Guides
8 shortlists, each saying what it ranks on
Nobody here is picking favourites and there is no test lab. Each list below is a filter and an order applied to the catalog, and it prints the rule at the top, so you can argue with the rule rather than with an opinion.
Automatic Litter Boxes for Two or More Cats, by Days Between Emptying
22 qualifying boxes
Ordered by days between emptying for two cats: drawer litres ÷ (2 × 0.7 L a day), then by price.
Self-Cleaning Litter Boxes Rated for Large Breeds
10 qualifying boxes
Every box rated by its maker for cats of 25 lb or more, ordered by that rating and then by price.
Automatic Litter Boxes That Detect the Smallest Cats
27 qualifying boxes
Every box with a published minimum detection weight, ordered by that weight and then by the maker's minimum age.
What Tray, Cartridge and Refill-Ring Litter Boxes Cost to Run
9 qualifying boxes
Every box that needs a proprietary consumable, ordered by monthly cost per cat at the maker's published price and usage; boxes whose maker publishes too little to work it out come last.
Self-Cleaning Litter Boxes That Take Tofu Litter
10 qualifying boxes
Every box whose maker lists tofu litter as compatible and requires no proprietary consumable, ordered by price.
Low-Step Automatic Litter Boxes for Older Cats
8 qualifying boxes
Every box with a published entry-step height under 8 inches, ordered from the lowest step.
Automatic Litter Boxes by Published Noise Rating
13 qualifying boxes
Every box with a published noise rating, ordered from the lowest figure. No maker states its measuring distance, so small gaps mean little.
Automatic Litter Boxes Under $300
14 qualifying boxes
Every box listed under $300 on its maker's own US store, ordered by price.
A list needs at least 3 qualifying boxes to exist at all; anything shorter is a comparison with a headline on it. How the catalog is built.