iRobot S9 Vs S9+ Detailed Comparison: Are There Any Differences?

Your purchases through our links may earn us a commission at no extra charge to you. Read more

The Irobot Roomba S9 series, including the iRobot S9 vs S9+, was unveiled in the last quarter of 2019 and is advertised as the smartest, most powerful robot vacuum yet. Well, while time and technology have moved on, they remain popular and offer a range of high-end features. But how are they different?

The “Plus” for the S9+ only involves the automatic dirt disposal base that comes with it. Both models share similar performance features like high airflow, strong suction, smart navigation, and a D-shaped design for better corner cleaning. But when the iRobot S9+ finishes a cleaning cycle, it returns to its dock and automatically empties its dustbin into a bag in the dock. The iRobot S9, on the other hand, requires manual emptying of the dustbin.

iRobot S9 Vs S9+: Comparison Chart

Image
#1 WINNER
iRobot Roomba s9+ Self Emptying Robot Vacuum - Empties Itself for 60 Days, Detects & Cleans Around Objects in Your Home, Smart Mapping, Powerful Suction, Corner & Edge Cleaning
#2 RUNNER-UP
iRobot Roomba S9 (9150) Robot Vacuum- Wi-Fi Connected, Smart Mapping, Powerful Suction, Works with Alexa, Ideal for Pet Hair, Works with Clean Base
Model
iRobot S9+
iRobot S9
Dimensions (W x H)/Weight
12.25 x 3.5 inches/8.15 lbs
12.25 x 3.5 inches/8.15 lbs
Shape
D-Shaped
D-Shaped
Number of Maps
10
10
Live Map
Navigation Technology
vSLAM Camera-Based Technology
vSLAM Camera-Based Technology
Self-Empty
Obstacle Avoidance
Scheduled Cleaning
CCTV Function
Extractor & Side Brush
2 x Rubberized Rollers/1 x 5-Prong Brush
2 x Rubberized Rollers/1 x 5-Prong Brush
Dust Tank Capacity
0.5 Litert
0.5 Litert
Filter
HEPA
HEPA
Recharge & Resume
Run Time/Charging Time
120 minutes/2 hours
120 minutes/2 hours
Mopping
What I Like
Price
$989.95
$999.99
#1 WINNER
Image
iRobot Roomba s9+ Self Emptying Robot Vacuum - Empties Itself for 60 Days, Detects & Cleans Around Objects in Your Home, Smart Mapping, Powerful Suction, Corner & Edge Cleaning
Model
iRobot S9+
Dimensions (W x H)/Weight
12.25 x 3.5 inches/8.15 lbs
Shape
D-Shaped
Number of Maps
10
Live Map
Navigation Technology
vSLAM Camera-Based Technology
Self-Empty
Obstacle Avoidance
Scheduled Cleaning
CCTV Function
Extractor & Side Brush
2 x Rubberized Rollers/1 x 5-Prong Brush
Dust Tank Capacity
0.5 Litert
Filter
HEPA
Recharge & Resume
Run Time/Charging Time
120 minutes/2 hours
Mopping
What I Like
Price
$989.95
More Info
#2 RUNNER-UP
Image
iRobot Roomba S9 (9150) Robot Vacuum- Wi-Fi Connected, Smart Mapping, Powerful Suction, Works with Alexa, Ideal for Pet Hair, Works with Clean Base
Model
iRobot S9
Dimensions (W x H)/Weight
12.25 x 3.5 inches/8.15 lbs
Shape
D-Shaped
Number of Maps
10
Live Map
Navigation Technology
vSLAM Camera-Based Technology
Self-Empty
Obstacle Avoidance
Scheduled Cleaning
CCTV Function
Extractor & Side Brush
2 x Rubberized Rollers/1 x 5-Prong Brush
Dust Tank Capacity
0.5 Litert
Filter
HEPA
Recharge & Resume
Run Time/Charging Time
120 minutes/2 hours
Mopping
What I Like
Price
$999.99
More Info

iRobot S9 Vs S9+: Differences

Both are the same in terms of powerful suction, D-shaped design, and smart mapping, among others. The only difference is that the “Plus” version comes with a self-cleaning base. Naturally, the cost of the “Plus” version is higher, but it’s worth it!

