Written only where the evidence supports one

Guides

PURRINDEX publishes a guide when the underlying data says something a buyer cannot easily find elsewhere. There is one. There is no schedule to fill.

What a budget automatic litter box does not tell youFifteen of sixteen budget records in this index carry no manufacturer litter guidance, no entry dimensions and no documented sensing mechanism.
Answer a requirement, not a topic

Shortlists

Where the question is "which products qualify?", PURRINDEX answers with a filtered list and the documented criterion behind it — not with an essay.

Automatic litter boxes that support tofu litterTofu is the most commonly excluded litter type in this category. This is the list of products whose manufacturer explicitly states it is supported.Automatic litter boxes that support clumping clayThe best-documented litter axis in the category, with the conditions each manufacturer attaches.Boxes stated for large catsProducts carrying a published maximum cat weight of 25 lb or more.Open-top automatic litter boxesProducts whose documented mechanism is an open design rather than an enclosed chamber.Litter-Robot alternatives, by what they documentNon-Whisker products that publish the things Litter-Robot buyers compare on.Automatic litter boxes under $250The band where most units sell — and where manufacturers publish least.