Roomba s9 vs i7: New Design But Comparable Performance


From the wide range of products by iRobot come the Roomba s9 and Roomba i7. These models come from different series but they’re both good at removing debris without direct control. Even at first glance, you can tell that they’re different robots with the s9 sporting a D-shaped body while the i7 has the classic round design. See what else set these two apart and know which one is right for you.

Roomba s9 VS i7 Comparison Chart

ModelRoomba s9Roomba i7

Width13.34 inches13.31 inches
Height3.63 inches3.62 inches
Weight7.43 lbs7.28 lbs
Rubber ExtractorsYes, 30 percent largerYes
3-Stage CleaningYesYes
Suction (compared to 600 series)40X more suction10X more suction
NavigationiAdapt 3.0 with vSLAM iAdapt 3.0 with vSLAM
MappingImprint Smart Mapping w/ smart sensorsImprint Smart Mapping

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While the Roomba i7 retains the traditional circular design, the Roomba s9 deviates from that with a D-shaped body.

Roomba s9 body
The Roomba s9 has a new D-shaped body

Roomba i7 design
The Roomba i7 has a traditional round body

Round and glossy, the Roomba i7 has the aesthetics that you would expect from a typical robot vacuum. The Roomba s9, however, has a design not found in any of its predecessors or siblings. If you look at it from above, it is shaped like a capital letter D; round on one side and straight on the other. They’re both roughly 13.3 inches wide and 3.6 inches high although the s9 is slightly heavier.

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Debris Extractors

Both the Roomba s9 and Roomba i7 have rubberized extractors but those on the s9 are bigger.

roomba s9 suction
The Roomba s9 rollers are located in the front
Roomba i7 rollers
The Roomba i7 rollers are located in the middle

Roomba rubber brushes are normally placed in the middle of the body as is the case in the Roomba i7. These have been relocated to the front in the Roomba s9. Because they are no longer sandwiched by the wheels, they are made 30 percent larger than older brush rolls resulting in a wider cleaning path. This potentially leads to larger floor space covered in one cleaning session.

Edge Cleaning

With its D-shaped body, the Roomba s9 is better at cleaning along edges and deep in corners.

roomba s9 perfectedge
The Roomba s9’s D-shaped body enables it to clean corners and edges

PerfectEdge Technology is unique to the Roomba s9 and s9+ due to their design. PerfectEdge features advanced sensors and a specially designed Corner Brush with five arms to reach debris in corners and edges. It also has smaller bristles so it can capture finer particles. The round body of the Roomba i7 makes it miss areas where it won’t fit.


Featuring superior 3-Stage Cleaning Systems, the Roomba s9 and Roomba i7 offer improved cleaning performance but the s9 does much better.

The AeroForce technology found in the Roomba s9 and Roomba i7 leave AeroVac and Roomba 600 models in the dust, literally and figuratively. The i7 delivers ten times more air power with its power-lifting suction. But then, the s9 promises forty times the suction for pulling in embedded debris. Whether that has a visible effect on performance remains to be seen.

Navigation & Mapping

The Roomba s9 and Roomba i7 use a combination of iAdapt 3.0 Navigation, vSLAM, and Imprint Smart Mapping to get their way around.

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roomba s9+ app
The Roomba s9 and Roomba i7 can map an entire level of your home so you can control where they clean

iAdapt and vSLAM together allow the Roomba s9 and Roomba i7 to navigate around your home effortlessly. Imprint Smart Mapping helps the robots to adapt to the layout, enabling you to control which rooms you want cleaned and when. Smart sensors in the s9 also scan the area up to 25 times per second to check for obstacles. The digital maps resulting from these are easily accessible on the iRobot Home app.


The Roomba s9 has a wider cleaning path, greater suction capability and new body-style but these don’t really add enough extra value to justify the price tag. Meanwhile, the Roomba i7 delivers comparable performance even without extra features at a more competitive price level.

The Roomba s9 offers cutting-edge technology but that doesn’t necessarily make it a stronger contender against the Roomba i7. The i7 is just as convenient and easy to use but you won’t have to spend as much for the same level of cleaning performance. This makes the i7 the clear winner against the s9.

Last update on 2020-01-28 / Affiliate links / Images from Amazon Product Advertising API