Roborock S8 Pro Ultra vs Xiaomi Robot Vacuum S40 Pro
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AI Matrix
Powered by Claude AIRoborock S8 Pro Ultra clearly outperforms the Xiaomi Robot Vacuum S40 Pro in the robot vacuums category, especially in display quality, scoring 54 vs 35. If you want the better overall robot vacuums, Roborock S8 Pro Ultra is the recommended choice.
5 Reasons Why Roborock S8 Pro Ultra Is Better
- 1.Lower price: $175 vs $449
- 2.Better performance score: 45 vs 11
- 3.Better display rating: 100 vs 56
- 4.Better value score: 93 vs 74
- 5.Higher overall score: 54 vs 35
What are you giving up?
Picking Roborock S8 Pro Ultra over Xiaomi Robot Vacuum S40 Pro means trading these off.
You give up
- −1800g lighter (3200g vs 5000g)
- −Larger battery: 5,200mAh vs 5,000mAh
- −Longer battery life: 2.5h vs 2h
You gain
- +$274 cheaper ($175 vs $449)
Spec Comparison
Roborock S8 Pro UltraXiaomi Robot Vacuum S40 Pro
Score Breakdown
Roborock S8 Pro UltraXiaomi Robot Vacuum S40 Pro
93
Price20% weight
74Roborock S8 Pro Ultra Winner
45
Suction30% weight
11Roborock S8 Pro Ultra Winner
0
Battery Life25% weight
1Tie
78
Navigation15% weight
78Tie
100
Features10% weight
56Roborock S8 Pro Ultra Winner
Scores are relative within the robot vacuumscategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.
Roborock S8 Pro Ultra
Winner✓ Pros
- ●Lower price: $175 vs $449
- ●Higher performance score
- ●Better display score
- ●Water resistant (IP68)
✗ Cons
- ●Smaller battery: 5,000mAh vs 5,200mAh
- ●Shorter battery life: 2h vs 2.5h
Xiaomi Robot Vacuum S40 Pro
✓ Pros
- ●Bigger battery: 5,200mAh vs 5,000mAh
- ●Longer battery life: 2.5h vs 2h
- ●Lighter build: 3200g vs 5000g
✗ Cons
- ●Higher price: $449 vs $175
- ●Higher price relative to value
- ●Lower display score
Spec Comparison
| Spec | Roborock S8 Pro UltraW | Xiaomi Robot Vacuum S40 Pro |
|---|---|---|
| Price | 175$ | 449$ |
| Battery | 5000mAh | 5200mAh✓ |
| Battery Life | 2hrs | 2.5hrs✓ |
| Bluetooth | 5.0 | 5.0 |
| Wi-Fi | true | true |
| Water Resistance | IP68 | — |
| Weight | 5000g | 3200g✓ |
| Colors | Black, White | Black, White |
Who Should Buy
Buy Roborock S8 Pro Ultra if…
Buy the Roborock S8 Pro Ultra if you want the best performance in this comparison. It scores higher overall and is the recommended choice for most buyers.
Buy Xiaomi Robot Vacuum S40 Pro if…
The Xiaomi Robot Vacuum S40 Pro is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Roborock S8 Pro Ultra vs Xiaomi Robot Vacuum S40 Pro — FAQ
Roborock S8 Pro Ultra vs Xiaomi Robot Vacuum S40 Pro: which is better?
Roborock S8 Pro Ultra clearly outperforms the Xiaomi Robot Vacuum S40 Pro in the robot vacuums category, especially in display quality, scoring 54 vs 35. If you want the better overall robot vacuums, Roborock S8 Pro Ultra is the recommended choice.
Is Roborock S8 Pro Ultra better than Xiaomi Robot Vacuum S40 Pro?
Yes, Roborock S8 Pro Ultra scores higher overall (84 vs 48).
Which is cheaper, Roborock S8 Pro Ultra or Xiaomi Robot Vacuum S40 Pro?
Roborock S8 Pro Ultra is cheaper at $175 vs $449 for the Xiaomi Robot Vacuum S40 Pro.
Who should buy the Roborock S8 Pro Ultra?
Buy the Roborock S8 Pro Ultra if you want the best performance in this comparison. It scores higher overall and is the recommended choice for most buyers.
Who should buy the Xiaomi Robot Vacuum S40 Pro?
The Xiaomi Robot Vacuum S40 Pro is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Which has better battery life, Roborock S8 Pro Ultra or Xiaomi Robot Vacuum S40 Pro?
Xiaomi Robot Vacuum S40 Pro has a larger battery (5,200mAh vs 5,000mAh for the Roborock S8 Pro Ultra), which generally means longer use between charges.
Which lasts longer, Roborock S8 Pro Ultra or Xiaomi Robot Vacuum S40 Pro?
Xiaomi Robot Vacuum S40 Pro lasts longer with 2.5 hours vs 2 hours for the other.
Which is lighter, Roborock S8 Pro Ultra or Xiaomi Robot Vacuum S40 Pro?
Xiaomi Robot Vacuum S40 Pro is lighter at 3200g vs 5000g.
Related Comparisons
Full Roborock S8 Pro Ultra review →Full Xiaomi Robot Vacuum S40 Pro review →All Roborock Robot Vacuums →All Xiaomi Robot Vacuums →
Reviewed by VersusMatrix Editorial Team
Last updated: April 28, 2026
Methodology: AI-powered analysis of technical specifications from manufacturer data. Scores are calculated by comparing products across multiple dimensions and normalized relative to the full category database. Our editorial process is independent and not influenced by affiliate partnerships.