Cleaning Performance

Hard Floor≈ 99%
Low-pile Carpet≈ 99%
High-pile Carpet≈ 99%

As expected, the S9 delivered outstanding cleaning performance, achieving near-perfect results on all three types of flooring tested. These impressive results can be attributed to its potent combination of powerful suction, a broad dual-roller system, and a uniquely designed D-shaped frame.

5-inch Strands≈ 89%
10-inch Strands≈ 78%

The S9 wasn’t exactly great at picking up hair on my floor, but in return, its twin-roller system was very good at preventing tangles. Plus, these rollers were conveniently designed for easy disassembly, facilitating hassle-free detangling.

a significant amount of hair gets caught in the edge of the roller
A significant amount of hair gets caught in the edge of the roller

Design & Usability

Dimensions & Weight

Dimensions (W x H)12.25 x 3.5 inches
Weight8.15 lbs
the s9 is the first and only roomba bot with a d-shaped design
The S9 is the first and only Roomba bot with a D-shaped design

The S9 is the first Roomba with a D-shaped design. The unique design is particularly effective for reaching corners, edges, and tight spaces where dust and debris tend to accumulate. Meanwhile, traditional round-shaped robots often struggle to clean these areas effectively because their shape inherently leaves gaps.

the s9 is very good at cleaning edges
The S9 is very good at cleaning edges

The straight edge allows this one to align itself flush against walls and get right into corners, providing a more thorough clean. Adding to this, a 5-arm edge brush enables the bot to sweep debris away from walls and into the cleaning path.

the edge brush
The edge brush

Moreover, the D-shaped design allows for larger dual main brush rollers located at the straight edge instead of between the wheels, which can result in more effective cleaning and potentially better pick-up of debris.

the s9 features dual rubberzied brushes
The S9 features dual rubberzied brushes

Navigation

The iRobot S9 uses vSLAM, a camera-based technology, to capture its surroundings and build a map that it can then use for navigation. One of the advantages of this approach is that the bot has a lower profile compared to LIDAR-based models, which have a raised turret on top to house the laser scanning unit. 

Of course, a lower profile allows the S9 to more easily navigate under furniture and other low-hanging obstacles, which is particularly useful for homes with lots of furniture or other potential obstructions. Sadly, the advantages of this visible-based navigation technology over vSLAM stop there!

the vslam camera on the s9
The vSLAM camera on the S9

The first limitation is that it depends heavily on light to function properly and effectively. Much like the difference between a mediocre and a magnificent photograph often lies in the quality of lighting, so too does the efficacy of vSLAM hinge on this factor. The S9’s built-in camera requires adequate lighting, especially during its initial mapping runs through your home.

Moreover, it required a minimum of four cleaning cycles for the S9 to fully map my home’s layout. I wasn’t in a rush to have my robotic helper perfect its tasks on the first go, but most LIDAR-equipped bots I’ve tested, like the Roborock S7 Max, could indeed accomplish this feat.

Well, this one could remember up to 10 floor plans, so cleaning a multi-level home isn’t a problem with it. The only manual labor involved is lifting the device up or down the stairs, as it is still unable to sprout legs and ascend staircases on its own.  If that day ever comes, count me thrilled, of course. And it is worth noting that the S9 doesn’t have a front-facing camera, so it cannot avoid obstacles like the Roomba J7+.

Battery Life

Battery Life≈ 63–112 mins
Charging Time≈ 196 mins

The Irobot S9 uses a 5200 mAh Lithium-ion battery. I don’t know about you, but the battery capacity of a robot vacuum may not always be the most critical factor to consider for me, especially for models like the iRobot S9 that have the ability to return to their charging stations automatically when the battery is low. There is an LED light on the top of its body that notifies you of the current battery status, with the light going from white to red when its battery level is low.

Control

Manual Control

The S9 offers both app control and Alexa compatibility for remote control, but what if you lose your WiFi connection for some reason? Don’t worry – it features three physical buttons for start/finish cleaning, spot cleaning, and sending the bot home.

the s9 offers three buttons for manual control
The S9 offers three buttons for manual control

The spot-cleaning function is really a huge time-saver since it focuses the S9 on a small area, thereby preserving battery life for other tasks. This is a game changer if you accidentally spill something in the kitchen or if your cats just left a mess in the bedroom.

