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Dreame L40s Ultra

Dreame L40s Ultra (white)
Color: white
$469$1,399 Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet.How we work this out

Good deal

This price is lower than the model could usually be bought for anywhere, and lower than on most days of the past month.

17% below the usual lowest price at any store, and cheaper than on at least three in four of the last 30 days.

Amazon.com
Price on Amazon Check price on Amazon ↗
Dreame 3–7 days no returns
$1,399$469 Go to Dreame ↗
Compare all 2 stores

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Is the Dreame L40s Ultra right for your home? Find out in 7 questions →

About this model

On obstacles the two testers of the Dreame L40s Ultra flatly disagree. Just A Dad Approved marked it 8 out of 10 after three months among ordinary household clutter, where it never got stuck. Vacuum Wars laid out 24 objects, watched the robot steer round 7 of them, and scored it 1.07 out of 5, under half the 2.375 that marks the middle of its field. The safe reading for a home is that furniture and shoes are no trouble while a charging cable or a dropped sock is, so small things are best picked up first.

Learn more →

Who it suits

Good for

  • Rugs and carpet: lifts the mop 0.4 in (10.5 mm)
  • Pets: anti-tangle brush
  • Mopping: station washes and dries the mop
  • Upkeep: all-in-one station
  • Water hookup: dock connects to the water supply
  • Clutter on the floor: 3D sensor detects obstacles

Not for

  • Low furniture: 3.8 in (9.7 cm) tall

From the facts the maker states, by the rules of our advisor.

On this page

  1. Overview$469 today, rank 33 of 94
  2. Stores2 stores, from $469
  3. Price historyWaiting may pay off, 2 price drops
  4. What to expect2 tests, 1 min read
  5. Specifications44 facts
  6. Our scorescore 7.4 out of 10
  7. Questions6 questions
$469Dreame (brand store), white · including shipping Go to Dreame (brand store) ↗
Dreame L40s Ultra (white)

Before you buy, compare it with 2 recommended alternatives ?

Green is the best of these 3, also when they share the lead.

This model Dreame L40s Ultra Best on 7 facts Lower score, 4% cheaper Ecovacs Deebot T50 Max Pro Omni Best on 3 facts Higher score, 6% pricier MOVA P10 Pro Ultra Best on 4 facts
Most important facts
Lowest price $469Dreame (brand store) $449Ecovacs (brand store) best $499MOVA (brand store)
Score 7.4 7.3 7.5 best
Customer rating – ★ 4.4 · 317 reviews –
Tests Just A Dad Approved Vacuum Wars Vacuum Wars TechRadar Just A Dad Approved Vacuum Wars
Suction power higher is better 19,000 Pa best 18,500 Pa 13,000 Pa
Runtime per charge longer is better 220 min best 206 min 150 min
Climbs thresholds up to higher is better same on all 0.9 in (22 mm) 0.9 in (22 mm) 0.9 in (22 mm)
Robot height lower is better 3.8 in (9.7 cm) best 3.9 in (9.8 cm) 3.8 in (9.7 cm) best
Mop lift on carpet higher is better 0.4 in (10.5 mm) 0.7 in (18 mm) best 0.4 in (10.5 mm)
Dust bag lasts longer is better up to 100 days best up to 90 days up to 75 days

Compare all 26 facts →

Prices per store

On November 14, 2026 the lowest price for the Dreame L40s Ultra is $469 at Dreame (brand store), shipping to the United States included. In our ranking it is rank 33 of 94 with an all-in-one station, with a score of 7.4 out of 10.

Shipping included, sales tax added at checkout. We may earn a commission when you buy through our links. How we read and order prices

Also at Amazon, price not shown yet: Amazon.com (black).

Black · 1 storeWhite · 1 store
Cheapest today
Dreame brand store
$469$1,399 −66%
Shipping3–7 days
Returnsno returns
Color: white No reviews at this store yet
To Dreame

cannot be checked: Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet. How we work this out

Price historylast 30 dayslast 90 days

Color
Lowest price per day Average $533
Lowest price per day Average $529

Follow price changes via RSS.

