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 4.3. The Dreame L40s Ultra leads on cleaning, value and mopping. The Dreame L40s Ultra AE wins on navigation. The Dreame L40s Ultra costs $100.01 less ($499.97 vs $599.98).
Dreame L40s Ultra AE
For buyers who want an AI camera for obstacle avoidance and remote viewing on a full self-cleaning dock; for carpet and pet hair, the plain L40s Ultra measured better.
Amazon $599.98$599.98
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 cleaning (measured 92% of sand from carpet, 91% of pet hair, no hair tangled vs measured 85% of sand from carpet, 80.8% of pet hair, no hair tangled), 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 10.5 mm, extends to edges).
- Choose the Dreame L40s Ultra AE for navigation (LiDAR + camera vs LiDAR + 3D light).
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 AE |
|---|---|---|
| Overall rating | 4.6/5 | 4.3/5 |
| Cleaning 30% | 88 measured 92% of sand from carpet, 91% of pet hair, no hair tangled | 66 measured 85% of sand from carpet, 80.8% of pet hair, no hair tangled |
| 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, doses detergent |
| Navigation 15% | 85 LiDAR + 3D light | 100 LiDAR + camera |
| 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 AE
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 85% | 80.8% | 0 | 1,591 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). |
Specifications
| Dreame L40s Ultra | Dreame L40s Ultra AE | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 19,000 Pa | 19,000 Pa |
| Main brush | HyperStream Detangling DuoBrush (bristled rubber brush plus TPU rubber brush) | Liftable rubber brush with TriCut hair-cutting |
| Dustbin | 310 mL | 395 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 | Yes |
| Hot-air drying | Yes | Yes |
| Detergent dosing | Yes | Yes |
| Clean water tank | 4.5 L | 4.5 L |
| Navigation & app | ||
| Navigation | LiDAR + 3D light | LiDAR + camera |
| Obstacle avoidance | 3DAdapt structured-light obstacle avoidance | AI camera, recognises 120+ object types |
| Climbs thresholds | 40 mm | 20 mm |
| Voice assistants | Alexa, Google Assistant | Alexa, Google Assistant |
| Build | ||
| Height | 3.8 in (97 mm) | 3.8 in (97 mm) |
| 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) | 8.8 lb (4 kg) |
| Warranty | 3 years | 3 years |
| Released | 2025-08 | 2025-08 |