With the arrival of iBeacons in iOS 7, Apple was clearly moving into retail and public spaces in a whole new way. [...] With this new technology in-hand, it wasn’t too long before I put together a brand new office In/Out tracker called PunchClock. It uses a combination of a geo-fence and iBeacon tracking, plus a simple Sinatra backend hosted at Heroku.
The guys at Panic have been experimenting with iBeacons and have open-sourced the result, an internal app that tracks who is and isn’t at the office (although, as they put it, “it’s not for the faint of heart”).
There was a great CocoaRadio episode about iBeacons a few weeks ago as well.