Roomba j9+ Review 2026: Double the Suction of the j7+, One Missing Feature

Quick Answer: The Roomba j9+ is iRobot’s step up from the j7+, and the upgrade is real: iRobot rates it at 100% stronger suction than its older i-Series robots — roughly double the j7+‘s power — and Vacuum Wars confirmed the gain in hands-on testing. The new Dirt Detective feature learns which rooms get dirtiest and automatically boosts suction and cleaning passes there. The catch, per Vacuum Wars: the Combo j9+ still doesn’t wash its own mop pad, a feature rivals from Roborock and Dreame already offer. List price is $899 (vacuum-only), commonly discounted to $499–$599 on Amazon. Buy it for meaningfully better suction and smarter re-cleaning than the j7+; skip it if self-washing mop hygiene is your priority.

The j7+ built its reputation on camera-based obstacle avoidance alone, coasting on that one trick for four years while its suction fell behind the field. The j9+ is iRobot’s answer to the suction complaint — same PrecisionVision navigation, same pet-waste avoidance, but rated at double the cleaning power and a new feature that tries to clean smarter, not just harder.

Roomba j9+ by the numbers

• $899 list price (vacuum-only, model J955020), though it’s commonly discounted to $499–$599 on Amazon — a real-world savings of 30–45% off list.
• 100% stronger suction than iRobot’s Roomba i-Series, per iRobot — confirmed as a real gain, not just a marketing number, in Vacuum Wars’ hands-on testing.
• Roughly 2x the j7+‘s suction, per iRobot’s own comparison materials.
• ~25 minutes for initial mapping and cleaning cycles that ran about 10 minutes longer than competing flagships, per Vacuum Wars.
• Up to 60 days between emptying, thanks to the Clean Base self-empty dock sealing debris in an AllergenLock bag, per iRobot.

What’s actually new: Dirt Detective and real suction gains

The headline spec is suction, and it’s a genuine improvement rather than a rounding error. iRobot states the j9+ delivers “100% stronger suction” than its i-Series robots, which lines up with the roughly 2x figure iRobot’s own materials use when comparing it directly to the j7+. Vacuum Wars’ independent testing backed up the claim with confirmed performance gains on both carpet and hard floors — a meaningful jump from the j7+‘s “very low suction and airflow” showing in the same testers’ prior review.

The second real addition is Dirt Detective, powered by iRobot OS. It learns from a home’s cleaning history and automatically prioritizes rooms that tend to get dirtier, adjusting suction strength and the number of cleaning passes without you having to set custom room profiles by hand. It’s the first Roomba feature that adapts its cleaning intensity room-by-room based on actual usage data rather than a flat setting applied everywhere.

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The gap that’s still open: mop-pad hygiene

Here’s the honest trade-off. The Combo j9+ — the mopping variant — adds a new Smart Scrub pattern that Vacuum Wars measured as roughly twice as effective on tough, dried-on stains (their test used dried grape juice) compared to a standard mopping pass. That’s a real win for one-pass cleaning power. But Vacuum Wars also flagged what the dock still doesn’t do: it never washes or dries the mop pad. The Clean Base refills the water tank and empties the vacuum bin, but the same pad gets reused across a cleaning run without a rinse cycle — a feature that premium docks from Roborock and Dreame have offered for several product generations already.

Worth knowing too: iRobot has retrofitted the Smart Scrub pattern back onto the Combo j7+, so that specific feature is no longer j9-exclusive. If mopping muscle was the only reason you were considering the step up, the price gap over the Combo j7+ buys you suction and Dirt Detective, not exclusive access to Smart Scrub.

Who should buy the Roomba j9+

• Buy it if you want a genuine suction upgrade over the j7+ and want Dirt Detective’s automatic room-prioritizing.
• Buy it if you can find it near its typical $499–$599 street price rather than the $899 list.
• Buy it if pet-waste avoidance is a must-have and you also want stronger raw cleaning power than the j7+ delivers.
• Skip it if self-washing mop-pad hygiene is your priority — the Combo j9+ still lacks it, and rivals from Roborock and Dreame already offer it.
• Skip it if the j7+‘s discounted price and the same PrecisionVision avoidance already meet your needs — the suction gap matters most on heavy carpet and pet-hair loads, less on light everyday upkeep.

How it compares

Against its own predecessor, the Roomba j7+, the j9+ fixes the single biggest complaint independent testers had — weak suction — while carrying over the same camera-based pet-waste avoidance that made the j7+ a recommended pick despite its age. Against LiDAR-based rivals covered in our Roomba vs Roborock comparison, the j9+ narrows iRobot’s suction gap but still trails Roborock’s top MaxV models on raw Pa ratings and self-washing dock features. If mopping hygiene rather than suction is your deciding factor, our best robot vacuum and mop guide covers docks that do wash their own pads.

The bottom line

The Roomba j9+ is proof iRobot listened to the j7+‘s biggest weakness. Suction is meaningfully better — a real, testing-confirmed gain rather than a marketing number — and Dirt Detective adds genuine smart re-cleaning the j7+ never had. But the Combo variant’s mop pad still doesn’t wash itself, a gap rivals have already closed, and cleaning cycles run a bit slower than competing flagships. At its typical $499–$599 street price, it’s the easy step up from the j7+ for anyone who found that model’s suction lacking; if mop hygiene matters more than suction, look at a rival with a self-washing dock instead.

Check today’s Roomba j9+ price on Amazon →