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 $669.99$669.99
The Dreame L40s Ultra AE is the better robot vacuum overall, rated 4.2 to 4.1. The Dreame L40s Ultra AE leads on navigation. The Roborock Qrevo Curv 2 Flow costs $20 less ($649.99 vs $669.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Roborock Qrevo Curv 2 Flow
For hard-floor homes that want a roller mop without paying Saros prices.
Amazon $649.99$649.99
Which should you buy?
- Choose the Dreame L40s Ultra AE for navigation (LiDAR + camera vs LiDAR + 3D light).
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 Qrevo Curv 2 Flow |
|---|---|---|
| Overall rating | 4.2/5 | 4.1/5 |
| Cleaning 30% | 66 measured 85% of sand from carpet, 80.8% of pet hair, no hair tangled | 70 measured 87% of sand from carpet, 77.5% of pet hair, no hair tangled |
| Value 25% | 60 $670 | 62 $650 |
| Dock 20% | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent | 85 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying |
| Navigation 15% | 100 LiDAR + camera | 85 LiDAR + 3D light |
| Mopping 10% | 76 Dual spinning pads, lifts 10.5 mm, extends to edges | 80 Roller, lifts 15 mm |
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 Qrevo Curv 2 Flow
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 87% | 77.5% | 0 | 1,287 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
| Dreame L40s Ultra AE | Roborock Qrevo Curv 2 Flow | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 19,000 Pa | 20,000 Pa |
| Main brush | Liftable rubber brush with TriCut hair-cutting | dual short anti-tangle rollers |
| Dustbin | 395 mL | 324 mL |
| Extending side brush | No | No |
| Mopping | ||
| Mop | Dual spinning pads, lifts 10.5 mm, extends to edges | Roller, lifts 15 mm |
| Mop lift | 10.5 mm | 15 mm |
| Leaves mop at dock | No | No |
| Extending mop | Yes | No |
| Water tank | - | 102 mL |
| 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 | No |
| Water hookup option | - | No |
| Clean water tank | 4.5 L | - |
| Navigation & app | ||
| Navigation | LiDAR + camera | LiDAR + 3D light |
| Obstacle avoidance | AI camera, recognises 120+ object types | Structured light |
| Climbs thresholds | 20 mm | 20 mm |
| Matter | - | Yes |
| Voice assistants | Alexa, Google Assistant | - |
| Build | ||
| Height | 3.8 in (97 mm) | 4.7 in (119 mm) |
| Retracting LiDAR | - | No |
| Battery | 5,200 mAh | 5,200 mAh |
| Run time | Up to 3 h | Up to 4 h 2 min |
| Weight | 8.8 lb (4 kg) | - |
| Warranty | 3 years | 1 year |
| Released | 2025-08 | 2025-12 |