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

The Dreame L40s Ultra is the better robot vacuum overall, rated 4.6 to 4.3. The Dreame L40s Ultra leads on mopping.

Higher rated

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

Dreame L40 Ultra Gen 2

#20 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 $499.98

$499.98

Prices were last checked October 30, 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).

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 L40 Ultra Gen 2
Overall rating	4.6/5	4.3/5
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	78 $500
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%	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).