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 and the Roborock Qrevo S Pro are evenly matched, rated 4.4 and 4.3. The Dreame L40s Ultra CE leads on mopping.
Roborock Qrevo S Pro
For buyers who want strong suction and a hot-wash mop dock for under $700, and can live without extending mops.
Amazon $399.99$399.99
Prices were last checked November 2, 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 CE for mopping (Dual spinning pads, lifts 10.5 mm, extends to edges vs Dual spinning pads, lifts 10 mm).
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 Qrevo S Pro |
|---|---|---|
| Overall rating | 4.4/5 | 4.3/5 |
| 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 | 92 $400 |
| Dock 20% | 83 Self-empties the bin, washes the mop, hot-air mop drying | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying |
| Navigation 15% | 85 LiDAR + 3D light | 85 LiDAR + 3D light |
| Mopping 10% | 76 Dual spinning pads, lifts 10.5 mm, extends to edges | 61 Dual spinning pads, lifts 10 mm |
Specifications
| Dreame L40s Ultra CE | Roborock Qrevo S Pro | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 13,000 Pa | 18,500 Pa |
| Main brush | TriCut brush | single all-rubber 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 |
| Mop lift | 10.5 mm | 10 mm |
| Leaves mop at dock | No | No |
| Extending mop | Yes | No |
| Water tank | - | 80 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 | Yes |
| Hot-air drying | Yes | Yes |
| Detergent dosing | No | - |
| Clean water tank | 4.5 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 | - | Yes |
| Voice assistants | Alexa, Siri, Google Assistant | - |
| 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 4 h 2 min |
| Weight | 8.6 lb (3.9 kg) | - |
| Warranty | 3 years | 1 year |
| Released | 2025-08 | 2026-04 |