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- Roomba Combo j9+ vs S8 MaxV Ultra
iRobot Roomba Combo j9+ vs Roborock S8 MaxV Ultra
What Roomba Combo j9+ does better (4) and where S8 MaxV Ultra wins (5) — every spec side by side.
vs
2.6Navigation7.6
5.0Mopping7.7
2.7Base station5.4
5.8Battery7.4
Dimensions
Size comparison
Roomba Combo j9+S8 MaxV Ultra
| Roomba Combo j9+ | S8 MaxV Ultra | Difference | |
|---|---|---|---|
| Height | 87 mm | 103 mm | −16 mm |
| Width / diameter | 348 mm | 353 mm | −5 mm |
| Length | 348 mm | 353 mm | −5 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is Roomba Combo j9+ better than S8 MaxV Ultra?
- Water tank (robot)210 ml vs 100 ml2.1×
- Height87 mm vs 103 mm+18%
- Charging time180 min vs 240 min+33%
- Dustbin (robot)313 ml vs 270 ml+16%
Why is S8 MaxV Ultra better than Roomba Combo j9+?
- Obstacle avoidanceBasic sensors (infrared / bumper) vs AI camera
- Mop typeMop pad vs Vibrating / sonic mop
- Base stationAuto-empty dock vs All-in-one dock (empty + wash)
- Battery capacity4,500 mAh vs 5,200 mAh+16%
- Clean water tank (dock)3 l vs 4 l+33%
Specifications
Side by side
| Suction & cleaning | ||
| Suction power | — | 10,000 Pa |
| Dustbin (robot) | 313 ml | 270 ml |
| Main brush | Dual main brushes | Dual main brushes |
| Side brushes | 1 | 1 |
| Extending side brush | — | Yes |
| Carpet detection | Yes | Yes |
| Dirt detection | Yes | Yes |
| Noise level | — | 67 dB |
| Navigation & obstacles | ||
| Navigation | — | Laser (LiDAR) |
| Navigation sensors | Cliff sensors | LiDAR laser (LDS), Wall sensor, Cliff sensors |
| Obstacle avoidance | Basic sensors (infrared / bumper) | AI camera |
| Threshold climbing | — | 20 mm |
| No-go zones / virtual walls | — | Yes |
| Room mapping & room selection | Yes | Yes |
| Mopping | ||
| Mop type | Mop pad | Vibrating / sonic mop |
| Mop lifting on carpets | Yes | Yes |
| Mop lift height | — | 20 mm |
| Extending mop (edges) | — | Yes |
| Water tank (robot) | 210 ml | 100 ml |
| Base station | ||
| Base station | Auto-empty dock | All-in-one dock (empty + wash) |
| Auto-empty dust station | Yes | Yes |
| Dust bag (dock) | — | 2.5 l |
| Mop washing in the dock | — | Yes |
| Hot-water mop washing | — | Yes |
| Hot-air mop drying | — | Yes |
| Automatic water refill | Yes | Yes |
| Clean water tank (dock) | 3 l | 4 l |
| Battery & runtime | ||
| Battery capacity | 4,500 mAh | 5,200 mAh |
| Runtime | — | 180 min |
| Charging time | 180 min | 240 min |
| Cleaning area per charge | — | 300 m² |
| Recharge & resume | Yes | Yes |
| Size & weight | ||
| Width / diameter | 348 mm | 353 mm |
| Length | 348 mm | 353 mm |
| Height | 87 mm | 103 mm |
| Weight | 4.1 kg | — |
| Shape | Round | Round |
| Colours | Black, Gold | Black |
| App & smart home | ||
| App control | Yes | Yes |
| Voice assistants | Amazon Alexa, Google Assistant, Apple Siri | Amazon Alexa, Google Assistant, Apple Siri |
| Live camera view / video call | — | Yes |
| Remote control | — | Yes |
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