Dreame L40s Ultra CE
A cheaper L40s with a full self-cleaning dock, for homes that want hands-off mopping on a budget and can live without hot-water washing.
Amazon $399.48$399.48
The Dreame L40s Ultra CE is the better robot vacuum overall, rated 4.4 to 4.2. The Roborock QV 35A costs $19.49 less ($379.99 vs $399.48).
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 $379.99$379.99
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
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 CE | Roborock QV 35A |
|---|---|---|
| Overall rating | 4.4/5 | 4.2/5 |
| Cleaning 30% | 73 not yet tested; estimated from 12 tested Dreame robots and the median of the 70 tested robots | 63 not yet tested; estimated from 19 tested Roborock robots and the median of the 70 tested robots |
| Value 25% | 92 $399 | 95 $380 |
| Dock 20% | 83 Self-empties the bin, washes the mop, hot-air mop drying | 76 Self-empties the bin, washes the mop |
| Navigation 15% | 85 LiDAR + 3D light | 85 LiDAR + 3D light |
| Mopping 10% | 76 Dual spinning pads, lifts 10.5 mm, extends to edges | 76 Dual spinning pads, lifts 10 mm, extends to edges |
Specifications
| Dreame L40s Ultra CE | Roborock QV 35A | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 13,000 Pa | 8,000 Pa |
| Main brush | TriCut brush | all-rubber floating main brush |
| Dustbin | 320 mL | 330 mL |
| Extending side brush | No | No |
| Mopping | ||
| Mop | Dual spinning pads, lifts 10.5 mm, extends to edges | Dual spinning pads, lifts 10 mm, extends to edges |
| Mop lift | 10.5 mm | 10 mm |
| Leaves mop at dock | No | 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 | No | No |
| Hot-air drying | Yes | No |
| Detergent dosing | No | - |
| Clean water tank | 4.5 L | 4 L |
| Navigation & app | ||
| Navigation | LiDAR + 3D light | LiDAR + 3D light |
| Obstacle avoidance | Single-laser 3D structured light | Structured light (Reactive Tech) |
| Climbs thresholds | 20 mm | 20 mm |
| Matter | - | No |
| Voice assistants | Alexa, Siri, Google Assistant | Alexa, Google Assistant, Siri Shortcuts |
| Build | ||
| Height | 4.1 in (104 mm) | 3.8 in (97 mm) |
| Retracting LiDAR | No | No |
| Battery | 5,200 mAh | 5,200 mAh |
| Run time | Up to 4 h 20 min | Up to 3 h |
| Weight | 8.6 lb (3.9 kg) | - |
| Warranty | 3 years | - |
| Released | 2025-08 | 2025-05 |