Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Roborock - Qrevo Master | iRobot - Roomba j9+ |
|---|---|---|
| Battery life | 180 min | 200 min |
| Noise | 64 dB | 68 dB |
| Mopping | true | false |
| Lidar | true | false |
| Suction | 10000 Pa | 0 Pa |
| Water tank | 250 ml | 0 ml |
Between the Qrevo Master and Roomba j9+, the Qrevo Master comes out ahead in noise / mopping, while the Roomba j9+ wins on battery life. Overall, the Qrevo Master scores 81.3 and the Roomba j9+ scores 45.9 on our Mars Score.
Which should you buy?
The Qrevo Master is the clear pick on raw spec strength, leading by 35.4 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 / mopping. The biggest gaps in its favor are noise, mopping, lidar, among others. The single most decisive one: Noise — 4.00 dB less. 64 vs 68.
Pick the Roomba j9+ if you care most about battery life. Its strongest claims are battery life. The single most decisive one: Battery life — 11.11% more. 200 min vs 180 min.
Both ship with comparable self-empty base, ai obstacle avoidance, so those specs do not 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.
Which should you buy: Roborock - Qrevo Master or iRobot - Roomba j9+?
Roborock - Qrevo Master leads the current Mars Score by 35.4 points.The more useful decision is the trade-off behind that result: compare suction, battery life, mopping against the way you will actually use the product.
Choose Roborock - Qrevo Master if…
Roborock - Qrevo Master has the measurable edge on noise db, has mopping, has lidar.
Choose iRobot - Roomba j9+ if…
iRobot - Roomba j9+ has the measurable edge on battery life min.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
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.