Independent rankings
Window robots with a stated power-cut backup, ranked on grip, backup minutes, the safety rope and fault detection, for glass above the ground floor.
On an upstairs window the only specification that matters is what the robot does in the minute after the mains fails. Only machines whose maker states how many minutes they hold on without power are listed, with the minutes on every row; a robot that names no backup time is left out, whatever else it promises. Weighted on suction, on how long it holds on without power, on the rope and its rating, and on whether it checks itself for a fault before it lets go.
10 / 17 models evaluated · Updated
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MOVA's light 8,000 Pa window robot: sprays from a 120 ml tank for 32 m², plans a Z or N route, talks you through the job in 15 languages and holds on for 30 minutes after a power cut.
Power-cut backup: 30 min
Highest on this list · Glass per fill: 75 m²
The 10,000 Pa Winbot with the biggest tank: TruEdge 2.0 cleaning flush to the frame, 120 ml for 75 m² a fill, four-stage noise reduction to 66 dB and a battery station for 110 minutes off the mains.
The slim Winbot for narrow panes from 25 × 25 cm: 8,000 Pa, felt brushes at all four corners, ultrasonic mist from a 50 ml tank for 30 m², WIN-SLAM 4.0 and 30 minutes of grip after a power cut.
The Winbot with a corner scrubber: 8,000 Pa, a TruEdge brush that drops into the corners at 200 rpm, an 80 ml tank for 50 m² and a 5.2 kg battery station for 110 minutes off the mains.
Ecovacs' 2026 flagship: 10,000 Pa, a TruEdge corner scrubber, six nozzles on an 80 ml tank for 50 m², 16 cm/s, and a 10 kg station that washes the pads itself and runs 130 minutes off the mains.
MOVA's first window robot with a base station: 10,000 Pa, panes to 2.5 × 8 m, rated for 90 m² of wet cleaning, an 80 ml tank with warm water, corner brushes, 80 minutes off the mains, 3-year warranty.
Mamibot's flagship with a squeegee: 8,000 Pa, a 215 ml tank for 35 m², four-side edge sensors, five modes, a 650 mAh backup for 25 minutes and a combined cable and rope, for glass, tiles or marble.
A 215 mm window robot for small and narrow panes from 22 × 25 cm: 7,500 Pa, ultrasonic misting from a 60 ml tank for 25 m², three modes, 1.3 kg and 30 minutes of grip after a power cut.
Ecovacs' corded entry-level Winbot: 5,300 Pa, six spray nozzles on a 60 ml tank for 40 m², seven modes on a planned WIN-SLAM route, an edge mode and 30 minutes of grip after a power cut.
HOBOT's squeegee robot: twin auto-lifting scrapers behind a pump-fed spray, 6,000 Pa, Edge-Leakage sensors for gaps under 5 mm, four modes, a 230 kgf rope and 20 minutes of power-cut backup.
Which window robots fit your glass, how they hold on when the power fails, what the rope and the backup battery are for, and which ranking to open next.