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 Dreame L40s Ultra costs $100.02 less ($499.97 vs $599.99).
Roborock Qrevo Curv S5X
For buyers who want the Qrevo Curv’s cleaning features and round dock at a lower price, without its threshold-climbing chassis.
Amazon $599.99$599.99
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 Dreame L40s Ultra for value ($500 vs $600) 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).
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 Curv S5X |
|---|---|---|
| Overall rating | 4.6/5 | 4.2/5 |
| Cleaning 30% | 88 measured 92% of sand from carpet, 91% 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% | 78 $500 | 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, optional water hookup |
| Navigation 15% | 85 LiDAR + 3D light | 85 LiDAR + 3D light |
| 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 Curv S5X
No independent test published yet.
Specifications
| Dreame L40s Ultra | Roborock Qrevo Curv S5X | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 19,000 Pa | 18,500 Pa |
| Main brush | HyperStream Detangling DuoBrush (bristled rubber brush plus TPU rubber brush) | DuoDivide floating anti-tangle brush |
| Dustbin | 310 mL | 325 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 | - | 72 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 | - |
| Water hookup option | - | Yes |
| Clean water tank | 4.5 L | - |
| Navigation & app | ||
| Navigation | LiDAR + 3D light | LiDAR + 3D light |
| Obstacle avoidance | 3DAdapt structured-light obstacle avoidance | Structured light (Reactive Tech) |
| Climbs thresholds | 40 mm | 20 mm |
| Matter | - | Yes |
| Voice assistants | Alexa, Google Assistant | - |
| Build | ||
| Height | 3.8 in (97 mm) | 3.9 in (98 mm) |
| Retracting LiDAR | - | No |
| Battery | 5,200 mAh | 5,200 mAh |
| Run time | Up to 3 h 40 min | Up to 3 h 10 min |
| Weight | 9 lb (4.1 kg) | - |
| Warranty | 3 years | - |
| Released | 2025-08 | 2025-03 |