The Best Cheap Robot Vacuums Under $100

Under $100, buy the Lefant M210. Its brushless suction port has nothing for hair to wrap around, its 2.99-inch body clears most sofas, and it runs for up to 120 minutes. It has no map and it never will - so buy it for a small hard-floor home, and buy something else for anything larger.

This is the price band where being honest matters most, because it is where the category's reputation is made and lost. A sub-$100 robot vacuum in a 500-square-foot flat with wooden floors is a genuinely good purchase. The same machine in a 1,500-square-foot house with carpet is the reason somebody tells their friends robot vacuums do not work.

#	Product	Best for	Score	Price
01	Lefant M210A brushless suction port instead of a roller brush, which is why it handles hair better than machines twice its price. It has no map and never will.	Best under $100	6.1out of 10	$89.98 - View on Amazon $199.9955% off #ad Price last verified September 2, 2026. How we are funded
02	Tikom G8000 MaxThe cheapest machine here that vacuums and mops in the same pass, with a published 5,000Pa behind it. Navigation is the compromise.	Best mop combo under $150	6.0out of 10	$108.21 - View on Amazon $149.9928% off #ad Price last verified September 2, 2026. How we are funded
03	Lefant M310The M210's brushless inlet plus nine position-sensitive sensors, so it stops before it shunts furniture instead of after. Still no map.	Best obstacle avoidance under $150	6.8out of 10	$109.99 - View on Amazon 2% off #ad Price last verified September 2, 2026. How we are funded

Scores come from the published rubric on How We Pick: suction 25%, navigation 25%, pet hair 20%, running cost 20%, setup 10%. They are editorial judgments about published specifications, not test results.

Daily maintenance on hard floors, unattended, without you thinking about it. That is not a small thing. The dust, hair and crumbs that accumulate on a wooden or tiled floor are exactly the debris that sits on the surface and lifts easily, and a machine running every day keeps a floor in a state a weekly vacuum never quite achieves.

It will also go under furniture you would not otherwise vacuum. At 2.99 inches the M210 clears most sofa and bed frames, and the strip of floor under a bed is usually the dustiest in the house precisely because nothing ever goes there.

• Cover a large floor plan reliably. With no map, the machine runs a pattern until the battery dies. Past roughly 800 square feet the coverage becomes genuinely patchy and there is no way to know which parts it missed.
• Clean carpet. A brushless inlet cannot agitate pile, and Lefant's own listing tells you not to use zigzag mode on carpet at all. Low-pile rugs get skimmed; anything deeper is untouched.
• Accept no-go zones. No map means nothing to draw on. If you need it to stay away from a pet bowl, you put a physical barrier there.
• Resume after charging. It goes back to the dock when the battery is low and starts a fresh pattern next time, rather than picking up where it stopped.
• Publish a suction figure. Lefant states no Pa rating for the M210 at all, which for a machine sold on suction is a strange omission and one we score as unverified.

If any of these describe your home, spend more or spend nothing: more than about 800 square feet of open floor; medium or high-pile carpet you want cleaned rather than skimmed; a cluttered floor with cables and toys, since a machine with no map and no obstacle avoidance will find every one of them; or a genuine expectation of mopping.

In those cases the $50 step up to under $150 buys a map, and the map is what the machine actually needs. Buying at this price and being disappointed is worse than not buying, because it usually ends the experiment for good.