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Roomba j7 VS. s9 – Differences? (With Comparison Chart)

Roomba s9 – the iRobot’s top-end, most powerful, and smartest model.

Roomba j7 – the newest iRobot model with high-level, never seen before AI features.

What are those features? Is Roomba s9’s robust suction outranks everything? How is the Roomba s9 different from the j7 model?

Let’s look into everything in detail (with the main differences and quick summary at first):

Roomba j7Roomba s9
Roomba j7 modelRoomba s9 model
Suction Power: 10X powerful (compared to 600 series)Suction Power: 40X powerful (compared to 600 series)
Navigation: PrecisionVisionNavigation: vSLAM
Detects Pet Waste: YesDetects Pet Waste: No
Hazard Detection: YesHazard Detection: No
Carpet Boost: NoCarpet Boost: Yes
Design: Round-ShapedDesign: D-Shaped
PerfectEdge Technology: NoPerfectEdge Technology: Yes
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Roomba j7

Roomba j7 model

BottomLine: If more extensive carpet cleaning is required, go with the Roomba s9.

Other than that, Roomba j7 is the recommended model for most people, an excellent choice for all types of households (small to large-sized), all floor surfaces.

And for homes with pets, undoubtedly, Roomba j7 is the best-proven model to go.

If auto dust emptying feature is required for you, go with the plus variant of j7, Roomba j7+ (j7+ is nothing but j7 with the self-emptying add-on). Likewise Roomba s9+.

Roomba j7 vs. s9 – Full Comparison Chart

 Roomba j7Roomba s9
Height8.6 cm8.9 cm
Weight3.4 Kg3.7 Kg
Auto RechargeYesYes
Auto ResumeYesYes
Suction10X Powerful (Compared to 600 series)40X Powerful (Compared to 600 series)
Navigation PatternRow By RowRow By Row
Detects Pet WasteYesNo
Hazard DetectionYesNo
Hazard AvoidanceYesNo
Imprint Link TechnologyYesYes
Dirt sensorsYesYes
Cliff sensorsYesYes
Careful DriveNoYes
Carpet BoostNoYes
Multi Surface BrushesYesYes (30% more wider)
Edge Sweeping BrushYesYes
PerfectEdge TechnologyNoYes
Corner cleaning brushNoYes
HEPA filtersYesYes
Zone CleaningYesYes
Keep Out ZonesYesYes
Selective Room CleaningYesYes
Wi-Fi ConnectivityYesYes
App ConnectivityYesYes
Voice CommandsYesYes
Amazon AlexaYesYes
Google AssistantYesYes
Personalized Cleaning RecommendationsYesYes
Self-EmptyingNo (but supports)No (but supports)
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Roomba S9 VS Roomba J7 – Differences, Similarities [In Brief]

Identifying the basics (Design & Dimensions)

Differences in height

Roomba S9 is 8.9 cm tall and manages to get under short furniture like the television cabinet in your living room.

Roomba j7 features a compact size of nearly 8.6 cm tall and conveniently moves under the sofa and other low clearance furniture.

Both robots get to places that were hard to reach and clean them comprehensively. Just run your hand under the cabinet and feel the clean-squeak yourself.

Who weighs more?

At 3.4 kg, Roomba j7 is not too heavy to be carried and moved to another room if you wish to clean it.

Meanwhile, Roomba S9 is just a pinch heavier at 3.7 kg. However, still, you can relocate it across floors or between rooms without tiring yourself.


The S9 is a D-shaped model; it covers more space in a single row than the j7 round-shaped model. The multi-surface dual brushes in s9 are of 30 percent more width when compared to the j7.

Runtime, Auto-recharge & Resume after recharge

The Lithium-ion batteries in Roomba s9 and j7 provide the robot 120 minutes (approx) of cleaning time on total battery capacity.

When a low battery is detected, the robots will automatically travel to their charging bases for recharging. You don’t need to worry about picking them from one corner of your house to their charging base.

Additionally, the recharge and resume feature in Roomba j7 and Roomba s9 guides the robot to recharge themselves when the battery becomes low midway cleaning and resumes mopping or vacuuming when they return to their spots.

Bottom Line: Both are recharge-resume enabled.

Suction Power Variances

40X Powerful Suction
Source: Irobot

Roomba j7 outputs an incredible 10X Powerful suction power (compared to 600 series) when vacuuming the hard floor and carpets in your home.

The cyclone-like scenario created under the j7 model to absorb dirt works tremendously well while the robot navigates your house. Tough stains and stubborn dirt within carpets stand no chance against the suction pressure of the Roomba j7 model.

On the other hand, the Roomba S9 kicks in 40X more suction pressure (compared to 600 series) while vacuuming your house. Forget about pet hair, dust, and tough stains on hard floors and carpets.

