Comparison Dreame D9 Max vs Dreame F9

The cleaning method determines whether the robot can only collect dry debris or also wipe the floor covering with water, as well as which methods are available for this.

— Dry. The robot cleans the floor with brushes and airflow, directing dust, crumbs, hair and pet fur into the dust container. This option is suitable for carpets and hard floors, but does not remove stains and marks from the floor.

— Dry and wet. The device combines debris suction with wiping the floor using a damp attachment. Depending on the design, this can be a simple cloth or an active washing module that handles fresh stains and shoe marks more effectively.

— Side brushes. Small rotating elements that sweep debris along walls, near furniture and from corners towards the main suction opening. One side brush on the edge of the body sweeps debris along walls, near furniture and from corners into the central suction channel. This design is usually sufficient, since the robot most often moves along obstacles with one particular side. Two brushes work on both sides of the body and cover a wider strip of floor in one pass. This setup is especially convenient when moving along walls and between furniture, although on smooth floors fast brushes can sometimes scatter light debris.

— Extendable brush. A movable side brush automatically extends beyond the body when cleaning corners and areas near walls. Compared with a regular fixed design, it reduces uncleaned areas where the robot body cannot get close enough.

— Turbo brush.... A motorized module on the bottom of the robot that picks up debris and directs it into the suction channel. The working part may consist of a roller with bristles, rubber blades or a combined coating. This system collects pet fur, hair and dirt from carpets more effectively than a simple suction opening, but bristled elements need regular cleaning to remove tangled hair.

— Floor scrubber. An active washing module with rotating mops or a roller that does not simply glide over the floor, but mechanically scrubs away dirt. This system removes stains and marks better than a regular cloth.

— Extendable floor scrubber. One of the rotating mops shifts to the side and extends beyond the robot body. This allows the floor to be wiped closer to skirting boards, furniture legs and corners, where a regular fixed floor scrubber leaves a narrow dry strip.

— Vibration wiping. The washing platform rapidly moves the cloth back and forth, increasing friction against the surface. In terms of effectiveness, this option falls between a passive cloth and rotating mops, removing light stains and marks well.

— Cloth wiping. A damp fabric attachment is fixed under the body and pulled across the floor while the robot moves. This simple solution is suitable for regularly removing fine dust and fresh marks, but hardly scrubs off dried-on dirt.

Measured in Pa, this indicator describes the robot vacuum cleaner's suction pressure: the higher it is, the easier it is for the device to pick up heavy debris and clean carpet pile. Values around 2,000–4,000 Pa are usually sufficient for regular cleaning of smooth floors, while 6,000–10,000 Pa and above are better suited for collecting hair, sand, and dirt from carpets or floor joints.

The dustbin capacity indicates how much dry debris fits in the robot vacuum’s built-in container before it needs to be emptied. Models with a 200–300 ml capacity are suitable for a small apartment and frequent cleaning cycles, while a 400–600 ml capacity is more convenient for larger areas, pets, or lots of hair. For robots with a self-emptying station, the size of the internal container is less important, as debris is automatically transferred to the docking station’s collection bin.

The tank capacity determines the water supply for moistening the pad, rotating mops, or cleaning roller. Compact tanks of around 200 ml are suitable for regular wiping of small areas, while 300–500 ml tanks allow fewer interruptions for refilling during cleaning.

Map building allows the robot vacuum to remember the layout of the room, track covered areas, and plan a consistent cleaning route. The method used to create the map affects its accuracy, orientation speed, and the device’s ability to detect obstacles.

— With sensors. The robot creates an approximate map based on data from the gyroscope, motion sensors, wheels, and collisions with obstacles. This system is more affordable, but determines the exact position of walls and furniture less accurately, and accumulated errors may lead to repeated passes or missed areas.

— With a rangefinder. A laser rangefinder, or LiDAR, measures the distance to surrounding objects and creates an accurate map of the room before completing a full pass around it. It works reliably in low light, confidently detects walls and furniture, and supports room division and no-go zones.

— With a camera. The camera analyzes the surroundings and navigates using visual objects, helping refine the robot’s position and the room layout. Its advantage is the ability to distinguish individual objects, although performance depends more heavily on lighting.

— With a rangefinder and camera. The combined system uses LiDAR for accurate distance measurement and map building, and a camera to detect small objects on the floor. Such a robot not only navigates rooms confidently in any lighting, but also avoids cable...s, shoes, toys, and pet bowls more effectively.

Voice assistant lets you control the robot vacuum with short commands through a compatible smart speaker, smartphone, or smart home system. You can use voice commands to start and stop cleaning, return the device to the docking station, and on some models select a room or operating mode. This feature is especially convenient when your phone is not within reach, but the set of available commands depends on the robot model and supported platform.

The cleaning area refers to the approximate room size the robot can cover on a single battery charge. In Eco mode, the device will cover more space than at maximum suction power or during intensive floor mopping. The value stated by the manufacturer is usually calculated for a relatively uncluttered room and may be lower in real conditions.

Threshold climbing indicates the maximum height of an obstacle that the robot vacuum can climb over on its own. A 15 mm level is usually sufficient for small floor covering joints, while 20 mm is better suited for standard interior door thresholds and carpets with a noticeable edge.

The dB rating helps assess how noticeable the robot vacuum will be during cleaning. A level of 55–60 dB is typical of quiet robots, 60–70 dB is considered standard, and values above 70 dB are typical of the most powerful modes. The lower the rating, the less the device interferes with conversations, rest, or work.