PetSafe
The current open-tray ScoopFree adds a light that tells you when the crystal tray is spent. Everything turns on that tray: its guide says 20 to 30 days for one cat, 10 to 15 for two and 7 to 10 for three or more, and at $23.33 a tray from a 6-pack the tray is the running cost. There is no drawer to empty and no bag.
Approx. price
~$200
maker's store, not a live price
Best for: A single cat in a small home where no drawer ever gets emptied
PetSafe publishes no detection weight, only a minimum age of 6 months. Run it by hand before then. Below the threshold, a kitten may not register at all, and the box could start a cycle with it inside.
Detection: sensor type not published. The maker does not state any anti-pinch protection.
How minimum weights work, and what to do below themNo drawer: the disposable tray is the unit you replace. The maker rates a tray for up to 30 days with one cat.
The two lists above are drawn from the maker’s own pages, manuals and prices, not from owner reports. Where owner discussion has been read it appears in its own section below, so the two are never mistaken for each other.
No owner discussion has been read for the PetSafe ScoopFree Crystal Plus yet. This section stays empty until there is something real to put in it.
Crystal tray
Best for: Cats that want a covered box, with an owner who likes a visit log without an app
Crystal tray
Best for: Owners who travel and want a visit log from a crystal-tray box
Crystal tray
Best for: A tight budget, one cat, and no interest in an app