38 facts in comparison
Dreame X40 Ultra vs ECOVACS DEEBOT X8 PRO OMNI vs Roborock Qrevo Curv 2 Flow
This comparison puts the Dreame X40 Ultra, ECOVACS DEEBOT X8 PRO OMNI and Roborock Qrevo Curv 2 Flow side by side — three Robot Vacuums measured against the same 38-spec sheet, with every meaningful gap scored and explained. On our weighted VS Score the Roborock Qrevo Curv 2 Flow finishes ahead, 90 to 83 — a solid lead.
The single biggest measurable gap is suction power: 12,000 Pa vs 18,000 Pa vs 20,000 Pa. A transparency note before you dive in: the spec sheets are Dreame X40 Ultra 84%, ECOVACS DEEBOT X8 PRO OMNI 87% and Roborock Qrevo Curv 2 Flow 71% complete. Anything unverified shows as Unknown and is left out of the scores — we never estimate a missing value.
Category strengths
- Dreame X40 Ultra
- ECOVACS DEEBOT X8 PRO OMNI
- Roborock Qrevo Curv 2 Flow
Spec wins (head-to-head)
- Dreame X40 Ultra 5
- ECOVACS DEEBOT X8 PRO OMNI 2
- Roborock Qrevo Curv 2 Flow 3
Why Dreame X40 Ultra?
- 3 mm more threshold clearance ?22 mm vs 19 mm
- 66 min more runtime ?260 min vs 194 min
- Has automatic mop removal ?
- 1 mm less height ?97 mm vs 98 mm
- 80 ml more dustbin capacity ?300 ml vs 220 ml
Why ECOVACS DEEBOT X8 PRO OMNI?
- 8 °C more warm-air drying temperature ?63 °C vs 55 °C
- 125 ml more water tank ?205 ml vs 80 ml
Why Roborock Qrevo Curv 2 Flow?
- 2,000 Pa more suction power ?20,000 Pa vs 18,000 Pa
- 4.5 mm more mop lift ?15 mm vs 10.5 mm
- Has Spot, Edge ?
Key real-world differences
The spec sheet pulls in both directions. These are the gaps big enough to shape the decision — with the actual figures, and what each one means in real-world use.
- Suction powerCleaning12,000 Pa vs 18,000 Pa vs 20,000 Pa — 40% more for the Roborock Qrevo Curv 2 Flow
Higher suction lifts more dirt from carpets and hard floors.
- Automatic mop removalBattery & dockYes vs No vs — — only the Dreame X40 Ultra has it
The dock can detach the mop pads before vacuum-only or carpet cleaning.
- RuntimeBattery & dock260 min vs 194 min vs — — 25% more for the Dreame X40 Ultra
How long it cleans on a full charge.
- Water tankDesign80 ml vs 205 ml vs — — 2.6× more for the ECOVACS DEEBOT X8 PRO OMNI
The onboard clean-water capacity for mopping.
- Cleaning modesCleaningAuto, Zone, Room vs Auto, Zone, Room vs Auto, Spot, Edge, Zone, Room — advantage Roborock Qrevo Curv 2 Flow
The available cleaning modes.
Which one should you buy?
There is no single answer — it depends on what you will actually use it for. Match your priority to the pick below.
- Best for battery & dock Dreame X40 Ultra takes the category 93 to 76 — driven by automatic mop removal (Yes vs No vs —).
- Best for cleaning Roborock Qrevo Curv 2 Flow takes the category 100 to 79 — driven by suction power (12,000 Pa vs 18,000 Pa vs 20,000 Pa).
- Best for design Dreame X40 Ultra takes the category 75 to 44.
- The safe all-rounder Roborock Qrevo Curv 2 Flow wins more of the categories that carry real weight, topping the overall VS Score at 90.
Where each one falls short
Dreame X40 Ultra
- Suction power: 12,000 Pa vs 18,000 Pa vs 20,000 Pa
- Water tank: 80 ml vs 205 ml vs —
- Cleaning modes: Auto, Zone, Room vs Auto, Zone, Room vs Auto, Spot, Edge, Zone, Room
- 6 specs are unreported (shown as Unknown) and excluded from its scores.
ECOVACS DEEBOT X8 PRO OMNI
- Automatic mop removal: Yes vs No vs —
- Runtime: 260 min vs 194 min vs —
- Dustbin capacity: 300 ml vs 220 ml vs —
- 5 specs are unreported (shown as Unknown) and excluded from its scores.
Roborock Qrevo Curv 2 Flow
- Threshold clearance: 22 mm vs — vs 19 mm
- Warm-air drying temperature: — vs 63 °C vs 55 °C
- 11 specs are unreported (shown as Unknown) and excluded from its scores.
What matters to you?
Drag the sliders to weight each category and re-rank the products to suit your priorities.
Score breakdown
How the VS Score works — and what it can’t tell you
Every measurable spec is scored relative to this matchup: the best value here earns 100%, the worst 0%, and everything between scales linearly. Each spec then 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 category scores above are the weighted results inside each group, and the overall VS Score rolls all of them together; the evidence line under each category names the specs that actually decided it.
Unknown values are never estimated. A spec a product doesn’t report simply drops out of that product’s scoring — it isn’t penalised with a guess — and a spec only one side reports can never produce a “win”. The trade-off is honest but real: a thinner spec sheet means a score built on fewer data points, which is why the completeness figures are 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 scores as a structured summary of what can be measured, read the caveats under each key difference, and use the weight tuner to re-rank the comparison by what matters to you.
Cleaning
Higher suction lifts more dirt from carpets and hard floors.
Also mops hard floors.
The physical mopping system used by the robot.
Lifts the mop over carpet to avoid soaking it.
Automatically recognises carpet and adapts suction or mopping behaviour.
Extends a side brush or mop closer to walls and into corners.
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.
The dock can detach the mop pads before vacuum-only or carpet cleaning.
The maximum published hot-water temperature used to wash the mop.
The maximum published warm-air temperature used to dry the mop.
The dock automatically doses cleaning solution.
Detects dirty wash water or floor stains and automatically re-washes or re-mops.
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.
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 August 2, 2026.
- Data completeness: Dreame X40 Ultra 84%, ECOVACS DEEBOT X8 PRO OMNI 87% and Roborock Qrevo Curv 2 Flow 71% of the 38 specs in this category. Anything we could not verify is shown as Unknown — never estimated — and is excluded from all scores.
- 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.
What reviewers say
The bottom line
The Roborock Qrevo Curv 2 Flow takes the top spot with a VS Score of 90, ahead of the Dreame X40 Ultra (83) and the ECOVACS DEEBOT X8 PRO OMNI (81). The Roborock Qrevo Curv 2 Flow stands out for Cleaning. The Dreame X40 Ultra stands out for Battery & dock and Design.
