Dreame L40s Ultra
Rank 37 of 66 robots with an all-in-one station in our ranking, tested by Vacuum Wars.in our ranking, tested by Vacuum Wars ★ 4.1 · 281 reviews
Score 6.7 out of 10
Lab tests, 60% of the score: 6.7, measured by Vacuum Wars.
Owners’ ratings, 25%: 5.4, from 281 ratings averaging 4.1 stars at Amazon.
Features, 15%: 8.6, 79 of the 92 points for the facts the maker states.
Price does not count, so a discount never lifts a model. Only robots a lab has tested are ranked.
The highest score today is 7.6.
- up to 100 daysDust bag lastslonger than 38 of 64
Is the Dreame L40s Ultra right for your home? Find out in 7 questions →
Before you buy, compare it with 2 recommended alternatives
Beside it, two models on sale today that come closest to it on score and price, with the same kind of station where we have them.
Green is the best of these 3, also when they share the lead.
| This model Dreame L40s Ultra Best on 4 facts | Nearly as good, 34% cheaper MOVA P10 Pro Ultra Best on 4 facts | Higher score, 7% cheaper Yeedi M14 Plus Best on 2 facts | |
|---|---|---|---|
| Price and ranking | |||
| Lowest price | $484Amazon.com | $320Amazon.com best | $449Amazon.com |
| Score | best | ||
| Rank | rank 37 of 66 with an all-in-one station | rank 42 of 66 with an all-in-one station | rank 30 of 66 with an all-in-one station |
| Customer rating | ★ 4.1 · 281 reviews | ★ 3.9 · 1,871 reviews | ★ 4.2 · 3,141 reviews best |
| Mopping | |||
| Mop type | spinning pads | spinning pads | roller mop |
| Mop lift on carpet higher is better | 0.4 in (10.5 mm) best | 0.4 in (10.5 mm) best | 0.4 in (10 mm) |
| Automatic mop detach | yes | – | – |
| Washes the mop same on all | yes | yes | yes |
| Hot-air drying same on all | yes | yes | yes |
| Station | |||
| Station same on all | all-in-one station | all-in-one station | all-in-one station |
| Dust bag lasts longer is better | up to 100 days best | up to 75 days | up to 75 days |
| Plumbing hookup | yes | yes | – |
| Brush and obstacles | |||
| Anti-tangle brush | yes | – | yes |
| Obstacle avoidance | 3D sensor (structured light) | AI camera | – |
| Climbs thresholds up to higher is better | 0.9 in (22 mm) best | 0.9 in (22 mm) best | 0.8 in (20 mm) |
| Size, noise and age | |||
| Robot height lower is better | 3.8 in (9.7 cm) best | 3.8 in (9.7 cm) best | 3.9 in (9.9 cm) |
| On the market since | August 2025 | March 2025 | May 2025 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Prices per store
On October 3, 2026 the lowest price for the Dreame L40s Ultra is $484 at Amazon.com, shipping to the United States included. In our ranking it is rank 37 of 66 with an all-in-one station, with a score of 6.7 out of 10.
All prices include shipping to the United States. Sales tax is added at checkout. We may earn a commission when you buy through these links. It never changes our ranking.
| Store | Color | Price | Delivery time and returns | Reviews | Checked | Link to the store |
|---|---|---|---|---|---|---|
 Amazon.com whitelowest price | white | $484$449 with Primelowest price since Sep 1: $484 | about 1–5 dayslowest price | ★ 4.1 (281) | 3 hours ago | Visit store ↗ |
Price history
What the tests like and dislike about the Dreame L40s Ultra
Pros
- Among the strongest robots tested at deep cleaning carpet Vacuum Wars ↗
- Dual rubber brush kept long hair completely untangled Vacuum Wars ↗
- Extending side brush clearly improved dirt removal from corners Vacuum Wars ↗
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
The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.
Dreame · on the market since August 2025
Consumables: a 3.2 l dust bag in the station, which lasts up to 100 days.
Dimensionsrobot and dock
From the published dimensions. The dock needs a spot 13.4 in wide and 18 in deep.
Suction and brushes 6 facts
- Suction power
Suction in pascal, as the maker measures it. More pascal helps on carpet, but it says little about how well the robot picks grit off a hard floor.
- 19,000 Pa
- Anti-tangle brush
A brush that guides hair to the side instead of letting it wind around the shaft. It saves the cutting work in homes with long hair or pets.
- yes
- Extending side brush
The side brush swings out in a corner or along a baseboard, so the dust there is swept in too.
- yes
- Carpet detection
The robot notices when it drives onto a carpet. Most then raise their suction, and a mopping robot lifts its mop or leaves it at the dock.
