Comparison

Dreame X40 Ultra vs Roborock Qrevo Curv 2 Flow vs Xiaomi X20 Max

Detailed Technical Comparison

Best Score

1 / 8

Dreame X40 Ultra

7.5

Overall score

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Best value for money

Roborock Qrevo Curv 2 Flow

7.1

Overall score

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1 / 9

Xiaomi X20 Max

5.3

Overall score

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Scores

Dreame X40 Ultra

Overall score 7.5

Power and Battery 5.9

Brushing System 6.7

Mopping System 7.8

Cleaning Base 7.6

Navigation and Intelligence 8.8

Roborock Qrevo Curv 2 Flow

Overall score 7.1

Power and Battery 6.1

Brushing System 5.9

Mopping System 7.3

Cleaning Base 6.9

Navigation and Intelligence 7.0

Xiaomi X20 Max

Overall score 5.3

Power and Battery 4.0

Brushing System 2.4

Mopping System 4.9

Cleaning Base 6.0

Navigation and Intelligence 4.9

Detailed Technical Comparison

Key features organised by category

General Information

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Brand Different ?	Dreame X40 Ultra: Dreame	Roborock Qrevo Curv 2 Flow: Roborock	Xiaomi X20 Max: Xiaomi
Release date Different ?	Dreame X40 Ultra: 2024	Roborock Qrevo Curv 2 Flow: February 2026	Xiaomi X20 Max: 2024

Power and Battery

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Suction power Different ?	Dreame X40 Ultra: 12.000 Pa	Roborock Qrevo Curv 2 Flow: 20.000 Pa	Xiaomi X20 Max: 8.000 Pa
Battery capacity Different ?	Dreame X40 Ultra: 6.400 mAh	Roborock Qrevo Curv 2 Flow: 5.200 mAh	Xiaomi X20 Max: 5.200 mAh
Declared runtime Different ?	Dreame X40 Ultra: 194 min	Roborock Qrevo Curv 2 Flow: 242 min	Xiaomi X20 Max: 120 min
Fast battery charging Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No

Brushing System

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Main brush Different ?	Dreame X40 Ultra: Simple Silicone Brush	Roborock Qrevo Curv 2 Flow: DuoDivide Anti-Tangle Hair Brush	Xiaomi X20 Max: TriCut 3.0
Liftable main brush Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
Liftable side brush Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
Extendable side brush Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No
Anti-tangle side brush Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Yes, dual brush	Xiaomi X20 Max: No
Skirting board brush ?	Dreame X40 Ultra: No	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No

Mopping System

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Mopping type Different ?	Dreame X40 Ultra: Two Rotating Mops 180 RPM	Roborock Qrevo Curv 2 Flow: Roller 10.6 in (270 mm) 200RPM	Xiaomi X20 Max: Two Rotating Mops
Mop extension Different ?	Dreame X40 Ultra: Yes, with RoboSwing movement	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: Sí
Mop lifting Different ?	Dreame X40 Ultra: Yes, 0.4 in (10.5 mm)	Roborock Qrevo Curv 2 Flow: Yes, 0.6 in (15 mm) + Roller Cover	Xiaomi X20 Max: Yes, 0.4 in (10 mm)
Floor mopping temperature ?	Dreame X40 Ultra: Cold water	Roborock Qrevo Curv 2 Flow: Cold water	Xiaomi X20 Max: Cold water
Remove mops at base Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No
Mop dirt detection Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
Floor dirt detection Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No

