Introduction
We're looking at three high-end models that represent the best of the current market. The Dreame L40s Pro Ultra arrives in 2025 as Dreame's most recent offering, whilst the Roborock Qrevo Master arrived in 2024 with the experience of the world's leading brand in cleaning robotics. The Dreame X40 Ultra, also from 2024, completes this trio of devices designed for users seeking total automation in homes of any size.
All three models incorporate a multifunction base that washes and dries the mops, as well as automatically emptying the dust container. We're talking about robots prepared for homes with pets, large surfaces and users who want to forget about daily maintenance.
Power and Suction
The most striking difference appears in suction power. The Dreame L40s Pro Ultra leads with 19,000 Pa, a figure that practically doubles the 10,000 Pa of the Roborock Qrevo Master. The Dreame X40 Ultra sits at 12,000 Pa, an intermediate figure but sufficient for most situations. In practice, this translates to greater capacity for thick carpets and floors with ingrained dirt.
All three devices feature a dual main brush, a design that reduces tangles from long hair and improves pickup on carpets. All can lift this brush during mopping, preventing wet dirt from adhering to the bristles.
Where important differences appear is in the side brush. Both Dreame models lift this brush when mopping and incorporate an anti-tangle system, something the Roborock Qrevo Master doesn't offer. All three include an extendable side brush to improve cleaning in corners. For homes with long-haired pets, these features can make a difference in weekly maintenance.
Mopping
All three robots employ a two rotating mop system, a design that offers better mopping than traditional drag mops. All extend the mops towards the edges, although the Dreame models add the Roboswing system, a chassis rotation movement that helps get the mop under overhangs and furniture.
Mop lifting reaches 10.5 mm on the Dreame models and 10 mm on the Roborock, sufficient to climb onto medium-thickness carpets without wetting them. All three detect dirt both on the mops and on the floor, activating additional washing or scrubbing cycles when necessary.
A practical difference: only the Dreame models automatically remove the mops at the base when you schedule vacuum-only sessions. The Roborock Qrevo Master requires you to remove them manually if you don't want them dragging over dry carpets.
The bases of all three wash the mops with hot water and dry them with hot air, processes that eliminate bacteria and prevent bad odours. The Dreame L40s Pro Ultra incorporates the third generation of tray self-cleaning, the X40 Ultra the second generation and the Roborock version 1.0. In day-to-day use, this translates to less need to manually clean the washing tray.
Navigation System
All three devices combine LiDAR turret with dual front camera and 3D laser sensor, a configuration that guarantees precise mapping and real-time obstacle avoidance. All recognise pets, feature LED for night vision and allow remote access to the camera from your mobile.
Recognition capacity varies significantly. The Dreame L40s Pro Ultra identifies up to 180 different types of obstacles, the X40 Ultra reaches 120 and the Roborock Qrevo Master stops at 62. This affects the precision with which the robot adapts its behaviour: avoiding cables, dodging toys or detecting delicate areas.
Only the Dreame models detect curtains, avoiding getting tangled in them. The Dreame L40s Pro Ultra and X40 Ultra also incorporate AI stain recognition, activating intensive mopping in specific areas without manual intervention. The Roborock Qrevo Master doesn't include this function.
In terms of processing, the Roborock features the RR Mason 11.0 algorithm, whilst the Dreame X40 Ultra has AI Sage 11.0. The L40s Pro Ultra doesn't specify CPU in the table, although its recognition capacity suggests powerful hardware.
Autonomy and Battery
The Dreame X40 Ultra stands out with a 6,400 mAh battery that allows it 194 minutes of autonomy. The Dreame L40s Pro Ultra and Roborock Qrevo Master feature 5,200 mAh, with autonomies of 220 and 180 minutes respectively. The difference in operating times with similar capacities is explained by software optimisations and component efficiency.
For homes of up to 200 m², any of the three completes cleaning without intermediate recharges. On larger surfaces, the Dreame L40s Pro Ultra offers greater margin thanks to its 220 minutes of autonomy.
