When my kids were young we'd flip restaurant menus over and fill a hand-drawn grid with crayon doodles, one square at a time. I wanted to turn that ritual into an app.

Patchwork lets you create an NxN grid, share an invite link, and have collaborators claim and fill squares with images asynchronously.

Squares are visible as they're filled: the quilt builds up slowly over hours or days, and checking back to see what someone added is the whole point.