Cleaning Base

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Auto-emptying of dust bin ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: Sí
Mop washing Different ?	Dreame X40 Ultra: Yes, with hot water at 158 °F (70°C)	Roborock Qrevo Curv 2 Flow: Yes, with hot water at 167 °F (75°C)	Xiaomi X20 Max: Yes, with hot water at 131 °F (55°C)
Mop drying Different ?	Dreame X40 Ultra: Yes, with hot air at 113 °F (45°C)	Roborock Qrevo Curv 2 Flow: Yes, with hot air at 131 °F (55°C)	Xiaomi X20 Max: Yes, with hot air
Washing tray self-cleaning Different ?	Dreame X40 Ultra: Yes, 2nd generation	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
UV disinfection ?	Dreame X40 Ultra: No	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No
Detergent tank Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No
Automatic mop changing ?	Dreame X40 Ultra: No	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No
Dust bag capacity Different ?	Dreame X40 Ultra: 3.2 L	Roborock Qrevo Curv 2 Flow: 2.7 L	Xiaomi X20 Max: 2.5 L
Clean water tank Different ?	Dreame X40 Ultra: 4.5 L	Roborock Qrevo Curv 2 Flow: 4 L	Xiaomi X20 Max: 4 L
Dirty water tank Different ?	Dreame X40 Ultra: 4 L	Roborock Qrevo Curv 2 Flow: 3.5 L	Xiaomi X20 Max: 3.8 L
Plumbing connection kit Different ?	Dreame X40 Ultra: Yes (purchased separately)	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No
Integrated plumbing connection ?	Dreame X40 Ultra: No	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No

Navigation and Intelligence

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Navigation system ?	Dreame X40 Ultra: 360° LiDAR turret	Roborock Qrevo Curv 2 Flow: 360° LiDAR turret	Xiaomi X20 Max: 360° LiDAR turret
Obstacle avoidance ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: Sí
AI camera Different ?	Dreame X40 Ultra: Yes, dual	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
Front 3D laser sensor ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: Sí
No. of recognised obstacles Different ?	Dreame X40 Ultra: 120	Roborock Qrevo Curv 2 Flow: 200	Xiaomi X20 Max: ?
Pet recognition Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
Cleaning behind curtains Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No
Remote camera access Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
Night vision LED ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: Sí
AI intelligent cleaning Different ?	Dreame X40 Ultra: Yes, CleanGenius 2.0	Roborock Qrevo Curv 2 Flow: Yes, SmartPlan 3.0	Xiaomi X20 Max: Sí
AI stain recognition Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
CPU / Algorithm Different ?	Dreame X40 Ultra: AI Sage 11.0 Quad-core	Roborock Qrevo Curv 2 Flow: ?	Xiaomi X20 Max: ?

Advanced Features

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Ability to overcome steps Different ?	Dreame X40 Ultra: 0.9 in (22 mm)	Roborock Qrevo Curv 2 Flow: 0.8 in (20 mm)	Xiaomi X20 Max: 0.8 in (20 mm)
Robotic arm ?	Dreame X40 Ultra: No	Roborock Qrevo Curv 2 Flow: No	Xiaomi X20 Max: No
Integrated own voice assistant Different ?	Dreame X40 Ultra: No	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: No
Compatible with voice assistants (Alexa, Google Home...) ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: Sí
Matter compatible Different ?	Dreame X40 Ultra: Sí	Roborock Qrevo Curv 2 Flow: Yes, via OTA update	Xiaomi X20 Max: No

Robot Tanks

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Robot dust bin Different ?	Dreame X40 Ultra: 300 ml	Roborock Qrevo Curv 2 Flow: 324 ml	Xiaomi X20 Max: ?
Robot water tank Different ?	Dreame X40 Ultra: 2.7 fl oz (80 ml)	Roborock Qrevo Curv 2 Flow: Sí	Xiaomi X20 Max: Sí

Robot Dimensions

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Robot diameter Different ?	Dreame X40 Ultra: 350 mm	Roborock Qrevo Curv 2 Flow: 353 mm	Xiaomi X20 Max: 350 mm
Robot height Different ?	Dreame X40 Ultra: 97 mm	Roborock Qrevo Curv 2 Flow: 119 mm	Xiaomi X20 Max: 97 mm

Base Dimensions

Dreame X40 Ultra

Roborock Qrevo Curv 2 Flow

Xiaomi X20 Max

Base width Different ?	Dreame X40 Ultra: 340 mm	Roborock Qrevo Curv 2 Flow: 450 mm	Xiaomi X20 Max: 340 mm
Base height Different ?	Dreame X40 Ultra: 590.5 mm	Roborock Qrevo Curv 2 Flow: 450 mm	Xiaomi X20 Max: 563 mm
Base depth Different ?	Dreame X40 Ultra: 456.7 mm	Roborock Qrevo Curv 2 Flow: 450 mm	Xiaomi X20 Max: 420 mm