App Connectivity

Connecting the Roomba S9 to WiFi using the free iRobot app is a breeze, as the app itself isn’t complicated at all, although it will take you some time to get used to all the features it offers. First off, you can divide rooms and name each as you see fit. You can even name your bot, which is handy if you have two on different floors (though this may not be necessary as this one can memorize up to 10 floors, as mentioned earlier).

The S9 offers compatibility with Alexa and Google Home, although this feature isn’t immediately evident—it’s tucked away under a tab named “Smart Home.” Once you’ve successfully linked the devices, however, you can effortlessly command the bot to start a cleaning cycle, tackle a specific room, or retreat to its charging station. The option to change the suction level is also stuck in the settings instead of being conveniently placed on the main interface.

The app also supports “keep out” and “clean” zones, where you draw boxes around areas that you want your bot to bypass or focus on. You can also check past cleaning sessions and schedule cleanings for your bot. However, one conspicuous absence is a Live Map feature, which would enable you to monitor the bot’s real-time movements.

Cleaning & Maintenance

The addition of a self-cleaning base in the “Plus” version of the iRobot S9 is one such feature that offers a hands-off experience and substantially enhances convenience. 

the self-cleaning base
The self-cleaning base

Why? A self-cleaning base means the robot vacuum can empty its own dustbin, so it can also run for longer periods without requiring human intervention. This is particularly useful for larger homes or for people who prefer to schedule multiple cleaning sessions when they are not around. A self-emptying feature can also mean less exposure to dust and allergens when you don’t have to empty the bin manually. This could be a significant advantage for allergy sufferers.

 All the accumulated dust and debris are channeled into a relatively large single-use bag. This eliminates the need for daily emptying of its 500-ml dust bin – you can simply replace the dust bag on a weekly or even monthly basis. After all, we want a robot to reduce manual labor, don’t we?

Other Features

Noise

Working≈ 63-72 dB
Self-Emptying≈ 74 dB

The S9 is fairly noisy compared to other robots. especially when it’s on the max setting, but the biggest negative with it is how loud it gets when self-emptying. So I recommend keeping the clean base in a less-frequented area to avoid startling your loved ones or pets.

Mopping Ability

These robots are versatile in all aspects except mopping. If you’re interested in a complete cleaning solution, you might consider pairing the S9 with the Braava M6 mop robot. By linking the two through the “Imprint Link” tab in the iRobot app, the Braava M6 will automatically commence mopping as soon as the S9 finishes vacuuming.

the roomba s9+ and braava m6
The Roomba s9+ and Braava M6

Quick Rundown Of iRobot S9+

iRobot Roomba s9+ Self Emptying Robot Vacuum - Empties Itself for 60 Days, Detects & Cleans Around Objects in Your Home, Smart Mapping, Powerful Suction, Corner & Edge Cleaning
7,013 Reviews
iRobot Roomba s9+ Self Emptying Robot Vacuum - Empties Itself for 60 Days, Detects & Cleans Around Objects in Your Home, Smart Mapping, Powerful Suction, Corner & Edge Cleaning
  • CLEANS UP AFTER YOU AND ITSELF: With groundbreaking technology and a sophisticated design, the s9 plus is one of the smartest, most powerful robot vacuum yet. With 40x the suction power, the superior 3-Stage Cleaning System lifts, loosens, then eliminates debris and pet hair from deep within your carpets for a clean you won’t believe — with no effort from you. It automatically increases suction to clean even deeper into carpets with power boost technology
  • DETAILED POWERFUL CLEAN: PerfectEdge Technology with advanced sensors and a specially designed Corner Brush, this vacuum offers optimized cleaning deep into corners and along edges. The approximately 30% wider Dual Rubber Brushes then Roomba 600 series don't get tangled with pet hair making it ideal for homes with pets. With vSLAM navigation, the s9 plus learns the layout of your home and builds personal Smart Maps, enabling it to expertly clean and navigate in neat, efficient rows
  • VACUUMS MESSES IN THE MOMENT: Cleaning crumbs is now as easy as “Roomba, clean under the kitchen table.” A simple request to your voice assistant or via the iRobot Home app enables the s9 plus to clean messes for you, right when they happen — immediately clean that spot and consider it done. The updated iRobot Home App allows you to upgrade your overall cleaning experience
  • COMPLETE CONTROL: With Smart Mapping, your robot knows your kitchen from your living room, so you can decide where it cleans and when. And with Keep Out Zones, your robot knows to avoid sensitive areas like pet bowls or play areas. The Roomba s9 plus robot vacuum is smarter than ever, learning where and when you normally clean and suggesting personalized schedules so you can focus on everything else
  • DREAM TEAM OF CLEAN: With Imprint Link Technology, the Roomba s9 plus robot vacuum and Braava jet m6 robot mop (available separately) team up to vacuum then mop automatically in perfect sequence, giving your floors a comprehensive clean with just a command to your voice assistant or in the app
Pros
  • Voice control via Amazon Alexa and Google Assistant.
  • Self-emptying dustbin is included.
  • Smart mapping and navigation.
  • Easy to control via the iRobot app.
  • Remember up to 10 layouts.
Cons
  • Can’t detect and avoid obstacles.
  • Mediocre battery life.

