a browser version of a vestaboard — those mechanical split-flap displays from train stations and design-y lobbies. type a message and watch it flutter into place one character at a time, with the mechanical clatter if you leave the sound on.
compose with color chips, swap between board sizes, and control alignment down to the block. message history and your theme persist locally. a real vestaboard runs about three grand; this one's free and lives in a tab.