want help deciding which one is better for you, just keep on reading!

Are Robot Vacuums Any Good? - black robot vacuum in the ground

What Makes One Robot Vacuum Better Than Another?

Robot Vacuums are not all the same with different price tags depending on the brand. There are many features and technologies in the robots chosen for this list that $100 robots usually don’t have.

Starting with the navigation technology, there are three types: programmed navigation (without many if any customizable options when it comes to navigation); camera navigation (with very good space mapping but requires the lights to be on); and laser navigation (very similar to camera navigation but also works in the dark). Robot Vacuums with camera or laser navigation usually come with the option to create virtual walls, used to keep the robot away from whatever zones you wish (such as pet’s bowls or a zone with cords in the ground).

Other very important features that differentiate robot vacuums are the cleaning systems, the suction power, the ability to follow walls, the dirt detection system, the ability to detect stairs and drop-offs, the compatibility with Alexa and Google Assistant, and many more.

If you wish to understand how robot vacuums work and all the information about the technologies and features in a robot vacuum, take a look at our article about it: Are Robot Vacuums Any Good? – A Complete Guide.

white robot vacuum on carpet - Best Robot Vacuum Under 400

4 Major Things to Pay Attention to When Choosing a Robot Vacuum Cleaner:

There isn’t one robot perfect for everyone, it always depends on what and where you want the robot to clean. The four main questions are: Do you have low furniture? Do you have high pile carpets? Is pet hair something you want the robot to take care of? Are cords and carpet fringes in the zone you want your robot to clean?

We go through each of these in great detail in our guide: Are Robot Vacuums Any Good? – A Complete Guide. But here is a resumed version:

If you have low furniture, you should pay attention to the height of the robot vacuum. One of the slimmest robots out there (only 2.85”/7.3cm in height) is also our first pick for this list: the RoboVac 11S. If you have high pile carpets, the first thing you should look at is the suction power of the robot vacuum. Something pet owners should pay attention to is the capacity of the dust collector (to take care of all the pet hair). And even though most robot vacuums are ready to deal with cords and carpet fringes, if you have a specific zone with a lot of cords in the ground that you don’t want to be messed with, you should look at getting a laser or camera navigation robot that lets you draw however many no-go zones you wish in the app.

Now let’s take a closer look at our top picks for this list:

Our Picks:

Eufy RoboVac 11S
- Amazing performance for an impressive price

Ultra slimNo virtual walls
Very silentNo app control 
Strong suction
Not many
scheduling options 

This is our pick for the best robot vacuum under $400 as of this month. The RoboVac 11s has the distinct advantage of behind very compact, meaning it can easily go under most of the furniture you may have so you don’t have to worry about doing any cleaning manually. Another important feature to note is that it’s super quiet, you can perfectly take a nap right next to it.

Even though we think this is the best of the best, we can’t ignore that a strong argument against this robot vacuum is the lack of virtual barriers or app control. This might be a deal breaker for you, but truth be told, most people don’t really need the virtual walls feature, the best thing for most people is to just let the robot do whatever it wants and forget about it.

Ecovacs Deebot N79S - 2nd Best Robot Vacuum Under $400

Super affordableNo Virtual Walls
Very strong 
suction power
 Some navigation
App and voice controlSmall Dustbin 

This robot vacuum is a great choice for those who have a lot of carpets, as it has a very powerful suction. It’s one of the most affordable vacuums we could find that still gives you premium features such as Amazon Alexa compatibility, meaning you can command it with your voice if you have an echo device. 

The only flaw with this vacuum is that it’s not easy to set up with the Wi-Fi, but after a couple of tries, you should be able to set it up and never think about it again. If you have any questions about this, you can always leave a comment below and we will find the solution for you.

iLife A4s - 3rd Best Robot Vacuum Under $400

Good schedulingNo virtual walls
Multiple cleaning
 Sometimes gets lost
returning to charging dock
Long battery life 

Much like the first placer on our list, the iLife A4s is quite compact and has a very long battery life. Its software supports scheduling and multiple cleaning modes. This little buddy might occasionally become lost returning to the power station, but when it happens, it’s funnier than it is annoying, especially if you have kids that like to toy around with it.

iRobot Roomba 690 - 4th Best Robot Vacuum Under $400

App controlSome navigation issues
Voice control 
Strong suction power 

From one of the most respected companies in the industry, the iRobot Roomba 690 is a great choice if you don’t want to blow up your wallet with the high-end robot vacuum models. You can connect it to the WiFi, control it with your phone and with your voice, as it supports voice recognition via Amazon Alexa and Google Assistant. With 3.4 inches in height, the Roomba 690 should be able to go under some furniture but struggle to clean under low-profile couches or cabinets.

RoboVac 30C - 5th Best Robot Vacuum Under $400

Very SlimNo app or voice control
Comes with
boundary strips
Needs strips for
virtual walls
Strong suction
Not many scheduling

Even though the RoboVac 30C is in 5th place in our list, it might actually be a great pick for you. It doesn’t have the longest brush roller, it doesn’t have the best looking companion app, and it doesn’t have the best mapping technology out there. But I don’t know if there is a better robot (other than maybe the RoboVac 11s) with a more powerful suction than this little guy, making it a great pick if you have a lot of carpets and rugs.

If everything you care about is very good cleaning performance, then the RoboVac 30C was made for you.

I hope this guide was helpful to you and answered every questions you had! 

But if it didn’t, just leave a comment below or contact us via Facebook, Twitter or Instagram and we will get back to you as soon as we see your message! 🐢

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