Dreame L40 Ultra: specs and price
This review measures the Dreame L40 Ultra against the full 30-spec sheet we track for Robot Vacuums, comparing it like for like with the 4 other models in our database. It earns a VS Score of 47 out of 100 — the weighted result of every verified specification measured against the class average.
On the spec sheet it is strongest in smart features and weakest in cleaning. Street prices currently start at $ 4.51 for the Dreame L40 Ultra. A transparency note: this spec sheet is 87% complete. Anything unverified shows as Unknown and is left out of the score — we never estimate a missing value.
Category strengths
Where the Dreame L40 Ultra trails the average
- 6,125 Pa less suction power ?11,000 Pa vs 17,125 Pa (avg)
- 14.8 mm less threshold clearance ?22 mm vs 36.8 mm (avg)
- 7.92 mm more height ?103.8 mm vs 95.88 mm (avg)
- 31.67 ml less dustbin capacity ?300 ml vs 331.67 ml (avg)
- 400 mAh less battery capacity ?5,200 mAh vs 5,600 mAh (avg)
Specifications
Quality bars are generated automatically against 4 other robot vacuums.
Cleaning
Higher suction lifts more dirt from carpets and hard floors.
Also mops hard floors.
Lifts the mop over carpet to avoid soaking it.
The available cleaning modes.
How much floor it can cover on one charge.
The main brush design (e.g. anti-tangle rubber).
Navigation
How it maps and navigates; LiDAR is the most precise.
Builds and saves a map of your home.
How many floor maps it stores.
Detects and avoids objects and cables.
Set virtual walls and keep-out areas in the app.
The tallest doorway lip or threshold the robot can climb.
Battery & dock
A larger battery runs longer between charges.
How long it cleans on a full charge.
Returns to charge, then finishes where it left off.
Empties its bin into the dock automatically.
The dock refills clean water and drains dirty water.
The dock washes and dries the mop pads.
Design
A lower profile fits under more furniture; lower is better.
A larger onboard bin needs emptying less often.
The onboard clean-water capacity for mopping.
Quieter operation is less disruptive; lower is better.
Smart features
Control and schedule it from a phone app.
Works with Alexa and Google Assistant.
Set cleaning schedules.
Send it to clean specific rooms or zones.
Maintenance & filtration
A high-efficiency filter captures fine dust and allergens.
The onboard filter can be rinsed and reused.
The brush design reduces wrapped hair and manual cleaning.
Mop pads can be removed for cleaning or replacement.
How the VS Score works — and what it can’t tell you
Every measurable spec is scored against the average of all the Robot Vacuums we track: matching the class average scores 50, clearly beating it climbs towards 100, and each spec counts according to an editorial weight that reflects real-world impact — a battery-capacity gap moves the score far more than a colour-options list. The quality bars on the spec cards above show where this model sits inside the full range for its class, and the overall VS Score rolls every weighted result into one number.
Unknown values are never estimated. A spec this product doesn’t report simply drops out of its scoring — it isn’t penalised with a guess — but a thinner spec sheet does mean a score built on fewer data points, which is why completeness is disclosed under About this data.
Most importantly: a spec-sheet lead is not the same as a better product. Megapixels, gigahertz and benchmark points describe capacity, not experience — image processing, software optimisation, thermals, haptics and ergonomics decide how a device actually feels, and no table captures reliability or long-term support quality. Treat the VS Score as a structured summary of what can be measured, not a substitute for your own priorities.
About this data
- Specifications are compiled from each manufacturer’s official spec sheet, cross-checked against trusted specification databases, and normalised into one schema so identical things are compared identically.
- Specifications last verified July 21, 2026.
- Data completeness: 26 of the 30 specs in this category are verified (87%). Anything we could not verify is shown as Unknown — never estimated — and is excluded from the score.
- Prices and availability come from live retailer feeds via our shopping partners and refresh throughout the day; a missing price means no partner currently lists the product, not that it is discontinued.
- Want the full picture? Our editorial guidelines explain how we research products, weight the scores and stay independent.
- Spotted an error in a spec? Tell us and we will correct the sheet.
Where to buy
Prices and availability may change. Check the retailer before buying. We may earn a commission on purchases.
Price history
Robot Vacuums with similar specs to the Dreame L40 Ultra
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The bottom line
The Dreame L40 Ultra earns a VS Score of 47, a solid mid-pack result among the 5 robot vacuums we compare here. Just be aware of 6,125 Pa less suction power and 14.8 mm less threshold clearance before you buy. Weigh those trade-offs against what matters most to you.
The VS Score is generated automatically from the weighted specifications above, measured against all other robot vacuums in our database. Treat it as a shortlisting guide — not a substitute for your own priorities.