iRobot Roomba i3+ vs Roomba S9+

Further down the page, you’ll find some explanations regarding the key similarities and differences between the iRobot Roomba i3+ and the Roomba S9+.

But before checking out explanations regarding their design, cleaning performance, battery, and feature, here’s a table that summarizes the main technical summary sheet for these 2 robot vacuums:

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Design Comparison

Roomba i3+ measures 13.34 x 13.26 x 3.63 inches and weighs 15 pounds. Meanwhile, the Roomba S9+ measures 12.25 x 12.25 x 3.5 inches and weighs 8.2 pounds.

iRobot Roomba i3+ Robot Vacuum

Cleaning Performance Comparison

Suction Power & Noise

With a suction capacity of 1800 Pa, Roomba i3+ has a noise level of 68 dba. The Roomba S9+ has a suction power of 2200 Pa and a noise level of 65 dba.

Robot’s ability to walk

With a cleaning area of 170 m2, Roomba i3+ has a smaller cleaning area than Roomba S9+, with a cleaning area of 200 m2.

Thanks to the 20 mm (0.78 in) climbing ability, both of them are suitable for thicker carpets and can easily overpass a door threshold (if below 2 cm).

Both robots are equipped with a bunch of sensors that prevent bumping into things, falling, and keeping them at a distance of 10 mm from walls and furniture.

Dirt treatment

iRobot Roomba i3+ and Roomba S9+ both have dirt detection sensors. It is a system that recognizes high-traffic spots making a cleaner go over these zones a few times until it is clean

With a 500 ml dustbin capacity, the iRobot Roomba S9+ can hold a little more dirt than the Roomba i3+, which has a capacity of 400 ml.

When the dustbin inside the Roomba gets full, the robot vacuum returns to the charging dock, the base sucks up the debris from the container. When the Roomba is done emptying, it returns to continue cleaning. The base holds up to 30 robot’s bins, so you don’t have to empty it for about a month.


Under the lids of both dustbins, there is a HEPA filter that makes the robot safe for people with allergies and asthma. The filters of both Roomba are not removable for washing, you should change the filter every three months.

Ability to suck and sweep

Carpet boost: Roomba S9+ has a sensor that can recognize carpets. When the vacuum is on the carpet, its suction power is increased to the maximum level automatically cleaning deeper.

Side brush: Both have a side brush made of rubber.

Unique Dual Multi-Surface Rubber Brushes don’t get tangled with pet hair. Brushes adjust and flex to stay in constant contact with carpets and hard floors.

Cleaning Brush: Both are equipped with a cleaning brush that has detachable tips and is easier to clean since hair mostly gets clogged around the edges. In addition, the newest brush has 250% more bristles providing a better pickup.

Ability to Mop the floor: Both devices can only sweep and vacuum

iRobot Roomba S9+ Robot Vacuum

Battery Comparison

With 1800 mAh Lithium-Ion, Roomba i3+ can operate for about 75 minutes and takes 90 minutes to charge. Roomba S9+ uses a Lithium-Ion battery with a capacity of 3300 mAh that can work for about 120 minutes and takes 240 minutes to fully charge.

If both vacuums don’t finish all the work on a single charge, it will automatically return to the charging dock. Resume intends that the robot will resume from where it left off after charging is complete. This feature is perfect for large households where the robot cannot clean the entire house on a single charge

Feature Comparison


Unlike robots that don’t have a map and move randomly until the battery runs out, Roomba navigates efficiently. It moves back and forth in straight lines methodically covering the cleaning area based on the map it generates.

Roomba S9+ uses a camera sensor to map your home layout; the Roomba i3+ uses a gyroscope + optic motion tracking sensor. The camera suffers in dark rooms.

Roomba i3+ cannot store maps in memory. Roomba S9+ can store 10 different maps in memory.

Schedule activities

The Roomba i3+ only has basic scheduling features. You can only schedule it to work at a specific time and day of the week.

Roomba S9+ has an advanced scheduling feature. After mapping, you can divide the map into separate regions and give each area a name. With this feature, you can schedule cleaning by area, no-go zone, selected room cleaning, schedule, etc.

Roomba i3+ does not have a digital virtual wall creation feature but you can buy an additional virtual wall barrier to create a no-go zone.. meanwhile, Roomba S9+ is equipped with a digital virtual wall creation feature that helps create a no-clean zone, Zoned cleaning.

Zoned cleaning: The robot cleans within a particular zone

No-Go zone: keeps the Roomba off some zones

Room cleaning: can be ordered (or scheduled) to clean in a certain room or two.


Manually control it like a radio car. If you need the device to go to a specific spot, you can use the app remote control and manage its movements by sending it where you want to. Also, with the «Target Point» option you can tap on the map, and the robot will go to that place. Much easier than using the remote control.

Additionally, you can control the two robot vacuums by setting voice prompts through Amazon Alexa Support and Google Assistant Assistant.

Activity tracking

When Roomba finishes cleaning, you can view the results in the cleaning history. Both cannot be tracked in real-time, you cannot see its location while the robot is vacuuming.

Quick Rundown Of iRobot Roomba i3+

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  • Short charging time
  • Create a cleanup map but cannot store the cleanup map
  • Advanced cleaning cannot be programmed

Quick Rundown Of iRobot Roomba S9+

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  • Large cleaning area
  • Strong attraction
  • Large battery capacity
  • Real-time tracking is not possible

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