Without remorse, the suction pressure of the S9 pulls in dirt from the deepest section of your carpets and removes dust from the tiled or marbled surface of your home.

This suction makes even the caked dirt gets obliterated instantly once the S9 passes over it.

Bottom Line: Roomba S9 is with more powerful suction than the j7 model.

Roomba j7 cleans in a similar pattern (row-by-row) like s9, which is more efficient than the random pattern followed by other low-range models.

But there is something else that makes the j7, only j7, more efficient, more innovative, more problem solving, which is the PrecisionVision Navigation system.

Roomba j7 PrecisionNavigation
Source: Irobot

This j7 model is the first one with this advanced detection. It can detect things like pet waste, power cords, and other obstacles using AI technology and makes your life great, not to bother about any mess when the j7 starts cleaning.

Note: Irobot is making its official promise P.O.O.P (Pet Owner Official Promise) which says that if the purchased j7 model doesn’t detect the pet waste as they said, they will replace the product for free. Make sure to check irobot’s terms and conditions here.

No pre tidy-up is required for this model. The robot takes care of everything.

On the other hand, Roomba S9, the robot navigates using iAdapt 3.0 technology and a vSLAM camera. The combined systems create a predetermined path for the S9 as it navigates your home.

Furthermore, the vSLAM technology of Roomba S9 uses a Contrast Camera to see obstacles and avoids a “bad” path while traveling. As a result, Roomba S9 navigates in a clear line (row-by-row pattern) without bumping into furniture or walls.

The object recognition feature of the S9 is beneficial when the robot needs to plan a concise cleaning path. If a recognized obstacle is in sight, Roomba S9 adopts a new approach done in real-time.

Bottom Line: Both are super intelligent models in navigation and detecting obstacles, but Roomba j7 heads top for pet owners.

Hazard detection

Whenever the Robot detects an obstacle and thinks it is a hazard, it avoids that object in the first run, takes a photo of it, shows you on the app, and asks your input of what to do about that object.

And then, based on your input, it saves that object on the map, and when through the next cleaning cycle, the Robot remembers and follows your guidelines.

Bottom Line: Roomba j7 is with this new feature.


On Roomba S9 and J7 models, there are no included mopping capabilities. You may have to purchase another cleaning device from iRobot to match the mopping prowess of other robot vacuum + mop models.

Bottom Line: Both robots don’t have mopping abilities.

Sensors Technology

The sensors suite in Roomba models is quite remarkable as the robots hosts sensors like cliff sensors and anti-collision sensors.

In both the models, the obstacles avoidance and cliff sensors work well to guide the robots away from furniture and the staircase.

Besides, the models occupy Dirt Detect sensors that recognize high-traffic zones in your home and thoroughly clean the spot by making a few passes.

Talking of the S9 model, advanced 3D sensing technology helps detect objects taller than 2.5cm in real-time and navigates carefully without colliding them. This feature is lacking in the j7 model.

Bottom Line: Roomba S9 stays ahead in sensing technologies.

Carpet Boost Feature

The Roomba S9 will increase its suction pressure to the maximum level because of its carpet-boosting technology while working on carpets and rugs that enhance deeper carpet cleaning.

The rampant suction forces will devour every speck of dirt from the carpet, ensuring a thorough clean. When a hard floor is detected, S9 will revert to its nominal cleaning pressure.

Whereas the Roomba j7 works with similar suction power on all types of floor surfaces.

Bottom Line: Roomba j7 lacks the carpet boost feature.

Multi-Surface Cleaning Brushes

With both models, the dirt extracting brushes are tangle-free and don’t require any post-cleanup, making these models an ultra in saving human efforts.

In Roomba S9, the dual multi-surface rubber brushes work exceptionally well as they are 30% wider and cleans more.

Moreover, the edge-sweeping brush & special corner brush of Roomba S9 is the highlight as it features PerfectEdge technology to deeply clean corners and edges.

As a result, zero dirt and dust at every junction in your house.

Bottom Line: Roomba S9 wins here with its PerfectEdge technology.


Maintaining both robots is easy because you can see their brush statuses, sensor conditions, and filter efficiencies from the simple iRobot Home App.

When the time has come, wipe the sensors and untangle the hair on the rolling brushes. Furthermore, you can quickly check the filters to give them a rinse or replace them in every Roomba model.

And as the dirt grabbing brushes are bristle-free rubber rollers which removes the problem of hair tangling and brush cleaning. From the maintenance point of view, this is a vital asset.

Bottom Line: Both are simple to maintain and use.

Dustbin Capacities

Roomba j7 features a 500-ml dustbin that is entirely washable. On the other hand, the dustbin in Roomba S9 holds 550 ml of dirt and debris.

