Best Robot Window Cleaners: 8 Models Ranked

How The Bot Scout Ranked These Robot Window Cleaners

A robot window cleaner is a small crawler that clings to glass with a suction fan and drags a microfiber pad across the surface. The category is dominated by three vendors — Hobot Technology, ECOVACS Winbot, and Mamibot — with a long tail of rebadged units such as the Alfawise WIN660 that surface on marketplaces.

The Bot Scout ranks these units on four things the marketing rarely leads with: measured suction (how many pascals the fan pulls and whether there is a battery-backed backup), safety leash (whether a real tether ships in the box and how it attaches), glass compatibility (framed vs frameless, and the minimum pane size the unit can path on), and area coverage (advertised time per square meter versus the pad-refresh cycle).

Prices below are the confirmed manufacturer or major-retailer list price at time of review. Where a unit is only sold through quote or third-party marketplaces, that is called out explicitly. The U.S. Consumer Product Safety Commission has not issued a robot-window-cleaner-specific standard, so leash quality is judged against the vendor spec sheet, not a common certification.

1. Hobot 388 Ultrasonic Spray — Best Overall

The Hobot 388 is the model that most consistently pairs a real ultrasonic water sprayer with a leash that is long enough to work upper-story windows. Hobot lists the 388 at $499 on the Hobot product page, with a 2,800 Pa suction fan, a 4.5 m nylon tether with steel carabiner, and a battery backup that keeps the unit clinging for roughly 20 minutes after a power loss.

Ultrasonic spraying matters because it lays down water without the pooling that a squirt nozzle causes on a vertical pane, which is what smears when the pad rotates over it. The 388 clears a framed pane in roughly three minutes on the N-path routine, per Hobot's own product literature.

The trade-off is noise and pad management. The ultrasonic head is loud enough to notice through a closed door, and the microfiber pad needs a rinse or swap every two windows to avoid smearing. It is the right pick if you have a lot of glass, less right if you have two small windows a month.

2. ECOVACS Winbot W2 Omni — Best Suction and Coverage

The Winbot W2 Omni pushes suction to a claimed 5,500 Pa, the highest of any unit in this roundup, and ships with a portable base station that acts as the power tether and the safety pod. The ECOVACS US product page lists it at $599 with a 3 m tether from the safety pod to the robot.

The Omni is the best pick for large picture windows and sliding-door glass, where the extra suction offsets the greater weight of the unit and the base station shortens the corded reach problem that plagues earlier Winbots. ECOVACS advertises coverage of a standard framed pane in roughly 2.5 minutes.

The catch is that the safety pod adds a second device to place, and the 3 m pod-to-robot tether is shorter than the Hobot 4.5 m leash if you are working from a balcony above the window.

3–5. Hobot 2S, Winbot W1 Pro, and Mamibot W120-T

The Hobot 2S at $369 on the Hobot 2S page is the value pick when frameless glass is not in the plan. It shares the 388's fan and leash but drops the ultrasonic sprayer, so you spray a microfiber pad by hand before mounting it.

The Winbot W1 Pro at $399 on the ECOVACS W1 Pro page is the entry-level Winbot with the safety pod system. It is the right pick if you want the ECOVACS pathing logic without the W2 Omni price.

The Mamibot W120-T at $299 on the Mamibot product page is the cheapest unit that quotes 3,800 Pa suction and ships a 4 m safety rope. Mamibot is the smallest of the three primary vendors and support responsiveness is the honest weak point, per buyer comments on the product page itself.

• Pick the Hobot 2S if all your glass is framed and you already own a spray bottle.
• Pick the Winbot W1 Pro if you want the ECOVACS safety pod without the W2 price.
• Pick the Mamibot W120-T if the budget is tight and you accept the smaller vendor.
• In all three cases, confirm the pane is at least 60 cm on the shortest side before ordering.

6–8. Alfawise WIN660, Hobot 298, Mamibot iGLASSBOT W110

The Alfawise WIN660 is a marketplace unit rather than a first-party-supported product. It appears on eBay and third-party listings around $180, with a vendor-claimed 3,000 Pa suction and a bundled tether. Ranked sixth because the manufacturer support channel is thin and firmware updates are not published on a maintained page.

The Hobot 298 Ultrasonic at $399 on the Hobot 298 page is the older sibling of the 388. It keeps the ultrasonic sprayer and 4.5 m leash but uses an earlier pathing algorithm. Buy it only if it is discounted meaningfully below the 388.

The Mamibot iGLASSBOT W110 at $249 on the Mamibot W110 page is the entry unit. It is framed-glass only and lacks the wider suction fan of the W120-T. It is the right pick only when the total glass area is small enough that a squeegee would arguably do the job.

Suction Anchor, Safety Leash, and Glass Compatibility

The single failure mode that matters is fall. Every unit in this roundup uses a suction fan to anchor to the glass and a physical leash as the backup. When the fan loses seal — usually because the pad hit a frame edge or a decal — the leash is what keeps the unit off the floor or the person below.

Read the leash spec, not the marketing copy. The Hobot 4.5 m nylon tether with a steel carabiner is longer and more clearly rated than the ECOVACS 3 m pod tether, which is in turn better documented than the generic ropes shipped with marketplace units. OSHA guidance on tethering does not cover consumer robots, but the same principle applies: the anchor point matters as much as the rope.

Glass compatibility is a second gate. Framed panes let the robot use the frame as a boundary for pathing. Frameless panes — shower doors, some sliding balcony doors — require a unit with edge-detection sensors, and only the Hobot 388, Hobot 298, Winbot W2 Omni, Winbot W1 Pro, and Mamibot W120-T are rated by their manufacturers for frameless glass.