Roomba j7/j7+ vs. s9/s9+ Specifications, Performance, Price

Last updated on April 15th, 2024

We are comparing the top models from the j and s series of iRobot – j7+ and s9+. Each model is unique in its own way. There’s also a significant difference in price between the two series. We are here to find out which will benefit us more. Is investing the extra money in the s9+ worth it, or will the j7+ do just fine? Read along to find out.

Which is better: Roomba j7/j7+ vs. s9/s9+?

The j7+ has enhanced navigation capabilities with its front-facing camera and hazard-detection feature. In comparison, the s9+ gives better cleaning performance, especially around the corners. Its high suction power and airflow, combined with the PerfectEdge technology, provide the ultimate cleaning experience.

Hence, it isn’t easy to choose between the j7+ and s9+, as each has its unique set of features.

Read a similar article: Roomba j7/j7+ vs. Roborock q5/q5+ – Key Features and Differences

What does the ‘+’ indicate?

The j7 and s9 have enhanced versions known as the j7+ and s9+. The ‘+’ versions are equipped with a self-emptying dock, a feature absent in the original models. This self-emptying dock allows the vacuums to automatically empty their dustbins into a spacious bag within the dock. It thus eliminates the need for manual emptying whenever the dustbin becomes full.

Roomba j7/j7+

Roomba j7 / j7+
Roomba j7+

Both Roomba j7+ and j7 were launched in September 2021. They are the first iRobots to have a front-facing camera. All other models had a top-facing camera. This change in positioning enabled iRobot to give a Hazard detection feature and a Pet Owner Official Promise.

Roomba s9/s9+

Roomba S9 /S9+
Roomba s9+

The Roomba s9+ and s9 came on the market in May 2019. Surprisingly, they were launched two years before the j7 and j7+. It is the first set of iRobots to have a D-shaped body. It is equipped with the PerfectEdge technology designed for better cleaning of corners and edges.

Roomba j7/j7+ vs. s9/s9+ Specs Compared

Specifications of Roomba J7/j7+ vs Roomba s9/s9+
Specifications of Roomba j7/j7+ vs. s9/s9+

The below table compares all these vacuums

SpecsRoomba j7+Roomba s9+
Dimensions13.3 x 13.3 x 3.4 inches12.25 x 12.25 x 3.5 inches
Weight7.49 Pounds8.15 Pounds
ShapeCircleD shape
ColorCharcoal GreyCharcoal Grey
Surface RecommendationCarpets, Hard floorsCarpets, Hard floors
Cleaning OptionsVacuumingVacuuming
Control TypeVoice, AppVoice, App
Compatible DevicesAmazon Alexa,
Google Assistant
Amazon Alexa,
Google Assistant
BrushesDual Multi-Surface
Rubber Brushes,
Edge-Sweeping Brush
Dual Multi-Surface
Rubber Brushes,
Edge-Sweeping Brush
CameraFront facingTop facing
Dustbin Capacity0.5 L0.5 L
Battery Capacity2210 mAh3300 mAh
Runtime100 mins75 mins
Charging Time2 hours3 hours
Battery TypeLithium IonLithium Ion
Suction Power10x*40x*
Airflow8 CFM25 CFM
Warranty1 year1 year
Automatic Dirt Disposal SystemPresentPresent
Smart Mapping TechnologyPresentPresent
vSLAM TechnologyPresentPresent
PrecisionVision NavigationPresentPresent
PerfectEdge TechnologyAbsentPresent
Virtual Wall BarrierPresentPresent
Cliff SensorPresentPresent
Hazard DetectionPresentAbsent
3-Stage Cleaning SystemPresentPresent
Dirt Detection TechnologyPresentPresent
P.O.O.P. (Pet Owner Official Promise)PresentAbsent
Real-Time Video Call FeatureAbsentPresent
Number Of Maps Saved310
Extra HEPA FilterPresentPresent
Extra Side Sweeping BrushPresentPresent
Roomba j7/j7+ vs. s9/s9+ Comparison

* indicates comparison with the 600 series.

Let’s discuss how these models differ from one another.

Which Roomba has a better design?

The s series robots are iRobot’s first couple of vacuums to have a D Shape. The D Shape helps in better cleaning of corners and edges as it can easily adapt to its shape. iRobot went on a limb here to replace the traditional round shape. The j series models also have a classic round shape.


There’s not much difference in the size of these vacuums, but the j7+ is lighter at 7.49 pounds than the 8.15 pounds of the s9+. This doesn’t really affect their performance, so it should not be a factor when choosing between the j and s series.


One major difference between their designs is the placement of the camera. The j series is the first iRobot to have a front-facing camera. Even the j7+ has a front-facing camera. With this new placement, iRobot hoped to achieve a better sense of navigation in the vacuums and succeeded at it. The s9 and s9+ have regular top-facing cameras.

Self-emptying bin

Another major difference between these vacuums is that only the j7+ and s9+ have Automatic Dirt Disposal Systems. They come with a Clean Base that has self-emptying capability. You have to empty the dustbins of the j7 and s9 manually.

Though the j7+ has a front-facing camera, the s9+ has a more innovative design.

Battery Performance: Roomba j7/j7+ vs. s9/s9+

All these vacuums possess a similar Lithium Ion battery. The only difference is in their capacities. The j7+ has a 2,210 mAh battery, which takes around 2 hours to charge. While the s9 and s9+’s 3,300 mAh battery takes about 3 hours.

