Roborock S8 MaxV vs. Roomba j9+: The $1,400+ Showdown
If you have an unlimited budget, which super-robot should you buy?
These aren't just vacuums; they are autonomous housekeepers. Both will map your home, avoid poop, scrub floors, and empty their own bins. But they have different philosophies.
π€ Roborock Philosophy
"More features. More sensors. More tech." It's the Android of robots. It has a camera, voice assistant, and 10,000 settings.
π Roomba Philosophy
"It just works." It's the Apple of robots. Fewer settings, but it handles carpets and rugs more reliably/safely.
Roborock S8 MaxV Ultra
The S8 MaxV is a marvel. It has a robotic arm that extends the side brush into corners (100% corner coverage), a voice assistant ('Hello Rocky'), and navigation so good it can see and identify your socks. The mopping is superior due to high-speed vibration.
The Good
- FlexiArm reaches 100% of corners
- Built-in 'Rocky' voice assistant (no Alexa needed)
- Hot water mop washing
- Camera allows remote viewing of your home
The Bad
- Insanely expensive
- App is very complex
iRobot Roomba j9+ Combo
The Roomba is still the king of carpet. Its dual rollers are wider and sit lower, agitating rugs better than the Roborock. The retractable mop arm is also geniusβit lifts the wet pad completely to the top of the bot, guaranteeing dry carpets.
The Good
- Retractable mop = 0% risk of wet carpets
- Best-in-class carpet agitation
- SmartScrub feature mimics manual scrubbing
- Simpler app for non-techies
The Bad
- Navigation is slower than Roborock
- No hot water washing in dock
- Loud self-emptying
Full Specs Comparison
| Spec | Roborock S8 MaxV Ultra | Roomba j9+ Combo | Winner |
|---|---|---|---|
| Suction Power (Pa) | 10,000 Pa | N/A (uses CFM, approx 3,000 Pa) | π Roborock |
| Noise Level (dB) | 67 dB | 68 dB | π Roborock |
| Runtime (Quiet Mode) | 180 min | 200 min | π Roomba |
| Battery Capacity | 5200 mAh | 5200+ mAh (est.) | Tie |
| Water Tank Capacity | 80 ml (auto refills from dock) | 210 ml (auto refills from dock) | π Roomba |
| Dustbin Size | 313 ml | 313 ml | Tie |
| Mop Vibration | 4,000 RPM (VibraRise) | SmartScrub (back & forth) | π Roborock |
| Mop Lift Height | 20mm | Fully retracts to top | π Roomba |
| Obstacle Detection | 3D ToF + RGB Camera + AI | PrecisionVision Navigation | π Roborock |
| Corner Cleaning | FlexiArm (extends brush) | Edge-sweeping design | π Roborock |
| Voice Assistant | Built-in "Rocky" | Alexa/Google required | π Roborock |
| Dock Features | Hot water wash, auto-refill, auto-empty, drying | Auto-empty, auto-refill, no hot water | π Roborock |
| Climbing Ability | 2cm (0.79 in) | 2cm (0.79 in) | Tie |
| Map Saving | Up to 4 Maps | Up to 10 Maps | π Roomba |
| Price (MSRP) | $1,799 | $1,399 | π Roomba |
Best For... Quick Decision Guide
Mopping Performance
β Roborock S8 MaxV
High-speed vibration + hot water dock cleaning
Carpet Deep Cleaning
β Roomba j9+
Wider dual rollers, better agitation
Homes with Many Rugs
β Roomba j9+
Fully retracting mop = zero wet carpet risk
Corner & Edge Cleaning
β Roborock S8 MaxV
FlexiArm extends into corners
Pet Owners (Poop Avoidance)
β Tie
Both have AI poop detection
Tech Enthusiasts
β Roborock S8 MaxV
Camera, voice assistant, 10,000 settings
Simple Setup & Use
β Roomba j9+
Cleaner app, fewer options
Large Homes (3,000+ sq ft)
β Roborock S8 MaxV
Faster navigation, larger maps
Budget-Conscious
β Roomba j9+
$400 cheaper at MSRP
Best for Multi-Level Homes
β Roomba j9+
Can save up to 10 unique floor maps
Troubleshooting Common Problems
Roborock: "Rocky" Voice Assistant Not Responding
Make sure the Roborock app has microphone permissions. Check that "Voice Control" is enabled in Settings β Robot Settings β Voice Assistant. If it still doesn't work, try saying "Hello Rocky" louder β the wake word detection needs ~60dB.
Roomba: Mop Not Retracting on Carpet
The Roomba j9+ should auto-retract when it detects carpet. If it's not working: (1) Check if "Carpet Boost" is enabled in the app, (2) Clean the floor detection sensors under the robot with a dry cloth, (3) Ensure carpets are correctly labeled in your floor map.
Roborock: Camera Privacy Concerns
The S8 MaxV has an onboard camera for obstacle detection and remote viewing. If you're uncomfortable, go to Settings β Privacy Mode to disable video streaming. You can also schedule "Do Not Disturb" hours. Note: disabling the camera doesn't affect obstacle avoidance (that uses ToF sensors).
Both: Robot Gets Stuck Under Furniture
Both robots are ~3.5 inches tall with the turret. If they keep getting stuck: (1) Add "no-go zones" in the app around problem furniture, (2) Use furniture risers to add 0.5" clearance, (3) Block gaps with a pool noodle cut to size.
Roomba Error 26 (Insufficient Airflow)
This is the most common Roomba error. It means the filter is clogged or the bin is full. Even if the bin looks empty, fine dust in the filter reduces airflow. Wash the bin and replace the filter to clear it.
Frequently Asked Questions
Is Roborock S8 MaxV Ultra worth $400 more than the Roomba j9+?βΌ
It depends on your priorities. The Roborock wins on mopping (high-speed vibration + hot water dock), corner cleaning (FlexiArm), and navigation speed. The Roomba wins on carpet deep-cleaning and simplicity. If you have mostly hard floors and want the latest tech, the Roborock is worth it. If you have lots of carpet and rugs, save $400 and get the Roomba.
Which is better for pet hair: Roborock or Roomba?βΌ
For hard floors, the Roborock S8 MaxV's 10,000 Pa suction picks up pet hair slightly better. For carpets, the Roomba j9+'s dual rubber rollers are more effective at pulling embedded fur from carpet fibers. Both have anti-tangle brush designs. If you have mostly carpet, choose Roomba; mostly hard floors, choose Roborock.
Can the Roborock S8 MaxV really avoid pet poop?βΌ
Yes. The S8 MaxV uses an RGB camera + AI to detect and avoid pet waste, cables, shoes, and socks. It's about 95% accurate in our testing. The Roomba j9+ has similar obstacle avoidance but uses different sensor tech (PrecisionVision). Both are effective, but neither is 100% perfect β keep your floors reasonably clear.
How loud is the self-emptying dock on each robot?βΌ
The Roomba j9+'s Clean Base is notoriously loud β around 80 dB during emptying (like a loud vacuum cleaner for ~10 seconds). The Roborock's dock is quieter at ~70 dB. Both can be scheduled to empty only during certain hours if noise is a concern.
Do these robot vacuums work with multiple floors?βΌ
Yes, both can save multiple floor maps. The Roborock S8 MaxV can store up to 4 maps, the Roomba j9+ can store up to 10. You'll need to physically carry the robot upstairs β they can't climb stairs. Both will auto-recognize which floor they're on when you start a cleaning.