Dreame L40s Ultra
The value pick of Dreame’s range: strong measured carpet cleaning, long runtime and a full self-cleaning dock for about half the flagship price.
Amazon $499.97$499.97
The Dreame L40s Ultra is the better robot vacuum overall, rated 4.6 to 4.2. The Dreame L40s Ultra leads on value and mopping. The Roborock Qrevo CurvX wins on navigation. The Dreame L40s Ultra costs $250.02 less ($499.97 vs $749.99).
Roborock Qrevo CurvX
For most homes wanting a fully hands-off robot at a mid-range price, with strong carpet cleaning and long range.
Amazon $749.99$749.99
Prices were last checked October 27, 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 for value ($500 vs $750) and mopping (Dual spinning pads, leaves its mop at the dock for carpet, extends to edges vs Dual spinning pads, lifts 10 mm, extends to edges).
- Choose the Roborock Qrevo CurvX 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 | Roborock Qrevo CurvX |
|---|---|---|
| Overall rating | 4.6/5 | 4.2/5 |
| Cleaning 30% | 88 measured 92% of sand from carpet, 91% of pet hair, no hair tangled | 82 measured 92% of sand from carpet, 77.5% of pet hair, no hair tangled |
| Value 25% | 78 $500 | 53 $750 |
| 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% | 85 LiDAR + 3D light | 100 LiDAR + camera |
| Mopping 10% | 86 Dual spinning pads, leaves its mop at the dock for carpet, extends to edges | 76 Dual spinning pads, lifts 10 mm, extends to edges |
Independent tests
Dreame L40s Ultra
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 92% | 91% | 0 | 1,538 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 CurvX
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 92% | 77.5% | 0 | 1,700 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 | Roborock Qrevo CurvX | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 19,000 Pa | 22,000 Pa |
| Main brush | HyperStream Detangling DuoBrush (bristled rubber brush plus TPU rubber brush) | dual anti-tangle system |
| Dustbin | 310 mL | 259 mL |
| Extending side brush | Yes | Yes |
| Mopping | ||
| Mop | Dual spinning pads, leaves its mop at the dock for carpet, extends to edges | Dual spinning pads, lifts 10 mm, extends to edges |
| Mop lift | 10.5 mm | 10 mm |
| Leaves mop at dock | Yes | No |
| Extending mop | Yes | Yes |
| Water tank | - | 68 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 + 3D light | LiDAR + camera |
| Obstacle avoidance | 3DAdapt structured-light obstacle avoidance | Structured light and RGB camera, recognises 108 object types |
| Climbs thresholds | 40 mm | 40 mm |
| Matter | - | Yes |
| Voice assistants | Alexa, Google Assistant | Alexa, Google Assistant, Siri Shortcuts |
| Build | ||
| Height | 3.8 in (97 mm) | 3.1 in (79.8 mm) |
| Retracting LiDAR | - | Yes |
| Battery | 5,200 mAh | 6,400 mAh |
| Run time | Up to 3 h 40 min | Up to 3 h 40 min |
| Weight | 9 lb (4.1 kg) | 9.7 lb (4.4 kg) |
| Warranty | 3 years | 1 year |
| Released | 2025-08 | 2025-06 |