The best alternatives to Tertill are iRobot, SpinX, and The Wall Garden. If these 3 options don't work for you, we've listed a few more alternatives below.
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iRobot Corporation is an American advanced technology company founded in 1990 by three members of MIT's Artificial Intelligence Lab who designed robots for space exploration and military defense.
The Roomba® i7+ Robot Vacuum with Clean Base™ Automatic Dirt Disposal takes convenience to a new level — automatically emptying into an enclosed bag that holds 30 robot bins