iRobot Roomba j9+ vs Roborock S8 MaxV Ultra

A detailed side-by-side comparison scored on 14 objective criteria with weighted scoring (max 12 points).

iRobot Roomba j9+

iRobot — #28 overall

6.1/10

$599

WINNER

Roborock — #8 overall

8.1/10

$899

Roborock S8 MaxV Ultra is the clear winner, outscoring iRobot Roomba j9+ by 2.0 points. However, iRobot Roomba j9+ has 33% cheaper.

Criteria	Weight	iRobot Roomba j9+	Roborock S8 MaxV Ultra
Total Score	—	6.1/10	8.1/10
🗺️Navigation & Obstacle Tech	2x	85%	92%*
💨Suction Power	1x	85%	90%*
📐Edge Cleaning	1x	75%	88%*
💇Tangle-Free Rollers	1x	85%	85%
🧹Mop System	1x	0%	85%*
🔥Mop Drying	0.5x	0%	85%*
🧴Integrated Soap	0.5x	0%	80%*
🔄Mop Versatility	0.5x	0%	50%*
🗑️Auto-Empty Reliability	1x	88%	90%*
📦Bin Capacity	0.5x	80%	85%*
⏱️Refill Frequency	0.5x	85%	85%
🧗Obstacle Mobility	1x	35%	40%*
📏Low Clearance	0.5x	60%*	45%
📱App Quality	1x	82%	92%*
Price	—	$599	$899
Pros		+Trusted iRobot brand +Excellent camera-based avoidance +Strong pet hair pickup +Easy rubber brush maintenance	+Excellent value when on sale ($899) +Strong all-around performer +LiDAR + AI camera avoidance +Matter smart home support
Cons		-No mopping capability -Slightly weaker in corners -Less cutting-edge than competitors	-Large dock requires space -Mopping not quite as good as Matrix10 -MSRP is expensive ($1,799)
Suction		4,000 Pa	6,000 Pa
Navigation		Camera + AI Avoidance	LiDAR + Camera + AI Avoidance
Mop Type		None	Sonic + Auto-Wash
Self-Empty		Yes (60 days)	Yes (60 days)
Runtime		120 min	180 min
Mobility
Obstacle Climbing		Standard	Standard
Retractable LiDAR		No	No
Adaptive Chassis		No	No
Multi-Mop Switch		No	No
		Check Price Full Review	Check Price Full Review