Dreame L40 Ultra Gen 2 vs Dreame L40s Ultra AE: Which to Buy

The Dreame L40s Ultra AE and the Dreame L40 Ultra Gen 2 are evenly matched, rated 4.3 and 4.3. The Dreame L40s Ultra AE leads on navigation. The Dreame L40 Ultra Gen 2 costs $30 less ($569.98 vs $599.98).

Higher rated

Dreame L40s Ultra AE

#28 in Self-cleaning dock4.3Full review

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

Dreame L40 Ultra Gen 2

#33 in Self-cleaning dock4.3Full review

A low-cost full self-cleaning dock with edge-reaching brush and mops, for homes with mostly hard floors and few clutter hazards.

Amazon $569.98

$569.98

Prices were last checked October 27, 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 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 AE	Dreame L40 Ultra Gen 2
Overall rating	4.3/5	4.3/5
Cleaning 30%	66 measured 85% of sand from carpet, 80.8% 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%	67 $600	70 $570
Dock 20%	100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent	94 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying
Navigation 15%	100 LiDAR + camera	85 LiDAR + 3D light
Mopping 10%	76 Dual spinning pads, lifts 10.5 mm, extends to edges	76 Dual spinning pads, lifts 10.5 mm, 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).