This means the S9 can work longer without emptying its dustbin, ensuring quicker cleaning time than the j7 model.

But that is not a matter as the 0.5 Liter dustbin size is sufficient enough to clean a large-sized home with lots of dirt in a single cycle.

Bottom Line: Both are similar.

HEPA filters

Both the Roomba S9 and Roomba J7 models are featured with a high-efficiency filter that effectively traps 99% of cat and dog allergens and a HEPA filter.

Unlike the other brands, the filters in Roomba S9 and J7 are not washable, so you need to replace them when they are worn.

Because the genuine HEPA filters are not washable and need to be replaced, only HEPA filter labeled filters are washable. They don’t work well trapping the allergens compared to the HEPA’s in Roomba models.

Read: True HEPA vs HEPA named filters? (Source for better understanding).

Bottom Line: Both are with HEPA filters.

Zone Cleaning

Both robots can clean zones in your home independently without engaging the area outside the cleaning zone.

On Roomba j7 and Roomba S9, you can use the Irobot home app to launch the robots to clean once the zones are marked in the apps.

You can use the Keep Out Zones or Virtual Walls from iRobot Home App to prevent an area from being cleaned.

This helpful feature allows control over which areas of the house you want to be cleaned at all times and which areas to bypass sometimes.

Bottom Line: Both the models are with zone cleaning and keep out zones features.

Selective Room Cleaning

The option to clean only particular rooms in your house is provided in both these Roomba models.

From the mapped layout, select a room and send the robots to clean at the convenience of your fingertips. Moreover, you can plan schedules earlier and let the j7 and S9 initiate work when the time comes.

Bottom Line: Both are with this feature.

Wi-Fi & App Connectivity – Personalized Cleaning Recommendations

Roomba j7 and Roomba S9 support Wi-Fi connection. You can easily connect the j7 and S9 models to your home network using the robots’ apps.

The language selection mode is available in the iRobot home app. In Roomba S9 and J7, the language selection mode appears when you press and hold the DOCK button and select the Languages tab. Listen to every available language and choose the one that suits you.

Wireless firmware upgrade over a Wi-Fi network featured in Roomba j7 and S9. The robots’ OS can be updated by connecting them to your home network and launching their companion apps to initiate the upgrading process

Furthermore, Roomba j7 and Roomba s9 can be combined with Google Assistant and Amazon Alexa for voice-based instructions and hands-free command of intelligent cleaners.

Both models are logically capable of analyzing your cleaning and scheduling habits and recommend you many practical suggestions including the pet-based seasons shedding suggestions.

And with the new iRobot genius addition, you can provide more customized suggestions to the models like when to clean and when not to.

Bottom Line: Both are equally abled in terms of Wi-Fi, app connectivity, and personalized recommendations.

Cleaning Area Comparisons & Barriers Crossing

Roomba s9 can vacuum and clean an area of more than 200 m2 or roughly a size of an average home in a single charge cycle and dust bin capacity.

The same area size is suitable for the Roomba j7 to clean, but it will struggle if the area becomes slightly more extensive.

Yes, both of them can. Barriers like doorsills and thick rugs are easily negotiable for Roomba j7 and Roomba S9. In short, any obstruction that is 2 cm or less is scalable by both robotic cleaners.

Bottom Line: Both are similar.

Imprint Link Technology

Imprint Link technology
Source: Irobot

Suppose you have an iRobot mopping device in your house or looking forward to getting the iRobot mop devices like the braava jet m6.

In that case, there is an extra feature you need to know about when going for a Roomba model like j7 or s9.

The imprint link technology helps the Roomba model works in sync with the mopping model. Shortly after the vacuuming is done, the mop device starts automatically and completes the whole cleaning process.

Bottom Line: Both models support Imprint Link technology.

What about the Self-Emptying? (Roomba j7+ and Roomba s9+)

auto clean base s series

Both the models are not with an auto dust disposal base, which helps empty the bin when complete. But to say, both the models Roomba s9 and j7 support the self-emptying base, which you need to obtain separately.

Or go with the plus variants – Roomba j7+ and Roomba s9+ where auto dust emptying base will come in the box with the same features of j7 and s9.

No need for that extra attachment with plus variants, but yes, the price will be similar. The final price will be nearly the same if you go with the plus models or the normal ones with separate auto-empty dock attachments.

Bottom Line: Both j7 and s9 support the self-emptying base.


Comparison of Roomba j7, s9 models

If the suction pressure is the topmost preference in your necessities table and you don’t have pets in the home (or) you don’t bother regarding the pet waste detection and avoidance when vacuuming, Roomba S9 is the pick.

Besides that, for all others, going with the Roomba j7 model is a smart choice and saves your hard-earned bucks as well.