Introduction
The Roborock Qrevo Curv S5X and the Dreame X40 Ultra represent two premium cleaning solutions launched in 2024, both equipped with advanced multifunction bases that handle everything from automatic emptying to mopa washing and drying. These models sit firmly in the high-end segment, designed for users who want comprehensive automation without constant manual intervention.
The Qrevo Curv S5X brings Roborock's established reputation for reliability and precision, whilst the X40 Ultra from Dreame packs an impressive array of AI-driven features at a competitive price point. Both are suited to larger homes with mixed flooring, though their approaches to navigation and cleaning differ in meaningful ways.
Power and Suction
The Roborock Qrevo Curv S5X delivers a substantial 18,500 Pa of suction power, which makes a real difference when tackling embedded dirt in carpets or fine dust in tile grout. The Dreame X40 Ultra offers 12,000 Pa, still respectable but noticeably lower on paper. In practice, this gap matters most for homes with thick rugs or pets that shed heavily.
Where the models diverge significantly is in brush design. The Qrevo Curv S5X uses Roborock's DuoDivide anti-tangle system, which channels hair towards the central suction point to minimise tangles. The X40 Ultra relies on a simpler brush design but compensates with the ability to lift the main brush during mopping—a feature the Roborock lacks. This means the Dreame can avoid dragging a wet brush across carpets when transitioning between floor types.
The side brush setup is similar in that both models feature an extensible design for better corner coverage and anti-tangle construction. However, the Dreame takes it further by also lifting the side brush during mopping, reducing the chance of flicking dirty water onto walls or furniture. The Roborock does not elevate its side brush in this scenario.
Mopping
Both robots use dual rotating mopas, but the Dreame X40 Ultra adds a swinging motion (Roboswing) that allows the mopa to reach slightly under furniture edges and skirting boards. The Qrevo Curv S5X extends its mopas to clean edges but doesn't incorporate this lateral movement.
Mopa elevation is nearly identical: 10 mm on the Roborock, 10.5 mm on the Dreame. Either height is sufficient to avoid dragging wet mopas over low-pile rugs. The real standout feature on the X40 Ultra is its ability to automatically detach the mopas at the base when you want a vacuum-only session. The Qrevo Curv S5X requires manual removal if you wish to avoid mopping altogether.
Both bases wash the mopas with hot water and dry them using heated air, which helps prevent odours and bacterial growth. The Roborock employs a second-generation self-cleaning tray system, as does the Dreame. Where they differ is in detergent handling: the X40 Ultra includes a dedicated detergent dispenser, whilst the Qrevo Curv S5X does not. This means the Dreame can automatically dose cleaning solution during mopa washing, reducing the need to add it manually.
Dirt detection is present on both models, triggering additional passes or mopa rewashing when sensors identify stubborn grime. This feature proves especially useful in kitchens or high-traffic hallways.
Navigation System
The Roborock Qrevo Curv S5X uses a third-generation LiDAR turret for mapping and obstacle avoidance, paired with its SmartPlan 2.0 intelligence system and the RR Mason 11.0 processor. It's a proven setup that delivers accurate room mapping and efficient route planning.
The Dreame X40 Ultra takes a more comprehensive approach. Alongside its own third-generation LiDAR, it adds dual AI cameras and a front-mounted 3D laser sensor. This combination allows the robot to recognise up to 120 different obstacle types, including pets and curtains—two categories the Roborock does not specifically identify. The X40 Ultra also features an LED for night vision and permits remote access to its camera, turning it into a mobile home monitor when you're away. The Qrevo Curv S5X offers none of these visual features.
For households with pets or young children, the Dreame's AI-powered recognition can be genuinely helpful, adapting cleaning behaviour around animals or avoiding delicate items. The Roborock relies more heavily on its LiDAR and basic obstacle detection, which works well but lacks the nuanced recognition the Dreame provides.
Battery and Autonomy
Battery capacity favours the Dreame X40 Ultra at 6,400 mAh compared to the Roborock's 5,200 mAh. This translates to 194 minutes of runtime for the Dreame versus 180 minutes for the Roborock. The difference isn't dramatic, but it can mean the difference between completing a large home in one go or requiring a mid-clean recharge.
