The purpose of this app to help you "encode" your favorite mathematical constants π, e and φ into color palette of your app/website/project. Simply touch a color wheel to pick a color, and see a letter for each constant change into its "complement" color. The "complement" color is calculated simply by dividing RGB value of a color by the value of a corresponding constant.
The source code for the app is available at https://github.com/izzytwosheds/PiColorWheel
Enjoy the app!