Litter-Robot is one of the best-known self-cleaning litter boxes. It rotates to separate waste into a drawer. It is expensive, but many owners say it saves time. Models have different features, so compare the current lineup.

Who it is for: owners who want a proven design and have the budget.

• Pros: well known, strong support, works with clumping litter.
• Cons: high price, and it is large.

Verdict: the benchmark many others compare against.

Based on specs and verified buyer reviews, not our own testing. Specs and prices change, so check the current listing on Amazon. As an Amazon Associate I earn from qualifying purchases.