This list is for anyone tired of misting glass by hand before each pass. A robot qualifies if the brand lists a built in spray system. Compare tank sizes, which run from 26 ml per tank to 120 ml here, since a small tank means more refills on big windows, and check how the spray is triggered. How we score.
Older corded Hobot with ultrasonic spray, now heavily discounted
SUCTION 6.0 kg suction force (brand spec via Adorama)SPRAY Ultrasonic auto spray, 40 ml replaceable tankBACKUP BATTERY Built in UPS holds about 20 min with an alert (brand spec)FRAMELESS Supported via laser edge sensor (brand spec)SCORE 9.0
Budget window robot with dual mist spray and strong framed results
Why it ranks here
Ranks first on solid scores plus the lowest price here. EFTM gave it 83% and home&smart 82/100, both for clean results on framed windows. It is corded with no corner scrubbers, and EFTM saw it slip on a frameless shower screen, so it is a framed window pick.
SUCTION 8,000 PaSPRAY Dual mist, 120 mlBACKUP BATTERY 30 min holdFRAMELESS Yes, less reliableSCORE 8.5
Last gen Ecovacs station model, now much cheaper than the W2S line
SUCTION 5,500 Pa max, 2,800 Pa while moving (brand claim)SPRAY Auto spray, 60 ml tankBACKUP BATTERY 4,500 mAh battery, 110 min runtime; stays attached over 30 min at low power (brand claim)FRAMELESS Supported, framed and framelessSCORE 8.2
Long running Hobot square robot with dual ultrasonic spray
Why it ranks here
Its one scored review, 8.5/10 from Appliance Retailer, is slightly above the N1's average, but it costs about $100 more and the review is dated. It sits above the W2S Pro Omni because it costs about $200 less, despite a lower test score. Its tanks are small at 26 ml each.
SUCTION 6.0 kg forceSPRAY Ultrasonic, 2 x 26 mlBACKUP BATTERY 20 minFRAMELESS Yes, edge sensorSCORE 7.7
Cheaper W2S with the same 8,000 Pa claim and TruEdge scrubber
SUCTION 8,000 Pa (brand claim)SPRAY Three nozzle spray; Ecovacs lists an 80 ml tankBACKUP BATTERY 3,000 mAh battery; stays attached over 30 min at low power (brand claim)FRAMELESS Supported, framed and frameless flat windowsSCORE 7.4
Newer cordless Winbot with a bigger tank, minus pad washing
Why it ranks here
Basic Tutorials scored it 92/100, the best single test score here, with navigation that needed no intervention. It ranks below the Hobot because it costs about $200 more. It beats the W3 Omni by costing about $200 less with a similar battery station, though you rinse the pad by hand.
SUCTION Up to 10,000 PaSPRAY 3 nozzle, 120 mlBACKUP BATTERY 110 min cordlessFRAMELESS Yes, optical sensorSCORE 7.0
Flagship window robot whose station washes the pad for you
Why it ranks here
CyberShack rated it 4.5/5 and found results better than hand cleaning, but it is the most expensive robot here, which puts it last among scored models. Its station washes the pad for you. Gizmodo saw streaks and missed areas on tapered frames, and reviewers noted a faint pad outline.
SUCTION 3,300 Pa movingSPRAY Auto, 80 mlBACKUP BATTERY 130 min cordlessFRAMELESS Reported by GizmodoSCORE 6.3
Small corded Winbot for narrow panes and tight budgets
SUCTION 7,500 Pa max, 3,200 Pa while moving (brand claim)SPRAY Ultrasonic spray, 4 nozzles, 60 ml tankBACKUP BATTERY Stays attached about 30 min after a power cut with an alarm (brand claim)FRAMELESS Ecovacs says supported; Galaxus says it could not clean frameless panesSCORE not yet
Small square window robot for narrow panes and apartments
Why it ranks here
A small corded Winbot for panes down to 25 x 25 cm, with corner brushes and a 50 ml tank. TechRadar's homes editor found it cleaned narrow windows and removed water marks. It is not ranked yet because that report gave no numeric score, so there is no test score to rank it on.
SUCTION 8,000 Pa maxSPRAY Ultrasonic, 50 mlBACKUP BATTERY 30 min holdFRAMELESS Yes, 3 mm+ glassSCORE not yet
W2S Pro Omni robot without the station, for less money
Why it ranks here
The W2S Pro Omni robot without the station, for about $160 less, with the same 10,000 Pa suction claim, 120 ml tank and corner scrubbers. Ecovacs does not publish its safety rope details. It is not ranked yet because we found no independent test results to score it on.
SUCTION Up to 10,000 PaSPRAY 3 nozzle, 120 mlBACKUP BATTERY 30 min holdFRAMELESS Yes, optical sensorSCORE not yet
Ecovacs window robot with a portable battery station for big glass
SUCTION 8,000 Pa max, 3,000 Pa while moving (brand claim)SPRAY Three nozzle spray, 80 ml tankBACKUP BATTERY 4,500 mAh battery, 110 min runtime; stays attached 30 min or more at low power (brand claim)FRAMELESS Supported, framed and frameless flat windowsSCORE not yet
Hobot robot that sprays, wipes, then scrapes glass dry
SUCTION 6,000 Pa static suction (brand claim)SPRAY Dual side nozzles with pressurized pump; 120 ml tank per RobotobzorBACKUP BATTERY Built in UPS holds 20 min with an audio alert (brand claim)FRAMELESS Supported, sensors detect frameless edges (brand claim)SCORE not yet