Comparison

Dreame X40 Ultra vs Roborock Saros 20

Detailed Technical Comparison

Best value for money

1 / 8

Dreame X40 Ultra

7.5

Overall score

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Best Score

1 / 9

Roborock Saros 20

8.6

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 Saros 20

Overall score 8.6

Power and Battery 8.6

Brushing System 6.7

Mopping System 8.7

Cleaning Base 8.2

Navigation and Intelligence 8.2

Detailed Technical Comparison

Key features organised by category

General Information

Dreame X40 Ultra

Roborock Saros 20

Brand Different ?	Dreame X40 Ultra: Dreame	Roborock Saros 20: Roborock
Release date Different ?	Dreame X40 Ultra: 2024	Roborock Saros 20: February 2026

Power and Battery

Dreame X40 Ultra

Roborock Saros 20

Suction power Different ?	Dreame X40 Ultra: 12.000 Pa	Roborock Saros 20: 36.000 Pa
Battery capacity ?	Dreame X40 Ultra: 6.400 mAh	Roborock Saros 20: 6.400 mAh
Declared runtime Different ?	Dreame X40 Ultra: 194 min	Roborock Saros 20: —
Fast battery charging ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí

Brushing System

Dreame X40 Ultra

Roborock Saros 20

Main brush Different ?	Dreame X40 Ultra: Simple Silicone Brush	Roborock Saros 20: DuoDivide Anti-Tangle Hair Brush
Liftable main brush ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Liftable side brush ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Extendable side brush ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Anti-tangle side brush ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Skirting board brush ?	Dreame X40 Ultra: No	Roborock Saros 20: No

Mopping System

Dreame X40 Ultra

Roborock Saros 20

Mopping type Different ?	Dreame X40 Ultra: Two Rotating Mops 180 RPM	Roborock Saros 20: Two Rotating Mops 200 RPM 13N
Mop extension Different ?	Dreame X40 Ultra: Yes, with RoboSwing movement	Roborock Saros 20: Sí
Mop lifting Different ?	Dreame X40 Ultra: Yes, 0.4 in (10.5 mm)	Roborock Saros 20: Yes, 12-0.9 in (-22 mm)
Floor mopping temperature Different ?	Dreame X40 Ultra: Cold water	Roborock Saros 20: Warm Water
Remove mops at base ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Mop dirt detection ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Floor dirt detection ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí

Cleaning Base

Dreame X40 Ultra

Roborock Saros 20

Auto-emptying of dust bin ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Mop washing Different ?	Dreame X40 Ultra: Yes, with hot water at 158 °F (70°C)	Roborock Saros 20: Yes, with hot water at 212 °F (100°C)
Mop drying Different ?	Dreame X40 Ultra: Yes, with hot air at 113 °F (45°C)	Roborock Saros 20: Yes, with hot air at 131 °F (55°C)
Washing tray self-cleaning Different ?	Dreame X40 Ultra: Yes, 2nd generation	Roborock Saros 20: Yes, with hot water at 212 °F (100°C)
UV disinfection ?	Dreame X40 Ultra: No	Roborock Saros 20: No
Detergent tank ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Automatic mop changing ?	Dreame X40 Ultra: No	Roborock Saros 20: No
Dust bag capacity Different ?	Dreame X40 Ultra: 3.2 L	Roborock Saros 20: 2.5 L
Clean water tank Different ?	Dreame X40 Ultra: 4.5 L	Roborock Saros 20: 4 L
Dirty water tank Different ?	Dreame X40 Ultra: 4 L	Roborock Saros 20: 3 L
Plumbing connection kit Different ?	Dreame X40 Ultra: Yes (purchased separately)	Roborock Saros 20: No
Integrated plumbing connection ?	Dreame X40 Ultra: No	Roborock Saros 20: No

Navigation and Intelligence

Dreame X40 Ultra

Roborock Saros 20

Navigation system Different ?	Dreame X40 Ultra: 360° LiDAR turret	Roborock Saros 20: StarSight 2.0
Obstacle avoidance ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
AI camera ?	Dreame X40 Ultra: Yes, dual	Roborock Saros 20: Yes, dual
Front 3D laser sensor ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
No. of recognised obstacles Different ?	Dreame X40 Ultra: 120	Roborock Saros 20: 300
Pet recognition ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Cleaning behind curtains ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Remote camera access ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Night vision LED ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
AI intelligent cleaning Different ?	Dreame X40 Ultra: Yes, CleanGenius 2.0	Roborock Saros 20: Yes, SmartPlan 3.0
AI stain recognition ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
CPU / Algorithm Different ?	Dreame X40 Ultra: AI Sage 11.0 Quad-core	Roborock Saros 20: ?

Advanced Features

Dreame X40 Ultra

Roborock Saros 20

Ability to overcome steps Different ?	Dreame X40 Ultra: 0.9 in (22 mm)	Roborock Saros 20: Single step 1.8 in (45 mm) - Double step 88 mm
Robotic arm ?	Dreame X40 Ultra: No	Roborock Saros 20: No
Integrated own voice assistant Different ?	Dreame X40 Ultra: No	Roborock Saros 20: Sí
Compatible with voice assistants (Alexa, Google Home...) ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí
Matter compatible ?	Dreame X40 Ultra: Sí	Roborock Saros 20: Sí

Robot Tanks

Dreame X40 Ultra

Roborock Saros 20

Robot dust bin Different ?	Dreame X40 Ultra: 300 ml	Roborock Saros 20: 270 ml
Robot water tank Different ?	Dreame X40 Ultra: 2.7 fl oz (80 ml)	Roborock Saros 20: 2.3 fl oz (69 ml)

Robot Dimensions

Dreame X40 Ultra

Roborock Saros 20

Robot diameter Different ?	Dreame X40 Ultra: 350 mm	Roborock Saros 20: 353 mm
Robot height Different ?	Dreame X40 Ultra: 97 mm	Roborock Saros 20: 79.8 mm

Base Dimensions

Dreame X40 Ultra

Roborock Saros 20

Base width Different ?	Dreame X40 Ultra: 340 mm	Roborock Saros 20: 381 mm
Base height Different ?	Dreame X40 Ultra: 590.5 mm	Roborock Saros 20: 488 mm
Base depth Different ?	Dreame X40 Ultra: 456.7 mm	Roborock Saros 20: 475 mm