Carton Rouge app for iPhone and iPad

This app allows the user to display a text in front of a blinking colored background while playing a horn sound to alert the surroundings.
You can edit, recolor, and resize the text and choose the color of the background. You can also choose a different sound to play once (about 1min) or indefinitely.
Touching in the center of the display opens up the properties dialog. Touching anywhere else stops and restarts the sound.
Use it, e.g., to draw attention to you, to call out wrong behavior in class, or to alert to danger.