iRobot
iRobot Roomba j9+
$899
Released 2023
Best Robot Vacuums · head-to-head
iRobot Roomba j9+ vs Roborock S8 MaxV Ultra
A sourced, side-by-side comparison. Roborock S8 MaxV Ultra is cheaper at $799.99. Every spec and price links to its source.
Roborock
Roborock S8 MaxV Ultra
$799.99Cheaper
Released 2024-04
Which is better: the iRobot Roomba j9+ or Roborock S8 MaxV Ultra?
On the specs we track, they're closely matched. The Roborock S8 MaxV Ultra is the cheaper at $799.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | iRobot Roomba j9+ | Roborock S8 MaxV Ultra |
|---|---|---|
| US price | $899 | $799.99 |
| Brand | iRobot | Roborock |
| Released | 2023 | 2024-04 |
| Suction (Pa) | — | 10000 |
| Mapping | Imprint Smart Mapping (camera-based PrecisionVision Navigation) | PreciSense LiDAR Navigation |
| Self empty | Yes | Yes |
| Mopping | No | Yes |
| Battery min | — | 180 |
| Obstacle avoidance | PrecisionVision Navigation — recognizes and avoids pet waste, cords, shoes, socks | Reactive AI 2.0 — 3D structured light + RGB camera, 73 object types recognized |
| App | iRobot Home | Roborock |
| Release | 2023 | 2024-04 |
Sources — iRobot Roomba j9+: irobot.com (verified 2026-06-15). Roborock S8 MaxV Ultra: us.roborock.com (verified 2026-06-15).
What's the difference between the iRobot Roomba j9+ and Roborock S8 MaxV Ultra?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Mapping: iRobot Roomba j9+ Imprint Smart Mapping (camera-based PrecisionVision Navigation) vs Roborock S8 MaxV Ultra PreciSense LiDAR Navigation
- Mopping: iRobot Roomba j9+ false vs Roborock S8 MaxV Ultra true
- Obstacle avoidance: iRobot Roomba j9+ PrecisionVision Navigation — recognizes and avoids pet waste, cords, shoes, socks vs Roborock S8 MaxV Ultra Reactive AI 2.0 — 3D structured light + RGB camera, 73 object types recognized
- App: iRobot Roomba j9+ iRobot Home vs Roborock S8 MaxV Ultra Roborock
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
iRobot Roomba j9+
Only one whitelisted tester (TechHive) reviewed the exact vacuum-only Roomba j9+, hands-on with no lab bench numbers; it earned Editors' Choice for strong cleaning and obstacle avoidance. Other major reviews (Tom's Guide, TechRadar, Engadget) cover the mop-hybrid Combo j9+, a different config, so were excluded here. (1 sourced review.)
Praised: Excellent obstacle detection and avoidance, including pet waste; Strong vacuuming pickup, including heavy pet hair without roller tangling; Dirt Detective prioritizes the dirtiest rooms automatically.
Flagged: PrecisionVision navigation depends on ambient light (won't clean in the dark); Many app controls buried in sub-menus.
Roborock S8 MaxV Ultra
Two whitelisted hands-on reviews (TechRadar, TechHive) agree the Roborock S8 MaxV Ultra vacuums very well but mops only decently. TechRadar praises reliable suction across debris sizes; TechHive reports excellent hard-floor pickup and 100% rice removal on carpet. Neither ran a weighed lab bench, so no measured percentages are recorded. Both note mopping is mixed and that the product is expensive. TechRadar additionally flags an unreliable voice assistant and poor corner pickup by the extending brush. (2 sourced reviews.)
Praised: Strong, reliable vacuuming performance across hard floors and carpet with different debris sizes; Intuitive Roborock app with extensive customization options; Excellent obstacle avoidance and fast, accurate mapping (~10 min map).
Flagged: Mopping only mixed; vibrations can't lift embedded/dried-on dirt; Expensive (TechHive: $1,799.99 for the reviewed config); Voice assistant unreliable at basic approved commands.