A two-level window perch that folds away when the sun goes down. You press the suction cups to the glass, two cats settle onto their own sunny level, and at night the frame folds up so your blinds close, all with no tools required.
Most window perches hold one cat, so the second one waits its turn or watches from the floor. Sunstack stacks two perches on the glass so two cats can take in the yard at once, and it folds up at night so your curtains and blinds still close.

A double-stack frame gives each cat its own perch at the window, on a 12 x 23 inch footprint that keeps your floor space free.
The cups press onto clean, dry glass and hold the frame in place, with no tools required for mounting.
Fold the frame up against the window and your curtains or blinds close without taking the perch down.
Two faux fleece covers lift off the metal frame and go in the washing machine when fur and paw prints build up.
Putting a perch on a window raises a few reasonable questions. Will the suction cups hold, is there really room for two cats, and will you lose your curtains to it? Here’s how each one is handled.
The suction cups need a clean, dry window to grip. Cleaning the glass and the cups about once a month helps keep the hold secure.