# Dreame L40 Ultra Gen 2 vs Roborock QV 35S

As of Nov 4, 2026, the Dreame L40 Ultra Gen 2 costs $750 and the Roborock QV 35S costs $550, so the Roborock QV 35S is $200 cheaper. Pick the Dreame L40 Ultra Gen 2 for tidy hard floor homes that want strong mopping. Pick the Roborock QV 35S for mostly hard floor homes on a mid budget.

Prices checked Nov 4, 2026. HTML version: https://robotsforthat.com/vs/dreame-l40-ultra-gen-2-vs-roborock-qv-35s/

## Side by side

| | Dreame L40 Ultra Gen 2 | Roborock QV 35S |
|---|---|---|
| Price | $750 | $550 |
| 3 year cost | $790 | $652 |
| Our score | Not scored yet | Not scored yet |
| Rank in Floors | #70 | #67 |
| Status | on sale | on sale |
| Warranty | 3 years (Dreame US store) | 1 year limited (Roborock US store) |
| Suction | 25,000 Pa claimed (Dreame); Vacuum Wars measured 0.79 kPa bench suction against a 0.99 kPa average, and Vacuum Chef measured 11.5 CFM airflow against a 9.0 average | 10,000 Pa (Roborock) |
| Navigation | LDS LiDAR, up to 4 maps (Dreame); Vacuum Wars measured 0.84 m2 per minute, faster than its 0.72 average | PreciSense LiDAR (Roborock); Ideal Home saw about 5 min mapping per floor |
| Obstacle avoidance | 3D structured light only; the RGB camera of the original L40 Ultra was removed (Dreame, Vacuum Wars); Vacuum Wars saw it avoid 2 of 24 objects and Vacuum Chef scored 30% | Reactive Tech structured light (Roborock); Ideal Home saw it bump a dumbbell once, then avoid it; Tom's Guide rated avoidance strong |
| Mopping | Dual spinning mops, 10.5 mm lift, 4 cm extension, no auto removal (Dreame); Vacuum Wars scored dried stains 144 against a 108 average | Dual spinning mops at up to 200 RPM with auto lift (Roborock); Tom's Guide found it handled mud and daily spills but left some oily residue |
| Self empty | Yes, 3.2 L dust bag, up to 100 days (Dreame) | Yes, 2 L bag, up to 7 weeks per Roborock (Ideal Home) |
| Dock features | Auto empty, mop wash, hot air drying, auto water refill, 4.5 L clean and 4.0 L dirty tanks; detergent dispenser sold separately for $39.99 (Dreame). Dreame lists hot water mop cleaning, but Vacuum Wars says Gen 2 washes with room temperature water | Auto empty, auto refill, mop washing, cold air drying, detachable base (Roborock) |
| Runtime | Up to 231 min in quiet vacuum mode, up to 1,679 sq ft (Dreame); Vacuum Wars estimated about 1,290 sq ft per charge | Up to 180 min (Tom's Guide, Ideal Home); Ideal Home had about 40% battery left after a whole house clean |
| Dustbin | 250 ml robot bin plus 3.2 L dock bag (Dreame) | n/a |
| Height | 3.82 in (97 mm) (Dreame) | 3.80 in (Roborock) |
| Pet hair | Vacuum Wars measured 69% flattened pet hair pickup and 67% hair wrap on its 7 in hair test; carpet sand removal was 90% | Tom's Guide measured 92% hair pickup on hardwood, 60% on low pile carpet and 40% on high pile carpet |
| App | Dreamehome app with Alexa, Siri, Google Home and Apple Watch; Matter planned in an update (Dreame) | Roborock app; 2.4 GHz Wi-Fi only (Roborock); Ideal Home found the app buggy at times |
| Threshold | 0.79 in (2 cm) (Dreame) | Up to 2 cm (Roborock) |
| Noise | Vacuum Chef measured 73 dB at max suction, about average | 64 dB Balanced and 55 dB mop only (Roborock); Tom's Guide heard about 60 dB vacuuming and 55 dB mopping |
| Best for | tidy hard floor homes that want strong mopping | mostly hard floor homes on a mid budget |
| Skip if | you have pets with long hair or a cluttered floor | you have high pile carpet or heavy shedding pets |

## What reviewers found

### Dreame L40 Ultra Gen 2

- Vacuum Wars (3.11 Vacuum Wars stars): Dried stain score 144 (108 average), 90% carpet sand removal, but 69% pet hair pickup, 67% hair wrap and only 2 of 24 obstacles avoided. Estimated about 1,290 sq ft per charge. [Source](https://vacuumwars.com/dreame-l40-ultra-gen-2-review/)
- Vacuum Chef: Measured 11.5 CFM airflow, 90% coffee, 60% sand and 98% cat litter pickup, 73 dB at max and a 30% obstacle avoidance score against a 66% average. Called it a rebalancing rather than an upgrade. [Source](https://vacuumchef.com/?p=12466)

### Roborock QV 35S

- Tom's Guide: On hardwood it picked up 92% hair, 94.5% puffed rice and 98% flax seeds. On high pile carpet it got 40% hair and 38.5% flax seeds. About 55 dB mopping and 60 dB vacuuming. Called it ideal for hardwood homes. [Source](https://www.tomsguide.com/home/roborock-qv-35s-review)
- Ideal Home: Handled rice, flour, ketchup and dog hair on hard floors, mapped each floor in about 5 min, and had about 40% battery left after the whole house. Weaker on carpet and dog hair in rugs, and the app was buggy at times. [Source](https://www.idealhome.co.uk/house-manual/floorcare/roborock-qv-35s-robot-vacuum-with-mop-review)

## Questions buyers ask

### Which is better, the Dreame L40 Ultra Gen 2 or the Roborock QV 35S?

Pick the Dreame L40 Ultra Gen 2 for tidy hard floor homes that want strong mopping. Pick the Roborock QV 35S for mostly hard floor homes on a mid budget.

### Which is cheaper?

The Roborock QV 35S at $550, versus $750 for the Dreame L40 Ultra Gen 2, checked Nov 4, 2026. Over 3 years with running costs: $790 vs $652.

### What is the difference between the L40 Ultra Gen 2 and the QV 35S?

Suction: 25,000 Pa claimed (Dreame); Vacuum Wars measured 0.79 kPa bench suction against a 0.99… on the L40 Ultra Gen 2, 10,000 Pa (Roborock) on the QV 35S. Navigation: LDS LiDAR, up to 4 maps (Dreame); Vacuum Wars measured 0.84 m2 per minute, faster than… on the L40 Ultra Gen 2, PreciSense LiDAR (Roborock); Ideal Home saw about 5 min mapping per floor on the QV 35S. Obstacle avoidance: 3D structured light only; the RGB camera of the original L40 Ultra was removed (Dreame… on the L40 Ultra Gen 2, Reactive Tech structured light (Roborock); Ideal Home saw it bump a dumbbell once, then… on the QV 35S.

Full reviews: [Dreame L40 Ultra Gen 2](https://robotsforthat.com/robot/dreame-l40-ultra-gen-2/index.md), [Roborock QV 35S](https://robotsforthat.com/robot/roborock-qv-35s/index.md)