Where people use it
Concerts and fan events, to hold a name or a message up to the stage. Arrivals halls, as a pickup sign that can be read across the crowd. Birthdays, sports games, a shop window, a car's rear window when parked, or a quiet hello across a noisy room. A phone at full brightness is readable from a few metres; a tablet or a TV from much further.
Short messages work best: a name or a few words.
Short messages work best: a name or a few words. Use Chunky dots so each letter is taller, turn the device brightness all the way up, and pick red, amber or green, which hold their colour best at a distance. White and cyan look brighter up close but can bloom on a camera. Slow the speed down if people only catch the sign for a moment.
Sharing a sign
Copy link puts your message, colour, speed and direction into the page address. Send it to a friend and their phone opens the same sign, so a group can hold up matching banners. The text lives in the link only; this page stores nothing.