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Roomba s9+ vs i7+ (2021): Which Self-Emptying Robot Vacuum is Better For You?

The Roomba s9+ and Roomba i7+ are both top-of-the-line self-emptying robot vacuums by iRobot. While both are self-emptying and come with their Clean Base, iRobot’s flagship s9+ comes with a much heftier price tag than the i7+. We hone in on the similarities and differences of the Roomba s9+ and the i7+ to help you decide which better suits your home and your budget.

Roomba s9+ vs Roomba i7+ Comparison Chart

ModelRoomba s9+Roomba i7+
iRobot Roomba s9+ (9550) Robot Vacuum with Automatic Dirt Disposal-Empties Itself for up to 60 Days,... iRobot Roomba i7+ (7550) Robot Vacuum with Automatic Dirt Disposal-Empties Itself, Wi-Fi Connected,... 
PriceCheck Price Check Price 

Dimensions12.25″ x 12.25″ x 3.5″13.34″ x 13.34″ x 3.63″
Weight8.15 lbs7.44 lbs
NavigationiAdapt 3.0 with vSLAMiAdapt 3.0 with vSLAM
BrushesDual Multi-Surface Rubber Brushes, Edge-Sweeping BrushDual Multi-Surface Rubber Brushes, Edge-Sweeping Brush
HEPA FilterYesYes
Clean Map ReportsYesYes
Suction Power40x the power of the Roomba 600 Series
(approx 2,200 Pa)
10x the power of the Roomba 600 Series
(approx 1,700 Pa)
Zoned Cleaning and Imprint MappingYes
Wi-Fi and Smart Home ConnectedYesYes
PerfectEdge TechnologyYesNo
RuntimeUp to 120 minutesUp to 120 minutes
Charging Time180 minutes180 minutes
Recharge & ResumeYesYes
Bin Capacity550 mL700 mL
Full Bin IndicatorYesYes
Clean Base Automatic Dirt DisposalYesYes
Imprint LinkYesYes


The Roomba s9+ have edges equipped with a corner brush, wider brushless rollers, and better wheel design than the Roomba i7+

The Roomba s9+ (left) boasts PerfectEdge Technology for better corner cleaning

At a glance, you will notice how the Roomba s9+’s D shape is a departure from the rest of the iRobot series’ round shape. This redesign gives the s9+ an edge over the Roomba i7+ when it comes to corner cleaning performance. The new s9+ also comes with a softer Corner Brush that spins more slowly than the stiffer side brush found in the i7+. This new brush design allows for a cleaner pick up.

Measuring 12.25 x 12.25 x 3.5 inches, the s9+ is a little smaller than the i7+ which measures 13.34 x 13.34 x 3.63 inches. Since the s9+ is a little smaller, it has a smaller 550 mL bin capacity compared to the i7+ that can store up to 700 mL.

iRobot moved the dual brush rolls to the front of the s9+ (left) robot vacuum

Like the previous iRobot vacuums, the brush rolls of the Roomba i7+ can be found at the center. As for the s9+, you will notice that the brush rolls are located at the front of the Roomba and are wider by 30 percent. As a result, the wider brush rolls allow for a wider cleaning path in one go. Its new wheel design also lets the s9+ climb over thresholds better than the i7+ can.

Cleaning Performance

The Roomba s9+ has powerful suction than the automatic i7+

The Roomba s9+ (left) is one of the most powerful robot vacuums in the market

Both robot vacuums work great for deep cleaning as iRobot’s patented three-stage cleaning system is paired with powerful motors in these robovacs. With that said, the Roomba s9+ is more powerful than the i7+ and other top-of-the-line robot vacuum cleaners from other brands.

With an approximate suction power of 2,200, the s9+ can pull dirt, debris, and hair almost as well as upright vacuum cleaners. If your floor has crevices, the s9+ is the better choice as it can suck dirt in between cracks that the i7+ can’t. The s9+ also works extremely well with sand, something many robot vacuums have difficulty with. This makes it perform a lot better than other robot vacuums when deep cleaning medium pile carpets.

Since the s9+ is more powerful than the i7+, it can also suck in hair better without the strands getting caught in the dual brush rolls. As for the i7+, most of the hair it pulls end up in the brush roll so removing the hair should be done more often for optimal cleaning.

