Two very different approaches to the same job: the Dreame L40 Ultra leans on high suction, dual spinning mop pads, and a smarter obstacle-avoidance stack, while the Roborock S8 Pro Ultra counters with a dual rubber brushroll, a larger onboard water tank, and a documented 3,229 sq ft of coverage in a single run. Homes with pets, thick rugs, and cluttered floors will get more out of the Dreame, especially since it costs noticeably less. Large single-level hard-floor spaces where run length matters most are where the Roborock still makes sense.
Suction numbers alone would make this look lopsided: 11,000 Pa against 6,000 Pa. But the Roborock S8 Pro Ultra pairs its lower figure with a dual rubber brushroll, a design that has a real track record on carpet and long hair, so the gap on paper is wider than the gap on your floors. The Dreame L40 Ultra answers with extending side brushes and mop arms, automatic mop pad detachment for carpet, and an obstacle-avoidance system that layers AI, a camera, 3D structured light, and an LED lamp. Both self-empty and self-wash. The deciding factors sit elsewhere.
Dreame L40 Ultra
out of 10Roborock S8 Pro Ultra
The two land close overall, 7.6 for the Dreame against 7.4 for the Roborock, so this comes down to what you value. Navigation is where they split hardest: 8.2 versus 6.3, thanks to the Dreame's multi-sensor obstacle system. Cleaning flips the other way, 6.4 versus 7.0, with the Roborock's dual rubber brushroll earning that edge. Features sit nearly level at 9.5 and 9.7, and both share an identical 5.5 value rating.
Start with the brushes. The Roborock uses two rubber brushrolls, the Dreame a single rubber one paired with much higher suction and an extending side brush that reaches into corners. Mopping splits along technology lines: the Dreame runs dual spinning pads at 220 RPM that actively scrub, plus an extending mop arm and 32 moisture settings, versus the Roborock's single vibrating pad at 3,000 vibrations per minute with 6 N of downward pressure and a larger onboard water tank. Carpet handling favors the Dreame too, with a 10.5 mm mop lift against 5 mm and automatic pad detachment before it moves onto rugs. Then there's the dock: only the Dreame adds detergent automatically during pad washing, and it holds a bigger dust bag at 3.2 L versus 2.5 L.
The Dreame's 11,000 Pa nearly doubles the Roborock's 6,000 Pa, and its extending side brush swings out to grab debris along baseboards. The Roborock counters with dual rubber brushrolls and a slightly larger 350 mL dustbin, which keeps it competitive on carpet despite the lower suction number.
Dual spinning pads give the Dreame genuine scrubbing action with pressure behind it, a step up from the Roborock's single vibrating pad, and its mop arm extends to reach edges. The Roborock's advantages are practical rather than technological: 3,000 vibrations per minute, 6 N of pressure, and a larger onboard water tank so it refills less often mid-run.
Pet homes lean Dreame here. The 11,000 Pa pull, smart dirt detection that ramps power over heavily soiled spots, and a 3.2 L dust bag versus 2.5 L mean fewer bag changes during heavy shedding season.
Both use LiDAR, but the Dreame stacks AI, a camera, 3D structured light, and an LED lamp for dark rooms, versus 3D structured light alone on the Roborock. It also clears 22 mm obstacles compared to 20 mm, so thick rug edges and cable bundles give it less trouble.
Both docks empty the robot and wash the mop pads, but only the Dreame doses detergent into the wash cycle, which gets the pads cleaner than water alone. Its 3.2 L dust bag also stretches further than the Roborock's 2.5 L before you swap it.
The Roborock covers 3,229 sq ft in a single run, enough for most whole-home layouts without needing a mid-clean recharge. That's a real advantage if you have a big open floor plan and want the job done in one pass.
Both handle no-go zones, multi-level maps, and voice control through Amazon, Google, and Apple. The Dreame adds built-in voice commands you can give the robot directly, plus smart dirt detection that adjusts cleaning on the fly.
| Feature | Dreame L40 Ultra | Roborock S8 Pro Ultra |
|---|---|---|
| Suction Power | 11,000 Pa | 6,000 Pa |
| Main Brush Type | Single (rubber) | Dual (rubber) |
| Mop Type | Dual spinning mop pads | Vibrating mop pad |
| Auto Detergent Dispensing | Yes | No |
| Camera | Yes | No |
| Smart Dirt Detection | Yes | No |
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Both machines automate nearly everything, so nobody comes away disappointed. The Dreame L40 Ultra makes more sense for cluttered, pet-heavy homes and costs less doing it. The Roborock S8 Pro Ultra suits big hard-floor layouts where one long run and a proven dual brushroll matter more.
