PETKIT PuraMax 2 Self-Cleaning Litter Box vs Whisker Litter-Robot 4 Automatic Litter Box

Both are self-cleaning, app-connected boxes with weight-based cat tracking, and both rate 4.5 stars. The PuraMax 2 is the better pick for most homes: a larger drum, a 7L waste bin, a low 7.9-inch entry, and a zero-pinch open entrance that suits senior cats and multi-cat households. The Litter-Robot EVO is the smaller, more compact option built for one to two cats and tight spaces, backed by Whisker's established Litter-Robot line. Owners of both report reliable cycling and useful app data; the PuraMax 2's open entry is the safer design for skittish or older cats.

• Choose the PetKit PuraMax 2 if you have multiple cats, a senior cat, or want the lowest entry and the largest waste capacity.
• Choose the Whisker Litter-Robot EVO if you have one or two cats, limited floor space, and want the compact model from the original Litter-Robot maker.