Overview
Finding the best window cleaning robot is harder than it looks, because glass sizes, frames and corners vary a lot from home to home. A robot that suits a large patio door may be too big for a bathroom window, and one that skips corners can leave you cleaning by hand anyway. This comparison looks at five models using three criteria: how close each one gets to edges and corners, how it applies water or cleaner, and how well its size and setup match typical windows. Specs come from maker and retailer listings, and where sources disagree we say so.
| Product | Rating | Best For | |
|---|---|---|---|
| ECOVACS WINBOT Mini Window Cleaning Robot (2026 Version) | ★ 4.1/5 (249) | Small windows and apartments | View → |
| ECOVACS WINBOT W2S Window Cleaning Robot with TruEdge | ★ 4.2/5 (242) | Standard to large windows | View → |
| HOBOT-2S Window Cleaning Robot with Ultrasonic Water Spray | ★ 3.7/5 (63) | Ordinary framed windows with spray | View → |
| Mamibot W120-DP Window Cleaning Robot 4 Spray Nozzles | ★ 3.9/5 (70) | App control on plain windows | View → |
| HOBOT-298 Window Cleaning Robot with Ultrasonic Water Spray | ★ 3.2/5 (191) | Budget ultrasonic spray buyers | View → |
The W2S has the clearest published support for framed and frameless windows plus dedicated edge cleaning, which covers the most common complaint about window robots, missed edges.
Check Price on Amazon →ECOVACS WINBOT Mini Window Cleaning Robot (2026 Version)
This is the compact model in the Ecovacs lineup, listed at 215 by 215 by 55 millimeters and about 1.3 kilograms. The maker describes ultrasonic spray and edge cleaning, and listings for the original Mini give a minimum window size of about 22 by 25 centimeters. That makes it a fit for small panes, bathroom windows and tight spaces where a larger robot will not sit well, and for apartment owners with modest glass areas. The trade-offs are that retailer listings disagree on figures such as suction, tank size and minimum window size, so check the exact 2026 version before buying, and that a small body covers less glass per pass than the larger W2S on big panes.
ECOVACS WINBOT W2S Window Cleaning Robot with TruEdge
The WINBOT W2S is the larger Ecovacs model in this group, listed at 271 by 271 by 77.5 millimeters and about 1.95 kilograms. Ecovacs lists support for framed and frameless windows, three-nozzle spray, a ten-level safety system and an edge sensor alongside its TruEdge edge cleaning. Minimum glass thickness is listed as 3 millimeters and minimum window size as 30 by 40 centimeters, so it will not suit very small panes the way the Mini does. It suits owners of standard to large windows and glass doors who care about reaching edges. The trade-offs are the bigger body, the higher minimum window size, and edge precision claims that vary between regional pages, so treat exact millimeter figures with caution.
HOBOT-2S Window Cleaning Robot with Ultrasonic Water Spray
The HOBOT-2S is built around dual ultrasonic spray nozzles, with edge-leakage sensors and voice prompts according to the maker. Listings give suction of about 6.0 kg and a noise level of 62 to 64 decibels, and one retailer lists up to 20 minutes of cleaning time on battery or mains power. Listings also mention a safety rope of about 4.5 meters, though stated rope ratings differ between sources. It suits buyers who want a spray-equipped cleaner for ordinary framed windows and are comfortable with a tethered setup. The trade-offs are that published specs conflict on noise, that it is an older design than the two Ecovacs models, and that most detail comes from third-party listings rather than a single spec sheet.
Mamibot W120-DP Window Cleaning Robot 4 Spray Nozzles
The W120-DP is a Mamibot model with four spray nozzles, an internal backup battery and control by remote or smartphone app, according to its manual. The manual describes Z-type, N-type and spot-cleaning paths and states that the robot does not clean window corners, so corners and edges need a quick hand finish. Listings give about 25 minutes of operating time and a 60 milliliter tank, and suction figures differ between sources, so none is quoted here. It suits buyers who want spray and app control on ordinary windows and accept that corners remain. The trade-offs are the uncleaned corners and the fact that many pages mix the DP up with sibling W120 models, so confirm you are reading DP details.
HOBOT-298 Window Cleaning Robot with Ultrasonic Water Spray
The HOBOT-298 is the earlier Hobot model here, a 2019 CES Innovation Award winner that uses automatic ultrasonic spray. Its listed size is about 9.45 by 9.45 by 3.94 inches and its weight about 2.8 pounds, close to the 2S. Listings describe it as suited to glass of any thickness. It suits buyers who find one at a sensible price and want the ultrasonic spray approach on standard windows. The trade-offs are that one retailer page says it is no longer available, published detail on noise, battery and cleaning speed is thin, and it predates the 2S, whose dual spray nozzles and edge-leakage sensors are highlighted by the maker, so newer designs may offer more.
Conclusion
Choose the Mini over the others when your windows are small or space is tight. It is the most compact here, while the W2S needs larger panes and the Hobot and Mamibot models are bulkier and have no edge-cleaning claims comparable to Ecovacs. Read More →
Choose the W2S over the Mini when your glass is larger or frameless and edge coverage matters most. Compared with the Hobot and Mamibot models it has the clearest published support for frame and frameless windows, but it needs a bigger minimum window. Read More →
Choose the HOBOT-2S over the 298 if you want dual ultrasonic spray nozzles and edge-leakage sensors from the same maker. Against the Ecovacs models it is an older design with less consistent published specs, so it suits framed windows and tethered use. Read More →
Choose the Mamibot W120-DP over the Hobot models if app or remote control and four spray nozzles appeal to you. Its manual says it does not clean corners, so the Ecovacs models are the better choice when corners matter. Read More →
Choose the HOBOT-298 over the others only if you find it at a price you like and want ultrasonic spray on standard glass. The 2S and both Ecovacs models offer more detailed or newer specs, and one retailer lists the 298 as unavailable. Read More →
Frequently Asked Questions
What is the difference between the two Ecovacs models here? +
The Mini is the compact one, listed at 215 by 215 by 55 millimeters and about 1.3 kilograms. The W2S is larger at 271 by 271 by 77.5 millimeters and about 1.95 kilograms, with a listed 30 by 40 centimeter minimum window size. Pick the Mini for small panes and the W2S for larger glass.
How do the HOBOT-2S and HOBOT-298 differ? +
Both use ultrasonic spray and are close in size and weight. The 2S is the newer model, and the maker highlights dual spray nozzles, edge-leakage sensors and voice prompts. The 298 is the earlier 2019 design, and one retailer page lists it as no longer available.
Do window cleaning robots clean corners and edges? +
It varies by model. Ecovacs lists edge cleaning for the Mini and TruEdge for the W2S, while the Mamibot W120-DP manual says it does not clean window corners. Check each listing, and expect to wipe stubborn corners by hand with any robot.
Do these robots work on frameless windows? +
Ecovacs lists frame and frameless window support for the W2S, using an edge sensor to detect the glass boundary. For the other models, frameless support is not clearly confirmed in the sources we reviewed, so check the manual before using one on frameless glass.
Why do spec numbers differ between listings? +
Retailers often copy figures for sibling or older models, or round them differently. Suction, tank size and noise levels vary between sources for several robots here, so confirm details on the maker's own page for the exact model and version before you buy.