Lowest since Oct 7$399
Highest since Oct 7$569
Price drops since Oct 72last: November 9, 2026

What you can expect from the Dreame L40s Ultra

Lowest price today · all stores$469
Lowest since Oct 7$399
Our score7.4 Rank 33 of 94
Robot height3.8 in

What testers say about the Dreame L40s Ultra

On obstacles the two testers of the Dreame L40s Ultra flatly disagree. Just A Dad Approved marked it 8 out of 10 after three months among ordinary household clutter, where it never got stuck. Vacuum Wars laid out 24 objects, watched the robot steer round 7 of them, and scored it 1.07 out of 5, under half the 2.375 that marks the middle of its field. The safe reading for a home is that furniture and shoes are no trouble while a charging cable or a dropped sock is, so small things are best picked up first.

Carpet is where the labs agree. Vacuum Wars measured 92 per cent of the sand pressed into its test carpet coming back out, and long hair stayed off the brush for both testers. Just A Dad Approved rated hair 8.8 out of 10 against its customary 6.5. Both saw the side brush swing out into corners and take dirt that a fixed brush leaves behind.

Mopping drew a 7.4 from Just A Dad Approved, a shade under its 7.5 median. The robot can leave its pads at the station before a carpet-only run, which about one in five of its peers can do. Its extra wheels for door sills are rated for 0.9 inches, and Vacuum Wars noted that plenty of robots cross that height without them. The station stands 23.2 inches tall, 3.5 inches above the usual, so it wants measuring against a shelf or worktop.

Pros

Cons

  • Among the weakest scores on record at avoiding obstacles Vacuum Wars ↗
  • Cheaper AE version avoids obstacles far better and scored higher overall Vacuum Wars ↗
  • Advertised threshold climbing is nothing special, many robots cross the same Vacuum Wars ↗

Each point sums up, in our words, the review of the test it names, and its link leads to that review. We do not summarize RTINGS or Wirecutter: their lists are linked above.

Dreame L40s Ultra specifications ?

Product on the market since August 2025

Manual (PDF)
Climbs thresholds up to0.9 in
Mop lift on carpet0.4 in
Runtime per charge220 min
Suction power19,000 Pa

Consumables: a 3.2 l dust bag in the station, which lasts up to 100 days.

Dimensionsrobot and dock

Dock, from the front 23.2 in high 18 in deep 23.2 in 13.4 in wide Robot, from the side 13.8 in across 3.8 in

From the published dimensions. The robot passes under furniture with 3.9 in of clearance or more. The dock needs a spot 13.4 in wide and 18 in deep.

Suction and brushes 7 facts
Suction power
19,000 Pa
Anti-tangle brush
yes
Main brush
rubber and bristle
Extending side brush
yes
Carpet detection
detects carpet
Suitable for pet hair
yes
Dirt detection
yes
Mopping 5 facts
Mop type
spinning pads
Mop lift on carpet
0.4 in (10.5 mm)
Mop extends to the edges
yes
Automatic mop detach
yes
Mop refreshed while mopping
yes
Dock 13 facts
Empties the dust bin
yes
Bagless
no
Dust bag capacity
3.2 l
Dust bag lasts
up to 100 days
Washes the mop
yes
Wash temperature
167 °F (75 °C)
Dries the mop
yes
Hot-air drying
yes
Dispenses detergent
yes
Plumbing hookup
yes
Clean water tank
4.5 l
Dirty water tank
4 l
Dock size (w × d × h)
13.4 × 18 × 23.2 in (34 × 45.7 × 59 cm)
Navigation and obstacles 8 facts
Navigation
LiDAR turret
Obstacle avoidance
3D sensor (structured light)
Climbs thresholds up to
0.9 in (22 mm)
Double threshold (two steps together)
1.6 in (40 mm)
Climbing system for high thresholds
yes
Room-by-room cleaning
yes
Recharge and resume
yes
Stair-edge sensors
yes
Robot 4 facts
Robot height
3.8 in (9.7 cm)
Robot diameter
13.8 in (35 cm)
Robot weight
9 lb (4.1 kg)
Dust bin in the robot
310 ml
Battery 3 facts
Battery capacity
5,200 mAh
Runtime per charge
220 min
Charging time
3.5 h
Smart features and warranty 4 facts
Matter
no (assumed)
Voice assistants
Alexa, Google Assistant
Warranty
3 years
Scheduled runs
yes

