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iRobot Roomba j9+ vs Roborock S8 MaxV Ultra: Spec Comparison (2026)
Quick Winner Summary
Buy the Roborock S8 MaxV Ultra if: You want carpet_lift, obstacle_avoid, premium and premium features justify the higher price.
Buy the iRobot Roomba j9+ if: You want excellent performance with better value, saving $500 while still getting low_profile and pet_waste_avoid capabilities.
Side-by-Side Spec Comparison
| Feature | iRobot Roomba j9+ | Roborock S8 MaxV Ultra |
|---|---|---|
| Price | $1,099 | $1,599 |
| Year Released | 2026 | 2025 |
| Suction Power | 10,000 Pa | 10,000 Pa |
| Battery Life | 120 minutes | 180 minutes |
| Navigation | vSLAM Camera | PreciSense LiDAR |
| Bin Capacity | 400 ml | 400 ml |
| Noise Level | 70 dB | 67 dB |
| Mopping System | No mopping | VibraRise 3.0 |
| Obstacle Avoidance | PrecisionVision AI | RGB camera + 3D |
| Mapping | Smart mapping | Reactive 3D |
| Height | 8.7 cm | 9.7 cm |
| Width | 33.9 cm | 35 cm |
| Self-Emptying | Yes | Yes |
| Carpet Boost | Yes | Yes |
| HEPA Filter | Yes | Yes |
| Voice Control | Alexa, Google, Siri | Alexa, Google |
| Warranty | 1 year | 2 years |
| Best For | low_profile, pet_waste_avoid, brand_trust | carpet_lift, obstacle_avoid, premium |
Suction Power Comparison
The Roborock S8 MaxV Ultra delivers 10,000Pa of suction, compared to 10,000Pa for the Roborock S8 MaxV Ultra.
Real-world impact: Both models perform well on most surfaces. The 0Pa difference becomes noticeable on high-pile carpets and embedded debris.
Navigation and Mapping
The iRobot Roomba j9+ uses vSLAM Camera navigation with Smart mapping mapping capabilities. The Roborock S8 MaxV Ultra features PreciSense LiDAR with Reactive 3D mapping.
Obstacle avoidance: iRobot Roomba j9+ offers PrecisionVision AI, while Roborock S8 MaxV Ultra provides RGB camera + 3D.
Price and Value Analysis
The iRobot Roomba j9+ costs $1,099, while the Roborock S8 MaxV Ultra is priced at $1,599—a $500 difference.
The iRobot Roomba j9+ offers better value for budget-conscious buyers, while the Roborock S8 MaxV Ultra provides premium features that may justify the higher cost for demanding users.
Pros and Cons Summary
iRobot Roomba j9+ Pros
- $500 more affordable
- low profile, pet waste avoid, brand trust
- 1 year warranty
iRobot Roomba j9+ Cons
- Fewer premium features
Roborock S8 MaxV Ultra Pros
- Premium features and performance
- carpet lift, obstacle avoid, premium
- 2 year warranty
Roborock S8 MaxV Ultra Cons
- $500 more expensive
Final Recommendation Matrix
| Choose iRobot Roomba j9+ If... | Choose Roborock S8 MaxV Ultra If... |
|---|---|
| You want better value | You want premium performance |
| Best for: low profile, pet waste avoid | Best for: carpet lift, obstacle avoid |
| You prefer iRobot brand reputation | You prefer Roborock brand reputation |
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