Neither manufacturer specifies charging time in the provided data, so it's difficult to assess how quickly each model recovers between sessions. For most users, the extra quarter-hour of autonomy on the X40 Ultra won't be a deciding factor unless you're covering exceptionally large floor areas in a single pass.
Smart Features
Obstacle-climbing ability is closely matched: the Roborock Qrevo Curv S5X can surmount thresholds up to 20 mm, whilst the Dreame X40 Ultra manages 22 mm. Both figures are excellent for navigating between rooms with raised doorways or transitioning onto thick rugs.
Neither model includes a robotic arm or proprietary voice assistant, though both integrate with Alexa and Google Home for external voice control. The Dreame's CleanGenius AI system and AI Sage 11.0 processor focus on intelligent cleaning patterns and stain recognition, whilst the Roborock's SmartPlan 2.0 emphasises efficient route mapping and adaptive cleaning modes.
Multifunction Base
Both bases handle automatic dust emptying, mopa washing with hot water, and heated air drying. The Roborock's dust bag holds 2.5 litres, the Dreame's 3.2 litres—a noticeable advantage if you prefer longer intervals between bag changes.
Water tank sizes also differ. The Qrevo Curv S5X carries 4 litres of clean water and 3 litres of dirty water, whilst the X40 Ultra increases this to 4.5 litres clean and 4 litres dirty. Larger tanks mean fewer refills during extended mopping sessions, particularly in bigger homes.
The Dreame offers an optional kit for connecting the base directly to household plumbing, automating water refilling and drainage. This kit is sold separately and isn't a core feature, but it's worth noting for users who want truly hands-off maintenance. The Roborock does not offer this option at all.
Neither base includes UV disinfection or automatic mopa replacement.
Dimensions
The robots themselves are nearly identical in size. The Roborock measures 352 mm in diameter and 98 mm tall, whilst the Dreame is 350 mm across and 97 mm high. That extra millimetre of clearance on the Dreame might allow it to slip under furniture the Roborock cannot, though the difference is marginal.
Base dimensions tell a different story. The Qrevo Curv S5X base is a compact cube at 450 mm wide, tall, and deep. The Dreame X40 Ultra base is narrower at 340 mm but taller at 590.5 mm and slightly deeper at 456.7 mm. If floor space is tight, the Dreame's slimmer footprint may fit better in corners or alcoves. If vertical clearance is limited—say, beneath a countertop—the Roborock's lower profile wins out.
Real-World Use
For larger homes with multiple floor types, the Dreame X40 Ultra's greater battery capacity and ability to lift both main and side brushes during mopping make it particularly well-suited. The automatic mopa removal at the base also simplifies switching between vacuum-only and mopping modes without manual intervention.
Households with pets benefit more from the Dreame's AI-powered recognition and dual cameras, which help the robot navigate around animals and avoid knocking over water bowls or toys. The Roborock's DuoDivide brush is excellent for minimising hair tangles, but it lacks the visual intelligence to adapt behaviour around pets in real time.
If maximum suction is a priority—perhaps you have thick carpets or deal with a lot of tracked-in dirt—the Roborock Qrevo Curv S5X's 18,500 Pa gives it a clear edge. This extra power can pull embedded debris from carpet fibres more effectively than the Dreame's 12,000 Pa.
The Dreame's detergent dispenser and larger dust bag reduce maintenance frequency, which appeals to users who want to minimise hands-on involvement. The Roborock requires manual detergent addition and more frequent bag changes, though its compact base may be easier to fit into smaller utility spaces.
Conclusion: Which One to Choose?
Choose the Roborock Qrevo Curv S5X if: you prioritise raw suction power and have thick carpets or heavy soiling. The DuoDivide anti-tangle brush is ideal for pet owners focused on minimising hair maintenance, and the compact base fits neatly into tighter spaces. If you prefer Roborock's established app ecosystem and don't need advanced AI camera features, this model delivers reliable, high-performance cleaning.
Choose the Dreame X40 Ultra if: you want the most comprehensive automation available, including automatic mopa removal, a built-in detergent dispenser, and the option to connect to household plumbing. The dual AI cameras and pet recognition make it the smarter choice for homes with animals or children, and the larger dust bag and water tanks reduce maintenance frequency. The ability to lift both main and side brushes during mopping also gives it an edge in mixed-floor environments. If you value cutting-edge AI features and don't mind a taller base, the X40 Ultra offers exceptional versatility at a competitive price.
