Many of the suspiciously inexpensive robot vacuums cut corners too close to the sun, quickly shifting from helpers around the house to agents of chaos. The more basic the navigation tech under the hood, the more likely you are to come home to a vacuum stuck under the couch (rather than a fully swept home).
Most cheap robot vacuums don't have the suction power or brush roll system necessary to pry crumbs or pet hair out of any carpet pile. That mediocrity extends to many robot vacuum and mop combo models, which don't "scrub" so much as feebly drag a damp cloth across the floor. At that point, it'd be less of a bother to get a decent stick vacuum and do it yourself.
Long story short: Buying a robot vacuum just because it's cheap puts that glorious hands-off cleaning experience in jeopardy. But not all cheap robot vacuums are crappy, even compared to a few years ago. Smart mapping and self-emptying docks are super easy to find for just a few hundred dollars, and more premium features like small obstacle avoidance and automatic mop washing and drying can often be found below $500.
Recent changes to this guide
March 2026: I added the Eufy C28 as the best budget roller mop robot vacuum. (It's also the only "budget" roller mop robot vacuum out there right now.) I consider this a replacement for the Eufy X10 Pro Omni, which was the best budget self-washing and drying station for much of 2025.
July 2025: I replaced the Roomba 205 DustCompactor with the 3i G10+. The G10+ has significantly stronger suction and better mapping than the Roomba, plus more advanced features like small obstacle and pet waste avoidance and a livestream pet camera.
