Popur
Popur splits the box in two: an open 20.5-by-14.2-inch tray where the cat goes, and a separate bin beside it that the tray tips waste into. mmWave radar and weight sensors watch the tray, and the sifter design is sold as pinch-free. The bin claim is the boldest in the catalog, 35 days for one cat from 11 litres, which is more than twice this site's arithmetic.
Approx. price
~$640
maker's store, not a live price
Best for: Cats that want a flat open tray, in homes with room for a long unit
Popur publishes neither the lightest cat this box detects nor a minimum age. Until it does, treat it as unsuitable for automatic cleaning around a kitten and run it by hand.
Detection: weight, infrared / radar. The maker states anti-pinch protection on the moving part, by sensor or by design.
How minimum weights work, and what to do below them11 L ÷ (cats × 0.7 L a day). The maker claims up to 35 days for one cat, which is more generous than this arithmetic supports. Where 0.7 L comes from.
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 Popur S7 Split Litter System yet. This section stays empty until there is something real to put in it.
Open-top
Best for: Large or hood-shy cats in a home that uses clay clumping litter
Open-top
Best for: Cats that avoid enclosed boxes, in a home that wants a big drawer
Open-top
Best for: Large-breed households that want an open box