Everyone loves seeing rainbows, but it is hard to know when is a good time to look for one. This app will tell you what is the chance of seeing a rainbow right now. It will also regularly check and notify you when there is a good chance of seeing a rainbow, to increase your chances of seeing one. If there is a good chance of seeing a rainbow, the app will also tell you which way you should look.
This is the free, ad-supported version. If you like the app, please consider buying the paid (ad-free) version.