Quick Rundown Of iRobot S9

iRobot Roomba S9 (9150) Robot Vacuum- Wi-Fi Connected, Smart Mapping, Powerful Suction, Works with Alexa, Ideal for Pet Hair, Works with Clean Base
  • DEEPEST CLEAN - With 40X the suction power, the superior 3-Stage Cleaning System lifts, loosens, then eliminates debris & pet hair from deep within your carpets. Increases suction to clean even deeper into carpets with power boost technology.
  • DETAILED POWERFUL CLEAN - PerfectEdge Technology with advanced sensors & a specially designed Corner Brush optimize cleaning deep into corners & along edges. Ideal for homes with pets. 30% wider Dual Rubber Brushes don't get tangled with pet hair.
  • GUIDED BY SERIOUS SMARTS - With vSLAM navigation, the s9 learns the layout of your home & builds personal Smart Maps, enabling it to expertly clean & navigate in neat, efficient rows. If it’s running low on battery, it recharges & resumes cleaning.
  • VACUUMS MESSES IN THE MOMENT - Cleaning crumbs is now as easy as “Roomba, clean under the kitchen table.” A simple request to your voice assistant or via the app enables the s9 to clean messes for you, right when they happen.
  • COMPLETE CONTROL OF YOUR CLEAN - With Smart Mapping, your robot knows your kitchen from your living room, so you can decide where it cleans & when. & with Keep Out Zones, your robot knows to avoid sensitive areas like pet bowls or play areas.
Pros
  • Voice control via Amazon Alexa and Google Assistant.
  • Smart mapping and navigation.
  • Easy to control via the iRobot app.
  • Remember up to 10 layouts.
  • More affordable price.
Cons
  • No self-emptying base.
  • Can’t detect and avoid obstacles.

Product Videos

Related Articles to Roomba S9 Plus

  1. iRobot Roomba I3 Vs S9+: A Detailed iRobot Vacuum Comparison
  2. Roomba S9+ Vs Roborock Q5: Which One Should You Get?
  3. Roborock Q5+ Vs Roomba S9+: Which is the Best Bang for the Buck?
  4. Ecovacs Deebot T9+ Vs Roomba S9+: A Duel Between Two Workhorses
  5. iRobot Roomba S9+ Vs Shark IQ: Which One Is Better?
  6. iRobot Roomba S9+ Vs Dyson 360 Heurist: A Detailed Comparison
  7. Deebot X1 Omni Vs Roomba S9+: A Side-By-Side Comparison
  8. Roborock S7 Vs Roomba S9+: An Honest Review And Detailed Comparison
  9. Roomba J7+ Vs S9+: Is the J7+ Really a Worth-The-Money Upgrade?

Related Articles to Roomba S9

  1. Comparing The Roborock S7 Vs iRobot S9: Which Prevails?
  2. iRobot Roomba 980 Vs S9: A Detailed Comparison
  3. A Detailed Face-Off Competition Of Roborock S8 Vs Roomba S9
  4. An Ultimate Guide to Deciding Between The Neato D10 Vs Roomba S9
  5. iRobot S9 Vs Shark IQ Robot: Which One Has My Vote?
  6. iRobot I7 Vs S9: Which High-End iRobot Roomba is Better?
  7. Dyson 360 Heurist Vs Roomba S9 Robot Vacuum Detailed Comparison
  8. Roborock S7 MaxV Vs iRobot S9: A Head-To-Head Comparison

References:

5/5 - (1 vote)

Leave a Comment