An app released in the beginning of January to help find your missing Airpods using their bluetooth signals. The app gave users an idea of how to find their Airpods with the use of simple tutorial screens and a simple bluetooth range guage.
The app was pulled a few days later, and now that the heat of the media has settled the project is now open-source.
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Some links on more information about the app.
https://www.macrumors.com/2017/01/06/finder-for-airpods-app/
http://gizmodo.com/finder-for-airpods-app-mysteriously-disappears-from-app-1790999059
http://www.theverge.com/2017/1/9/14211068/airpods-finder-app-removed-app-store
https://www.youtube.com/watch?v=uSG2WSPECT4
The code is in the rough state it was left in when update 1.1 was submitted
The app comes with updated images that do no come from Apple.