This list is for owners who want streak free glass without paying for a station model. A robot qualifies if its price was under $300 when we last checked. These models are corded, so check that an outlet sits close to the window, how long the backup battery holds on if power drops, and the smallest pane each one fits. 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
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
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