
After months of side-by-side testing across CNN Underscored, Catster, and Cats.com, the Whisker Litter-Robot 4 remains the automatic litter box to beat. Its QuietSift cycle, sealed waste drawer, and Whisker-app health tracking outperform every other smart unit reviewers tested, even though the $699 price tag and tight interior keep it from being a universal pick.
- — Whisker app tracks weight, visit frequency, and waste level in real time
- — QuietSift cleaning cycle is noticeably quieter than the Litter-Robot 3 and PuraMax 2
- — $699 sticker is the highest in this round-up by a wide margin
- — Interior chamber is still tight for cats over about 17 pounds



