geosign

Plant a signboard in the real world. Others see a coloured dot from afar, and the sign reveals itself when they stand where you stood.

  1. Hold your phone upright and face a direction.
  2. Pick how far ahead and how big the sign is. It stands on the ground, facing you.
  3. Write your message and drop it. Anyone within 500 m sees your dot; within 5 m they can read it.

Needs your location, motion sensors and camera. Only the sign's position and text are saved. Works best outdoors, away from metal.

Desktop simulator