Where a row says “no (assumed)”, the maker's full product page for this model names the feature nowhere, so we take it as a no.

Sources: dreametech.com · Manual · amazon.com

Our score

Confidence: high. Two or more test sites, or one test site and 300 or more owners’ ratings. The highest score today is 7.9.

  • Test sites 60%7.1

    5 cleaning abilities measured, on one scale for every robot.

    • Deep clean on carpet8.2
    • Pet hair8.4
    • Mopping6.9
    • Obstacle avoidance5.6
    • Navigation7.2

    Deep clean on carpet: Just A Dad Approved 8.0 · Vacuum Wars 8.5. Pet hair: Just A Dad Approved 9.2 · Vacuum Wars 7.6. Mopping: Just A Dad Approved 6.5 · Vacuum Wars 7.4. Obstacle avoidance: Just A Dad Approved 7.0 · Vacuum Wars 4.2 · the test sites disagree here.

    Measured by Just A Dad Approved (read on September 16, 2026) · Vacuum Wars (read on September 29, 2026).

    Measured 7.4, counted 7.1, pulled toward its station type’s average.

  • Owners’ ratings 25%–

    Owners’ ratings, 25%: none yet at the stores that ship to the United States, so this part is left out and the others count for more.

  • Features 15%8.6

    79 of 92 points for the facts the maker states.

  • Price never countsA sale can’t lift a model. Today’s lowest price sits beside the score, checked every morning.
  • No test, no rankOnly robots a test site has tested are ranked. The rest get a provisional score.
  • Reviewers beside, not insideReviewers’ picks are shown next to the score and do not count in it.

How we work this out →

The testers’ picks

Positions and labels, never text. These picks are shown beside the score and do not count in it. How the score comes about is on the method page.

Frequently asked questions about the Dreame L40s Ultra

What has the Dreame L40s Ultra cost?

Since we began measuring on October 7, 2026, its lowest price was $399 (November 9, 2026, at Dreame (brand store)) and its highest $569 (October 13, 2026). On average it cost $529.

Does the Dreame L40s Ultra wash and dry its own mop?

Yes, with water at 167 °F (75 °C). Drying is done with warm air.

How high a threshold can the Dreame L40s Ultra climb?

Thresholds up to 0.9 in (22 mm), the maker says. With its climbing system it also takes two steps close together, up to 1.6 in (40 mm) in all.

Is the Dreame L40s Ultra suitable for pet hair?

Yes, the maker says. The brush guides hair to the side instead of winding it around the roller.

How long does the Dreame L40s Ultra run on one charge?

220 minutes on its quietest setting. If the battery runs out sooner, it recharges and carries on where it was. A full charge takes 3.5 hours.

Does the Dreame L40s Ultra lift its mop on carpet?

Yes, it lifts the mop 0.4 in (10.5 mm) as soon as it drives onto carpet. It can also leave the mop behind in the station, so the carpet stays dry.

The maker

Dreame

Dreame Technology makes robot vacuums and mops, cordless stick vacuums, wet and dry vacuums and hair dryers. Its founder, Yu Hao, started the business in 2015 with work on high-speed digital motors, and its headquarters and factory are in Suzhou, China. At the end of 2017 Dreame joined Xiaomi's ecosystem of partner companies.

dreametech.com

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