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 $469.99$469.99
The Dreame L40s Ultra is the better robot vacuum overall, rated 4.6 to 4.0. The Dreame L40s Ultra leads on cleaning and mopping. The Roborock QV 35A costs $20 less ($449.99 vs $469.99).
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 QV 35A
For budget buyers who want a self-emptying, mop-washing dock and obstacle avoidance at the lowest price in Roborock’s Qrevo range.
Amazon $449.99$449.99
Which should you buy?
- Choose the Dreame L40s Ultra for cleaning (measured 92% of sand from carpet, 91% of pet hair, no hair tangled vs measured 90% of sand from carpet, 58.7% of pet hair, some hair tangled (0.7)) 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 QV 35A |
|---|---|---|
| Overall rating | 4.6/5 | 4.0/5 |
| Cleaning 30% | 88 measured 92% of sand from carpet, 91% of pet hair, no hair tangled | 52 measured 90% of sand from carpet, 58.7% of pet hair, some hair tangled (0.7) |
| Value 25% | 82 $470 | 85 $450 |
| Dock 20% | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent | 76 Self-empties the bin, washes the mop |
| 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 QV 35A
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 90% | 58.7% | 0.7 | 1,536 sq ft | Embedded sand in medium-pile carpet; flattened 2.5 in pet hair on carpet; 7 in hair tangle on hard floor (0 = none wrapped). |
Specifications
| Dreame L40s Ultra | Roborock QV 35A | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 19,000 Pa | 8,000 Pa |
| Main brush | HyperStream Detangling DuoBrush (bristled rubber brush plus TPU rubber brush) | all-rubber floating main brush |
| Dustbin | 310 mL | 330 mL |
| Extending side brush | Yes | No |
| 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 | 2.7 L |
| Washes mop | Yes | Yes |
| Hot-water wash | Yes | No |
| Hot-air drying | Yes | No |
| Detergent dosing | Yes | - |
| Clean water tank | 4.5 L | 4 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 | - | No |
| 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 40 min | Up to 3 h |
| Weight | 9 lb (4.1 kg) | - |
| Warranty | 3 years | - |
| Released | 2025-08 | 2025-05 |