Why does the s9+ have a short runtime despite high battery capacity?

Now, even with a greater battery capacity, the s9/s9+ fails to give a better runtime. The j7+ can run for 100 minutes, but the s9+ can run for only 75 minutes. This can be explained by the higher suction power of the s9/s9+. Due to that, it requires more power for cleaning than a robot usually does.

So even if the s9+ has higher battery capacity, we recommend opting for the j7+ for its longer runtime.

All these vacuums have a few navigation technologies in common. The vSLAM Technology and PrecisionVision Navigation allow these vacuums to map the area they are cleaning, encounter and avoid obstacles, and leave no part unvacuumed. These technologies work in combination with the aid of the mounted camera and other sensors.

The Cliff Sensor, also known as the Cliff Detection Sensor, is the most vital one as it prevents the vacuums from falling down the stairs. All these robots have the ability to set up Virtual Wall Barriers. With these barriers, the vacuum will avoid those spots and clean them.

These were the common navigation technologies in all Roombas. Now comes the differences.

Hazard Detection

The j7+ has a unique Hazard Detection feature. It detects out-of-the-ordinary objects around your house and informs you if it finds any. You will receive a hazard alert on your iRobot app, along with a picture of the potential hazard. You can then categorize the object as hazardous or non-hazardous.

PerfectEdge Technology

On the other hand, the s9/s9+ has PerfectEdge Technology. The main element of this tech is the design of these models. Unlike the circular models, the D shape facilitates enhanced cleaning in corners and edges as it can easily reach them.

Clearly, the j7+ has enhanced navigation and obstacle detection capability than the s9/s9+ due to its front-facing camera.

Which Roomba cleans better?

All Roombas in this article are top models from iRobot. Without a doubt, they all have exceptional cleaning abilities. But it comes down to who does it better. We believe suction power and airflow play a vital role in vacuuming performance.

Suction power and airflow

In that aspect, the s9+ clearly has an advantage as it has 40x* suction power and 25 CFM airflow. But the j7+ has merely 10x* suction power and 8 CFM airflow. This gives the s9/s9+ a better ability to pick up debris.

(* indicates comparison with the 600 series.)

Cleaning techs

All these vacuums follow the traditional 3-Stage Cleaning System. They are also equipped with the same Dirt Detection Technology. But the above factors set them apart.

Even though all Roombas have the same cleaning technologies, the higher suction power and more excellent airflow make the s9+ stand out from the rest.

Additional features

Pet Owner Official Promise

The j7+ gives the P.O.O.P. (Pet Owner Official Promise), which the s9+ doesn’t. This promise implies that the Roomba will detect pet poop and immediately notify you with its Hazard Detection feature. If the robot fails to do so, the company will replace that model with a new one.

Live feed

On the other hand, the s9+ allows you to monitor the live feed of your Roomba’s camera anytime during its cleaning cycle. This way, you can see exactly what’s happening around your house. This serves as an excellent surveillance mechanism if you are away from the house.

What’s in the box?

You get the following accessories when you buy these robot vacuums.

Roomba j7+Roomba s9+
1 Robot Vacuum1 Robot Vacuum
1 Clean Base Automatic Dirt Disposal1 Clean Base Automatic Dirt Disposal
1 Power Cord1 Power Cord
2 AllergenLock Bags2 Dirt Disposal Bags
1 Extra Filter1 Extra High-Efficiency Filter
1 Extra Edge-Sweeping Brush1 Extra Corner Brush
What’s in the box?

Advantages of Roomba j7/j7+ vs. s9/s9+

Advantages of Roomba j7+/j7 vs Roomba S9+/S9
Advantages of Roomba j7/j7+ vs. s9/s9+

The table below shows the advantages of both vacuum robots.

Roomba j7+ AdvantagesRoomba s9+ Advantages
CheaperCompact size
LightweightD Shape
Longer runtimeHigher battery capacity
Lower charging timeMore suction power and airflow
Hazard DetectionPerfectEdge Technology
P.O.O.P. (Pet Owner Official Promise)Real-Time Video Call Feature
Roomba j7/j7+ vs. s9/s9+ Advantages


We have discovered that each Roomba brings its own set of features to the table. We highly recommend getting the ‘+’ versions as the self-emptying bin saves a lot of time and workforce. With j7+, you will get enhanced navigation; with s9+, you get better cleaning performance. You can choose which model better fulfills your requirements. We personally are more inclined towards the s9+ for its unique design and PerfectEdge Technology, but it goes on a higher budget side.


When was Roomba s9+ released?

The Roomba s9+ was released in May 2019.

Is the Roomba j7+ worth it?

The Roomba j7+ offers an intense cleaning experience. Its state-of-the-art navigation system, along with its auto-emptying features, makes it worth every penny.

Is the Roomba s9+ good for dog hair?

Roomba s9+ has 40x* suction power, which makes it extremely good at picking up minute debris, even dog hairs.

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Siddhi Gurav

She is the editor and content writer at Smart Home Bulls. Siddhi merges her passion for language with SEO expertise. With 4 years of experience as a creative writer and a passion for smart home technology, she fits in perfectly at Smart Home Bulls. Her wide experience in content marketing has been an excellent addition to our team.

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