Between the Qrevo Master and Roomba j9+, the Qrevo Master comes out ahead in noise and mopping, while the Roomba j9+ wins on battery life. Overall, the Qrevo Master scores 64.9 and the Roomba j9+ scores 49.8 on our Mars Score.
Which should you buy?
The Qrevo Master is the clear pick on raw spec strength, leading by 15.1 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Qrevo Master if you care most about noise and mopping. The biggest gaps in its favor are noise, mopping, lidar, among others.
Pick the Roomba j9+ if you care most about battery life. Its strongest claims are battery life.
Both ship with comparable self-empty base, ai obstacle avoidance, so those specs don't separate the two — focus on the differences below.
Bottom line: the Qrevo Master is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Roborock - Qrevo Master wins
- ▲Noise — 4.00 dB less. 64 vs 68.
- ▲Has Mopping.
- ▲Has Lidar.
- ▲Suction: 10000 Pa vs 0 Pa.
- ▲Water tank: 250 ml vs 0 ml.
Why iRobot - Roomba j9+ wins
- ▲Battery life — 11.11% more. 200 min vs 180 min.
Spec comparison
Cleaning
| Spec | Roborock - Qrevo Master | iRobot - Roomba j9+ |
|---|---|---|
| Suction | 10000 Palead | 0 Pa |
| Mopping | truelead | false |
| Water tank | 250 mllead | 0 ml |
| Dustbin | 300 ml | 500 mllead |
| Carpet detection | true | true |
Navigation
| Spec | Roborock - Qrevo Master | iRobot - Roomba j9+ |
|---|---|---|
| Lidar | truelead | false |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 25 mmlead | 20 mm |
Autonomy
| Spec | Roborock - Qrevo Master | iRobot - Roomba j9+ |
|---|---|---|
| Battery life | 180 min | 200 minlead |
| Self-empty base | true | true |
| Self-wash mop | truelead | false |
| Self-dry mop | truelead | false |
| Noise | 64 dBlead | 68 dB |
Frequently asked
Which has stronger suction, Qrevo Master or Roomba j9+?+
Qrevo Master delivers 10000 Pa vs 0 Pa.
Do Qrevo Master or Roomba j9+ mop?+
Qrevo Master mops; Roomba j9+ vacuums only.
Which has a self-emptying base, Qrevo Master or Roomba j9+?+
Both ship with a self-emptying base.
Spec-level deep dives
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