- detects carpet
- Suitable for pet hair
Whether the robot copes with pet hair: a brush that hair does not wind around and a dock that empties the bin for you. Where the maker does not say so itself, we read it from those two.
- yes
- Dirt detection
A sensor notices where more dirt lies, at the doormat for example, and the robot cleans that patch longer or a second time.
- yes
Mopping 4 facts
- Mop type
How the mop is built: flat pads, two spinning discs or a roller. Discs press harder on dried-on dirt, a roller rinses itself while it works.
- spinning pads
- Mop lift on carpet
How far the robot lifts the mop when it drives onto a carpet. From about 0.4 in (10 mm) a medium pile stays dry.
- 0.4 in (10.5 mm)
- Mop extends to the edges
The pad slides out along a wall or a baseboard, so the last few inches are mopped as well.
- yes
- Automatic mop detach
The robot leaves the mop at the dock before it vacuums a carpet, so the carpet never gets wet.
- yes
Dock 13 facts
- Empties the dust bin
The dock empties the robot’s dust bin, usually after every run. You only empty the dock’s bag or bin.
- yes
- Bagless
The dock collects dust in a bin instead of a disposable bag. No bags to buy, but you empty it yourself.
- no
- Dust bag capacity
How much the dust bag in the dock holds.
- 3.2 l
- Dust bag lasts
How long the maker says a dust bag lasts with daily use. With pets or a lot of carpet it is shorter.
- up to 100 days
- Washes the mop
The dock washes the mop for you, so you do not rinse it by hand.
- yes
- Wash temperature
How hot the dock washes the mop. Above 140 °F (60 °C) grease comes off, which is what keeps a mop from smelling.
- 167 °F (75 °C)
- Dries the mop
The dock dries the mop afterwards, so it does not sit there wet and start to smell.
- yes
- Hot-air drying
Drying is done with warm air instead of cold. It is faster and it helps against smell.
- yes
- Dispenses detergent
The dock mixes detergent into the water itself, from its own bottle.
- yes
- Plumbing hookup
The dock can be connected to the tap and the drain, so you never fill or empty a tank. It does need a connection nearby.
- yes
- Clean water tank
The clean water tank in the dock, which wets the mop.
- 4.5 l
- Dirty water tank
The tank that catches the dirty water from the mop. You empty this one yourself.
- 4 l
- Dock size (w × d × h)
The width, depth and height of the dock. Measure the spot you have in mind, and leave room for the lid and for the robot driving in.
- 13.4 × 18 × 23.2 in (34 × 45.7 × 59 cm)
Navigation and obstacles 5 facts
- Navigation
How the robot maps your home and follows that map. Lidar measures with a laser and works in the dark, a camera looks along and recognizes more.
- LiDAR turret
- Obstacle avoidance
How the robot sees loose things on the floor, such as cables, socks or a pet accident. A camera with depth sensing sees more than a bumper that reacts on contact.
- 3D sensor (structured light)
- Climbs thresholds up to
The highest threshold the robot takes, as the maker states it. Measure your own: the step into a bathroom or onto a balcony is often higher.
- 0.9 in (22 mm)
- Room-by-room cleaning
You pick one or more rooms on the map in the app, and the robot cleans only those.
- yes
- Recharge and resume
When the battery runs low in the middle of a run, the robot recharges and then carries on where it stopped.
- yes
Robot 2 facts
- Robot height
How tall the robot is. It decides whether it fits under your sofa, bed or cabinet.
- 3.8 in (9.7 cm)
- Dust bin in the robot
How much dust the robot holds before you empty it. It matters less with a self-emptying dock, which empties the bin after every run.
- 310 ml
Battery 2 facts
- Battery capacity
The capacity of the battery. It hints at the runtime, but how much the robot draws counts just as much.
- 5,200 mAh
- Runtime per charge
How long the robot cleans on one charge, at its quietest setting. After that it recharges and carries on where it stopped.
- 220 min
Sources: dreametech.com
Our score
Confidence: medium. One lab and fewer than 300 owners’ ratings. The highest score today is 7.6.
-
Lab tests 60%6.7
5 cleaning abilities measured, on one scale for every robot.
- Deep clean on carpet8.4
- Pet hair7.9
- Mopping6.5
- Obstacle avoidance2.1
- Navigation7.2
Measured by Vacuum Wars (read on September 29, 2026).
Measured 6.7, counted 6.7: the fewer labs stand behind a result, the more we pull it toward the average of its station type.
-
Owners’ ratings 25%5.4
281 ratings, 4.1 stars on average, at Amazon.
-
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 lab 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.
The testers’ picks
- Vacuum Wars · Position 40 of 151September 26, 2026
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.
