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
The Dreame L40s Ultra AE is the better robot vacuum overall, rated 4.3 to 3.9. The Dreame L40s Ultra AE leads on cleaning. The Dreame X40 Ultra wins on mopping. The Dreame X40 Ultra costs $9.99 less ($589.99 vs $599.98).
Dreame X40 Ultra
Dreame’s 2024 flagship, now hard to find new; worth it only at a deep discount, as the X50 and L-series robots clean better.
Amazon $589.99$589.99
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 AE for cleaning (measured 85% of sand from carpet, 80.8% of pet hair, no hair tangled vs measured 80% of sand from carpet, 75.5% of pet hair, some hair tangled (0.8)).
- Choose the Dreame X40 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).
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 AE | Dreame X40 Ultra |
|---|---|---|
| Overall rating | 4.3/5 | 3.9/5 |
| Cleaning 30% | 66 measured 85% of sand from carpet, 80.8% of pet hair, no hair tangled | 37 measured 80% of sand from carpet, 75.5% of pet hair, some hair tangled (0.8) |
| Value 25% | 67 $600 | 68 $590 |
| Dock 20% | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent | 90 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent |
| Navigation 15% | 100 LiDAR + camera | 100 LiDAR + camera |
| Mopping 10% | 76 Dual spinning pads, lifts 10.5 mm, extends to edges | 86 Dual spinning pads, leaves its mop at the dock for carpet, extends to edges |
Independent tests
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). |
Dreame X40 Ultra
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 80% | 75.5% | 0.8 | 1,287 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 AE | Dreame X40 Ultra | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 19,000 Pa | 12,000 Pa |
| Main brush | Liftable rubber brush with TriCut hair-cutting | Liftable rubber brush (TriCut Brush 2.0 sold separately) |
| Dustbin | 395 mL | 300 mL |
| Extending side brush | No | Yes |
| Mopping | ||
| Mop | Dual spinning pads, lifts 10.5 mm, extends to edges | Dual spinning pads, leaves its mop at the dock for carpet, extends to edges |
| Mop lift | 10.5 mm | 10.5 mm |
| Leaves mop at dock | No | Yes |
| Extending mop | Yes | Yes |
| Water tank | - | 80 mL |
| 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 |
| Water hookup option | - | No |
| Clean water tank | 4.5 L | 4.5 L |
| Navigation & app | ||
| Navigation | LiDAR + camera | LiDAR + camera |
| Obstacle avoidance | AI camera, recognises 120+ object types | RGB camera plus 3D structured light, recognises 120 object types |
| Climbs thresholds | 20 mm | 22 mm |
| Voice assistants | Alexa, Google Assistant | Alexa, Siri, Google Home |
| Build | ||
| Height | 3.8 in (97 mm) | - |
| Battery | 5,200 mAh | 6,400 mAh |
| Run time | Up to 3 h | - |
| Weight | 8.8 lb (4 kg) | - |
| Warranty | 3 years | 3 years |
| Released | 2025-08 | 2024-04 |