Smart Functions
The ability to overcome obstacles varies between models. The Dreame X40 Ultra can climb steps of up to 22 mm, the Roborock Qrevo Master reaches 20 mm and the Dreame L40s Pro Ultra overcomes simple steps without specifying exact height. This is useful for transitions between rooms with small level changes or for climbing onto thick carpets.
The Dreame L40s Pro Ultra and Roborock Qrevo Master incorporate their own voice assistant, allowing you to give commands directly to the robot without going through your mobile. All three are compatible with Alexa and Google Home for integration into home automation ecosystems.
Multifunction Cleaning Base
The Dreame models include a detergent tank in the base, which doses automatically during mop washing. The Roborock Qrevo Master lacks this function, requiring you to add product manually to the water tank if you want to use it.
The dust bag capacity reaches 3.2 litres in the Dreame models versus 2.7 litres in the Roborock. In practice, this can mean emptying the bag every two months instead of every month and a half. The clean water tanks are 4.5 litres in the Dreame models and 4 litres in the Roborock; the dirty water ones 4 and 3.5 litres respectively.
Both Dreame models offer an optional plumbing connection kit, which is purchased separately and allows automation of water filling and emptying. The Roborock doesn't have this option.
The bases of the Dreame L40s Pro Ultra and X40 Ultra measure 590.5 mm in height, whilst that of the Roborock Qrevo Master reaches 521 mm, being more discreet in reduced spaces. The depth is 456.7 mm in the Dreame models and 487 mm in the Roborock.
Dimensions
The Dreame X40 Ultra measures 97 mm in height, allowing it to access under furniture of 10-11 cm. The Roborock Qrevo Master reaches 103 mm and the Dreame L40s Pro Ultra 103.8 mm, limiting access under low sofas or beds with little distance to the floor.
The diameter is practically identical: 350 mm in the Dreame models and 353 mm in the Roborock. These measurements are standard in high-end robots and guarantee stability during navigation.
The robot's dust container reaches 300 ml in the Dreame models and 220 ml in the Roborock, although as all three have auto-emptying at the base, this difference barely affects real use. The robot's water tanks are 80 ml in all models.
Real-World User Experience
For homes with long-haired pets, the Dreame models offer an advantage thanks to the anti-tangle side brush and its lifting during mopping. The dual main brush present in all three reduces maintenance, but the extra power of the L40s Pro Ultra facilitates the pickup of hair embedded in carpets.
In homes with thick carpets, the 10-10.5 mm mop lifting allows transitions without problems. The step-climbing ability of the X40 Ultra (22 mm) is useful in homes with level changes between rooms.
For spaces with low furniture, the Dreame X40 Ultra makes a difference with its 97 mm height. If you need the robot to clean under low-height beds or sofas, it's worth measuring before deciding.
The autonomy of the Dreame L40s Pro Ultra (220 minutes) and the battery of the X40 Ultra (6,400 mAh) are better suited to large homes of more than 200 m². The Roborock Qrevo Master, with 180 minutes, covers surfaces of up to 180-200 m² without problems.
In homes with many obstacles, cables or toys on the floor, the 180-object recognition of the L40s Pro Ultra reduces interruptions. AI stain detection in the Dreame models also saves manual interventions in kitchens or dining rooms.
Conclusion: Which to Choose?
Choose the Dreame L40s Pro Ultra if you're looking for maximum suction power (19,000 Pa) and the most advanced obstacle recognition (180 types). Its 220-minute autonomy and detergent tank make it an ideal option for large homes with pets and users who value total automation. The third generation of tray self-cleaning reduces maintenance to a minimum.
Choose the Roborock Qrevo Master if you prioritise the reliability of the world's leading brand and need a more compact base (521 mm height). Although it has lower suction power and recognises fewer obstacles, it offers excellent performance for most homes. It's the most balanced option if you don't need the extra functions of the Dreame models and prefer the Roborock ecosystem and support.
Choose the Dreame X40 Ultra if you need a robot that fits under low furniture (97 mm) and value the greater battery capacity (6,400 mAh). With 12,000 Pa of suction, ability to overcome 22 mm steps and detergent tank, it offers excellent value for features. It's the most versatile option for homes with low furniture and level changes between rooms.
