Best robot vacuums under $400

Top pick: Roborock Q10 S5+ — the best balance under $400. It vacuums and mops, empties itself into a dock, works with Alexa and Google, and has the strongest owner ratings of the group (4.4 from 1,100+). For most homes it's the one to get.

Who the others suit:

• Roborock Q7 L5 — if you want a proven, well-rated Roborock for as little as possible and don't mind emptying the bin yourself.
• iRobot Roomba 105 Combo — if you'd rather stay in the Roomba ecosystem (Siri, Alexa, Google) and want a mop plus a self-empty dock.
• ILIFE A30s — if you have pets or big carpeted rooms and want long runtime and strong suction on a tight budget.
• GOOVI — if you want a self-emptying station and mopping on a budget, and can live with fewer reviews.
• Shark Matrix RV2310AE — if you want a self-emptying Shark; a refurbished unit is the cheaper route.

Skip the Dreame GoVac 400 here — it's over the limit.