Dreame L40s Ultra AE
For buyers who want an AI camera for obstacle avoidance and remote viewing on a full self-cleaning dock; for carpet and pet hair, the plain L40s Ultra measured better.
Amazon $599.98$599.98
The Dreame L40s Ultra AE is the better robot vacuum overall, rated 4.3 to 4.1. The Dreame L40s Ultra AE leads on navigation and mopping.
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
Prices were last checked November 2, 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 Dreame L40s Ultra AE for navigation (LiDAR + camera vs LiDAR + 3D light) and mopping (Dual spinning pads, lifts 10.5 mm, extends to edges vs Vibrating pad, lifts 20 mm, extends to edges).
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 | Dreame L40s Ultra AE | Roborock S8 Max Ultra |
|---|---|---|
| Overall rating | 4.3/5 | 4.1/5 |
| Cleaning 30% | 66 measured 85% of sand from carpet, 80.8% of pet hair, no hair tangled | 63 not yet tested; estimated from 19 tested Roborock robots and the median of the 70 tested robots |
| Value 25% | 67 $600 | 67 $600 |
| Dock 20% | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent, optional water hookup |
| Navigation 15% | 100 LiDAR + camera | 85 LiDAR + 3D light |
| Mopping 10% | 76 Dual spinning pads, lifts 10.5 mm, extends to edges | 62 Vibrating pad, lifts 20 mm, extends to edges |
Independent tests
Dreame L40s Ultra AE
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 85% | 80.8% | 0 | 1,591 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). |
Roborock S8 Max Ultra
No independent test published yet.
Specifications
| Dreame L40s Ultra AE | Roborock S8 Max Ultra | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 19,000 Pa | 8,000 Pa |
| Main brush | Liftable rubber brush with TriCut hair-cutting | DuoRoller Riser dual rubber brushes |
| Dustbin | 395 mL | - |
| Extending side brush | No | Yes |
| Mopping | ||
| Mop | Dual spinning pads, lifts 10.5 mm, extends to edges | Vibrating pad, lifts 20 mm, extends to edges |
| Mop lift | 10.5 mm | 20 mm |
| Leaves mop at dock | No | No |
| Extending mop | Yes | Yes |
| Dock | ||
| Dock | Washes mop + empties | Washes mop + empties |
| Self-empties | Yes | Yes |
| Dust bag | 3.2 L | - |
| Washes mop | Yes | Yes |
| Hot-water wash | Yes | Yes |
| Hot-air drying | Yes | Yes |
| Detergent dosing | Yes | Yes |
| Water hookup option | - | Yes |
| Clean water tank | 4.5 L | - |
| Navigation & app | ||
| Navigation | LiDAR + camera | LiDAR + 3D light |
| Obstacle avoidance | AI camera, recognises 120+ object types | 3D structured light (Reactive 3D) |
| Climbs thresholds | 20 mm | - |
| Voice assistants | Alexa, Google Assistant | Alexa, Google Assistant, Siri Shortcuts |
| Build | ||
| Height | 3.8 in (97 mm) | 3.8 in (97 mm) |
| Retracting LiDAR | - | No |
| Battery | 5,200 mAh | 5,200 mAh |
| Run time | Up to 3 h | - |
| Weight | 8.8 lb (4 kg) | - |
| Warranty | 3 years | - |
| Released | 2025-08 | 2024-04 |