Where the i7+ beats the s9+ is when cleaning larger debris. Although the s9+ can still vacuum the floor clean, the i7+ does the job of pulling in bigger dirt more efficiently and with less noise.

Mapping and Navigation

Both the s9+ and i7+ have advanced mapping capabilities, but the s9+ is more efficient

The vSLAM technology detects objects for more intelligent floor mapping

The Roomba s9+ and i7+ are equipped with iRobot’s latest iAdapat 3.0 navigation system and camera-based vSLAM technology. These allow the Roombas to map out your floor plan, detect any obstacles, and learn how to clean the house more efficiently with every use.

Despite having the same technology though, the s9+ performed better than the i7+ in terms of efficiency. As a result, the s9+ can cover a bigger area than the i7+ in one full charge.

Both Roombas can be set up with Keep Out Zones, even without a separate Virtual Wall Barrier. This means you can configure your robot to avoid certain areas that you don’t want your Roomba to clean, such as around pet feeding bowls or sensitive furniture. They can also be used to map your floor plan with the Braava jet m6 robot mops, thanks to iRobot’s Imprint Link technology.

Run, Recharge and Resume

Both the Roomba s9+ and i7+ can dock, recharge, and resume automatically

roomba s9+ vs i7+
These Roombas can automatically resume cleaning where they left off once fully charged

If you have a larger home that the Roomba s9+ and i7+ can’t cover on one go, the robot vacuums will automatically find their cleaning base, recharge, and continue cleaning where they left off. This makes sure that your Roomba covers the whole area within the shortest time possible.

Both Roombas can run for up to 120 minutes on standard mode, shorter when it’s on Carpet Boost mode. Since the Roomba i7+ is fully automatic, you can’t adjust its power, unlike with the s9+ which lets you choose from high or low. To run on a full cycle, both Roombas need to be charged for at least 180 minutes (three hours).

Control Options

The Roomba s9+ and i7+ use the iRobot HOME app and are smart home connected

Both Roombas are compatible with voice assistants

Through the iRobot HOME App, you can control the s9+ and i7+ and schedule cleaning even while you’re away (as long as your phone is connected to WiFi). You can also check out their cleaning history, clean map reports (to determine which areas have been cleaned), and watch videos using the iRobot HOME app.

For a completely hands-free cleaning, you can configure your robot vacuum with either Amazon Alexa or Google Assistant. Since you can save floor maps of your house in the app, you can even ask your Roomba to clean specific parts of the house such as the kitchen or bedroom.

Additional Features

Both the s9+ and i7+ have self-emptying capabilities and High-Efficiency Filters

Vacuums with High-Efficiency Filters are great for families with pets

What makes these high-end robot vacuums a cut above the rest is their self-emptying capabilities. iRobot’s cutting edge Clean Base® Automatic Dirt Disposal made less frequent dust bin emptying possible. When the Roomba docks, the motor in the Clean Base starts sucking in the dirt from the vacuum/s dust bin.

With robot vacuums that don’t have automatic dirt disposal technology, you have to empty the dust bin yourself pretty much after every run. Depending on how often you clean and your floor size, you can forget about emptying the clean base for up to a month or so.

For household members who are prone to allergies, both the Roomba s9+ and i7+ come with iRobot’s High-Efficiency Filters. Their filters can trap dust mite, pollen, mold, and dog and cat allergens. Even their Clean Base is equipped with AllergenLock Bags that lock in allergens to keep your house free of irritants.


The Roomba s9+ is more powerful and worth the price, but the i7+ is still a great buy for those on a lower budget

Its better design, PerfectEdge Technology, much stronger suction power, smarter navigation, and self-emptying capabilities justify the Roomba s9+‘s price. However, if you think the price of the s9+ is a deal-breaker, the Roomba i7+ is a more affordable, yet worthy alternative. The i7+ also comes with Automatic Dirt Disposal, smart navigation, and is still among the top-rated robot vacuums in its class.

Last update on 2021-07-19 / Affiliate links / Images from Amazon Product Advertising API

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Rhodaline Escala-Phelps

Managing Editor and Team Leader at Compare Before Buying. Writer and researcher passionate about people, product comparisons, culture, and current events.