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 4.4. The Dreame L40s Ultra leads on mopping. The Dreame L40s Ultra CE wins on value. The Dreame L40s Ultra CE costs $99.98 less ($399.99 vs $499.97).
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 $399.99$399.99
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 mopping (Dual spinning pads, leaves its mop at the dock for carpet, extends to edges vs Dual spinning pads, lifts 10.5 mm, extends to edges).
- Choose the Dreame L40s Ultra CE for value ($400 vs $500).
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 | Dreame L40s Ultra CE |
|---|---|---|
| Overall rating | 4.6/5 | 4.4/5 |
| Cleaning 30% | 88 measured 92% of sand from carpet, 91% of pet hair, no hair tangled | 73 not yet tested; estimated from 12 tested Dreame robots and the median of the 70 tested robots |
| Value 25% | 78 $500 | 92 $400 |
| Dock 20% | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent | 83 Self-empties the bin, washes the mop, hot-air mop drying |
| 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 10.5 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). |
Dreame L40s Ultra CE
No independent test published yet.
Specifications
| Dreame L40s Ultra | Dreame L40s Ultra CE | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 19,000 Pa | 13,000 Pa |
| Main brush | HyperStream Detangling DuoBrush (bristled rubber brush plus TPU rubber brush) | TriCut brush |
| Dustbin | 310 mL | 320 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 10.5 mm, extends to edges |
| Mop lift | 10.5 mm | 10.5 mm |
| Leaves mop at dock | Yes | No |
| Extending mop | Yes | Yes |
| Dock | ||
| Dock | Washes mop + empties | Washes mop + empties |
| Self-empties | Yes | Yes |
| Dust bag | 3.2 L | 3.2 L |
| Washes mop | Yes | Yes |
| Hot-water wash | Yes | No |
| Hot-air drying | Yes | Yes |
| Detergent dosing | Yes | No |
| Clean water tank | 4.5 L | 4.5 L |
| Navigation & app | ||
| Navigation | LiDAR + 3D light | LiDAR + 3D light |
| Obstacle avoidance | 3DAdapt structured-light obstacle avoidance | Single-laser 3D structured light |
| Climbs thresholds | 40 mm | 20 mm |
| Voice assistants | Alexa, Google Assistant | Alexa, Siri, Google Assistant |
| Build | ||
| Height | 3.8 in (97 mm) | 4.1 in (104 mm) |
| Retracting LiDAR | - | No |
| Battery | 5,200 mAh | 5,200 mAh |
| Run time | Up to 3 h 40 min | Up to 4 h 20 min |
| Weight | 9 lb (4.1 kg) | 8.6 lb (3.9 kg) |
| Warranty | 3 years | 3 years |
| Released | 2025-08 | 2025-08 |