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Appliances head-to-head

Dreame X40 UltravsRoborock Q Revo

Roborock Q Revo edges Dreame X40 Ultra, 8.0 to 7.7. The 5 axes split 4-1, widest on Value at 1.3.

Dreame X40 Ultra

Dreame

7.7

Spec sheet pushed hard, and it shows in edges and corners other machines leave dirty.

Price and availability change constantly, so we don't quote them here — the link opens the current Amazon listing.

Roborock Q Revo

Roborock

8.0

Keeps the part of the flagship dock that actually earns its keep, at roughly half the money.

Price and availability change constantly, so we don't quote them here — the link opens the current Amazon listing.

Where they diverge

The widest gap is Value, Roborock Q Revo ahead 8.8 to 7.5. They come closest on Ease of use, 8.5 to 8.2. Left of center is Dreame X40 Ultra, right is Roborock Q Revo.

Dreame X40 Ultra versus Roborock Q Revo — axis scores out of 10Horizontal bar chart of editorial scores out of 10 across 5 axes. Bars for Dreame X40 Ultra run left from the axis labels, bars for Roborock Q Revo run right. Dreame X40 Ultra: Performance 9.0, Value 7.5, Durability 7.2, Ease of use 8.2, Quietness 6.5. Roborock Q Revo: Performance 7.8, Value 8.8, Durability 7.8, Ease of use 8.5, Quietness 7.2.Dreame X40 Ultra (left)Roborock Q Revo (right)PerformanceDreame X40 Ultra — Performance 9.0 out of 109.0Roborock Q Revo — Performance 7.8 out of 107.8ValueDreame X40 Ultra — Value 7.5 out of 107.5Roborock Q Revo — Value 8.8 out of 108.8DurabilityDreame X40 Ultra — Durability 7.2 out of 107.2Roborock Q Revo — Durability 7.8 out of 107.8Ease of useDreame X40 Ultra — Ease of use 8.2 out of 108.2Roborock Q Revo — Ease of use 8.5 out of 108.5QuietnessDreame X40 Ultra — Quietness 6.5 out of 106.5Roborock Q Revo — Quietness 7.2 out of 107.2Editorial score out of 10 — higher is better

Which one to pick

Take the Dreame X40 Ultra

Leads on Performance.

  • The grime line along your baseboards never seems to go away
  • You want maximum spec for the money and will manage the trade-offs

Take the Roborock Q Revo

Leads on Value, Durability, Ease of use and Quietness.

  • You want a self-washing dock without stepping up to flagship money
  • Hard floors and low-pile rugs, nothing thick
  • It is your first robot vacuum

What each one gets wrong

Dreame X40 Ultra

  • You need a fast local repair rather than a mail-in one
  • App stability and translation quality bother you

Roborock Q Revo

  • Cables, socks, and toys are usually on the floor
  • Thick carpet with pet hair worked deep into it

Specs, side by side

SpecDreame X40 UltraRoborock Q Revo
Suction12,000Pa5,500Pa
MoppingSpinning pads with side extensionDual spinning pads, auto-lift
DockEmpties, hot-water washes, hot-air driesEmpties, washes, warm-air dries
Edge handlingMop swings out along walls—
Obstacle avoidance—Infrared sensing, no camera

Rankings they both appear in

Questions

Dreame X40 Ultra or Roborock Q Revo — which should I buy?
Roborock Q Revo leads on Value, Durability, Ease of use and Quietness. If Performance matters more to you, take the Dreame X40 Ultra instead.
Is 0.3 a real difference?
Barely. Dreame X40 Ultra averages 7.7 and Roborock Q Revo averages 8.0, and the total is the plain average of 5 axes, so 0.3 is what one axis moving 1.5 looks like after averaging. The axis split, 4-1, tells you more.
Which one ranks higher in "A robot vacuum's pascals print well and predict little"?
Roborock Q Revo sits at #1 in "A robot vacuum's pascals print well and predict little", Dreame X40 Ultra at #4.