Roborock S8 Max Ultra
For buyers who can plumb in the dock and want a hands-off mopping robot that never needs its water tanks touched.
Amazon $599.99$599.99
The Roborock S8 Max Ultra is the better robot vacuum overall, rated 4.1 to 3.7. The Roborock S8 Max Ultra leads on navigation. The Eufy Omni C20 wins on value. The Eufy Omni C20 costs $220 less ($379.99 vs $599.99).
Eufy Omni C20
The cheapest way into a dock that washes the mops, for small homes with low furniture. Its weak carpet cleaning and short range rule it out for bigger or carpeted homes.
Amazon $379.99$379.99
Prices were last checked October 26, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Roborock S8 Max Ultra for navigation (LiDAR + 3D light vs LiDAR).
- Choose the Eufy Omni C20 for value ($380 vs $600).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every self-cleaning dock robot vacuum; a clear win is highlighted. How we rank explains each one.
| Factor weight | Roborock S8 Max Ultra | Eufy Omni C20 |
|---|---|---|
| Overall rating | 4.1/5 | 3.7/5 |
| Cleaning 30% | 63 not yet tested; estimated from 19 tested Roborock robots and the median of the 70 tested robots | 36 measured 75% of sand from carpet, 96% of pet hair, some hair tangled (0.5) |
| Value 25% | 67 $600 | 95 $380 |
| Dock 20% | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent, optional water hookup | 68 Self-empties the bin, washes the mop |
| Navigation 15% | 85 LiDAR + 3D light | 65 LiDAR |
| Mopping 10% | 62 Vibrating pad, lifts 20 mm, extends to edges | 61 Dual spinning pads, lifts 10.4 mm |
Independent tests
Roborock S8 Max Ultra
No independent test published yet.
Eufy Omni C20
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 75% | 96% | 0.5 | 546 sq ft | Embedded sand in medium-pile carpet; flattened 2.5 in pet hair on carpet, two runs; 7 in hair tangle on hard floor (0 = none wrapped). |
Specifications
| Roborock S8 Max Ultra | Eufy Omni C20 | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 8,000 Pa | 7,000 Pa |
| Main brush | DuoRoller Riser dual rubber brushes | Rolling brush with Pro-Detangle Comb |
| Dustbin | - | 250 mL |
| Extending side brush | Yes | No |
| Mopping | ||
| Mop | Vibrating pad, lifts 20 mm, extends to edges | Dual spinning pads, lifts 10.4 mm |
| Mop lift | 20 mm | 10.4 mm |
| Leaves mop at dock | No | No |
| Extending mop | Yes | No |
| Dock | ||
| Dock | Washes mop + empties | Washes mop + empties |
| Self-empties | Yes | Yes |
| Dust bag | - | 3.1 L |
| Washes mop | Yes | Yes |
| Hot-water wash | Yes | No |
| Hot-air drying | Yes | No |
| Detergent dosing | Yes | - |
| Water hookup option | Yes | No |
| Clean water tank | - | 2.5 L |
| Navigation & app | ||
| Navigation | LiDAR + 3D light | LiDAR |
| Obstacle avoidance | 3D structured light (Reactive 3D) | Infrared and point laser for larger obstacles only |
| Climbs thresholds | - | 18 mm |
| Matter | - | No |
| Voice assistants | Alexa, Google Assistant, Siri Shortcuts | Alexa, Google Assistant |
| Build | ||
| Height | 3.8 in (97 mm) | 3.3 in (85 mm) |
| Retracting LiDAR | No | No |
| Battery | 5,200 mAh | 3,200 mAh |
| Run time | - | Up to 1 h 41 min |
| Weight | - | 7.3 lb (3.3 kg) |
| Warranty | - | 1 year |
| Released | 2024-04 | 2024-11 |