iRobot Roomba S9: Specs, Features, Pros & Cons
This review measures the iRobot Roomba S9 against the full 38-spec sheet we track for Robot Vacuums, comparing it like for like with the 37 other models in our database. It earns a VS Score of 45 out of 100 — the weighted result of every verified specification measured against the class average.
On the spec sheet it is strongest in maintenance & filtration and weakest in cleaning. Its clearest single advantage over the class average: 1.61 mm less height — 95 mm vs 96.61 mm (avg). None of our retail partners currently lists the iRobot Roomba S9, so availability may be limited; a missing price never affects the VS Score. A transparency note: this spec sheet is 53% complete. Anything unverified shows as Unknown and is left out of the score — we never estimate a missing value.
Category strengths
Where the iRobot Roomba S9 beats the average
- Has HEPA filter ?
- Has edge-cleaning extension ?
- Has mapping ?
- 1.61 mm less height ?95 mm vs 96.61 mm (avg)
Where the iRobot Roomba S9 trails the average
- No mopping ?
- 53.57 min less runtime ?120 min vs 173.57 min (avg)
- 2,157.69 mAh less battery capacity ?3,300 mAh vs 5,457.69 mAh (avg)
- No washable filter ?
- 4.91 mm less threshold clearance ?19 mm vs 23.91 mm (avg)
Editor’s note
The S9 is the Roomba shaped like a D rather than a circle, and everything interesting about it follows from that.
A round robot can never quite reach into a corner — the geometry does not allow it, which is why a room cleaned by one keeps a faint outline of dust in the angles. The S9's flat front lets the brush run right up to the join, and it adds an extending edge-cleaning arm to sweep debris out of the corner and into the path. If skirting boards and corners are what bother you about robot vacuums, this is the design that addresses it directly.
The rest is capable rather than current. Navigation is camera-based vSLAM with mapping, no-go zones and room-by-room cleaning — effective in daylight, weaker in the dark than the LiDAR machines here. There is a HEPA filter, dual rubber anti-tangle brushes, carpet detection and recharge-and-resume, with 120 minutes from a 3,300 mAh battery.
Two things to weigh. The filter is not washable, so it is a consumable. And it does not mop, and at 95 mm tall it will be stopped by low furniture that an 80 mm machine clears.
Buy it if corners and edges are the specific thing you want solved and you clean during the day. Buy a LiDAR machine if it will run at night, or a Combo model if mopping is on the list.
Specifications
Quality bars are generated automatically against 37 other robot vacuums.
Cleaning
Higher suction lifts more dirt from carpets and hard floors.
Also mops hard floors.
The physical mopping system used by the robot.
Lifts the mop over carpet to avoid soaking it.
Automatically recognises carpet and adapts suction or mopping behaviour.
Extends a side brush or mop closer to walls and into corners.
The available cleaning modes.
How much floor it can cover on one charge.
The main brush design (e.g. anti-tangle rubber).
Navigation
How it maps and navigates; LiDAR is the most precise.
Builds and saves a map of your home.
How many floor maps it stores.
Detects and avoids objects and cables.
Set virtual walls and keep-out areas in the app.
The tallest doorway lip or threshold the robot can climb.
Battery & dock
A larger battery runs longer between charges.
How long it cleans on a full charge.
Returns to charge, then finishes where it left off.
Empties its bin into the dock automatically.
The dock refills clean water and drains dirty water.
The dock washes and dries the mop pads.
The dock can detach the mop pads before vacuum-only or carpet cleaning.
The maximum published hot-water temperature used to wash the mop.
The maximum published warm-air temperature used to dry the mop.
The dock automatically doses cleaning solution.
Detects dirty wash water or floor stains and automatically re-washes or re-mops.
Design
A lower profile fits under more furniture; lower is better.
A larger onboard bin needs emptying less often.
The onboard clean-water capacity for mopping.
Quieter operation is less disruptive; lower is better.
Smart features
Control and schedule it from a phone app.
Works with Alexa and Google Assistant.
Set cleaning schedules.
Send it to clean specific rooms or zones.
Maintenance & filtration
A high-efficiency filter captures fine dust and allergens.
The onboard filter can be rinsed and reused.
The brush design reduces wrapped hair and manual cleaning.
Mop pads can be removed for cleaning or replacement.
How the VS Score works — and what it can’t tell you
Every measurable spec is scored against the average of all the Robot Vacuums we track: matching the class average scores 50, clearly beating it climbs towards 100, and each spec counts according to an editorial weight that reflects real-world impact — a battery-capacity gap moves the score far more than a colour-options list. The quality bars on the spec cards above show where this model sits inside the full range for its class, and the overall VS Score rolls every weighted result into one number.
Unknown values are never estimated. A spec this product doesn’t report simply drops out of its scoring — it isn’t penalised with a guess — but a thinner spec sheet does mean a score built on fewer data points, which is why completeness is disclosed under About this data.
Most importantly: a spec-sheet lead is not the same as a better product. Megapixels, gigahertz and benchmark points describe capacity, not experience — image processing, software optimisation, thermals, haptics and ergonomics decide how a device actually feels, and no table captures reliability or long-term support quality. Treat the VS Score as a structured summary of what can be measured, not a substitute for your own priorities.
About this data
- Specifications are compiled from each manufacturer’s official spec sheet, cross-checked against trusted specification databases, and normalised into one schema so identical things are compared identically.
- Specifications last verified July 24, 2026.
- Data completeness: 20 of the 38 specs in this category are verified (53%). Anything we could not verify is shown as Unknown — never estimated — and is excluded from the score.
- Prices and availability come from live retailer feeds via our shopping partners and refresh throughout the day; a missing price means no partner currently lists the product, not that it is discontinued.
- Want the full picture? Our editorial guidelines explain how we research products, weight the scores and stay independent.
- Spotted an error in a spec? Tell us and we will correct the sheet.
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The bottom line
The iRobot Roomba S9 earns a VS Score of 45, a solid mid-pack result among the 38 robot vacuums we compare here. It stands out for has HEPA filter, has edge-cleaning extension and has mapping. Just be aware of no mopping and 53.57 min less runtime before you buy. Weigh those trade-offs against what matters most to you.
The VS Score is generated automatically from the weighted specifications above, measured against all other robot vacuums in our database. Treat it as a shortlisting guide — not a substitute for your own priorities.
