iRobot Roomba j9+ vs Roborock S8 Max 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 — #5 overall

8.4/10

$1,599

Roborock S8 Max Ultra is the clear winner, outscoring iRobot Roomba j9+ by 2.3 points. However, iRobot Roomba j9+ has 63% cheaper.

Criteria	Weight	iRobot Roomba j9+	Roborock S8 Max Ultra
Total Score	—	6.1/10	8.4/10
🗺️Navigation & Obstacle Tech	2x	85%	94%*
💨Suction Power	1x	85%	92%*
📐Edge Cleaning	1x	75%	92%*
💇Tangle-Free Rollers	1x	85%	88%*
🧹Mop System	1x	0%	88%*
🔥Mop Drying	0.5x	0%	90%*
🧴Integrated Soap	0.5x	0%	85%*
🔄Mop Versatility	0.5x	0%	60%*
🗑️Auto-Empty Reliability	1x	88%	92%*
📦Bin Capacity	0.5x	80%	88%*
⏱️Refill Frequency	0.5x	85%	88%*
🧗Obstacle Mobility	1x	35%	45%*
📏Low Clearance	0.5x	60%*	45%
📱App Quality	1x	82%	94%*
Price	—	$599	$1,599
Pros		+Trusted iRobot brand +Excellent camera-based avoidance +Strong pet hair pickup +Easy rubber brush maintenance	+10,000 Pa HyperForce suction +FlexiArm side brush reaches edges +Hot water mop washing (60°C) +Excellent AI obstacle avoidance
Cons		-No mopping capability -Slightly weaker in corners -Less cutting-edge than competitors	-Premium price -Large dock footprint -Incremental update over S8 MaxV
Suction		4,000 Pa	10,000 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