PetSafe
This is the app-connected member of the crystal-tray family, sold open or with a front-entry hood that brings it to 15.6 inches. The My PetSafe app logs visits and reminds you when a tray is due. PetSafe's page gives no tray-life figure for this model, so the site does not compute a monthly cost for it even though it uses the same trays.
Approx. price
~$270
maker's store, not a live price
Best for: Owners who travel and want a visit log from a crystal-tray box
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 themThe maker publishes no drawer volume, so the days cannot be worked out.
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 Smart 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: A single cat in a small home where no drawer ever gets emptied
Crystal tray
Best for: A tight budget, one cat, and no interest in an app