iRobot Roomba j9+ vs Roborock S8 Pro 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 — #12 overall

7.9/10

$1,099

Roborock S8 Pro Ultra is the clear winner, outscoring iRobot Roomba j9+ by 1.8 points. However, iRobot Roomba j9+ has 45% cheaper.

Criteria	Weight	iRobot Roomba j9+	Roborock S8 Pro Ultra
Total Score	—	6.1/10	7.9/10
🗺️Navigation & Obstacle Tech	2x	85%	88%*
💨Suction Power	1x	85%	85%
📐Edge Cleaning	1x	75%	85%*
💇Tangle-Free Rollers	1x	85%	88%*
🧹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%	88%
📦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%	90%*
Price	—	$599	$1,099
Pros		+Trusted iRobot brand +Excellent camera-based avoidance +Strong pet hair pickup +Easy rubber brush maintenance	+Proven reliability +Dual rubber brushes +6,000 Pa suction +Sonic mopping vibration
Cons		-No mopping capability -Slightly weaker in corners -Less cutting-edge than competitors	-Older than S8 MaxV Ultra -No AI obstacle camera -Large dock
Suction		4,000 Pa	6,000 Pa
Navigation		Camera + AI Avoidance	LiDAR
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
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