Between the L40 Ultra and X40 Ultra, the L40 Ultra comes out ahead in several specs, while the X40 Ultra wins on suction and battery life. Overall, the L40 Ultra scores 68.2 and the X40 Ultra scores 70.7 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (68.2 vs 70.7). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.
The L40 Ultra doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
Pick the X40 Ultra if you care most about suction and battery life. Its strongest claims are suction, battery life, water tank.
Both ship with comparable mopping, lidar, self-empty base, so those specs don't separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Dreame - L40 Ultra wins
- No decisive advantages.
Why Dreame - X40 Ultra wins
- ▲Suction — 9.09% more. 12000 Pa vs 11000 Pa.
- ▲Battery life — 5.00% more. 210 min vs 200 min.
- ▲Water tank — 3.85% more. 270 ml vs 260 ml.
Spec comparison
Cleaning
| Spec | Dreame - L40 Ultra | Dreame - X40 Ultra |
|---|---|---|
| Suction | 11000 Pa | 12000 Palead |
| Mopping | true | true |
| Water tank | 260 ml | 270 mllead |
| Dustbin | 320 ml | 350 mllead |
| Carpet detection | true | true |
Navigation
| Spec | Dreame - L40 Ultra | Dreame - X40 Ultra |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 40 mm | 60 mmlead |
Autonomy
| Spec | Dreame - L40 Ultra | Dreame - X40 Ultra |
|---|---|---|
| Battery life | 200 min | 210 minlead |
| Self-empty base | true | true |
| Self-wash mop | true | true |
| Self-dry mop | true | true |
| Noise | 65 dB | 65 dB |
Frequently asked
Which has stronger suction, L40 Ultra or X40 Ultra?+
X40 Ultra delivers 12000 Pa vs 11000 Pa.
Do L40 Ultra or X40 Ultra mop?+
Both can mop.
Which has a self-emptying base, L40 Ultra or X40 Ultra?+
Both ship with a self-emptying base.
Spec-level deep dives
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