Lockr is an app that, once paired with your Mac, will check if your iPhone is around. Lockr will automatically lock and unlock your Mac depending on the distance to your iPhone.

Stop relying on timeouts or remembering to lock your Mac. Lockr will automatically lock your Mac when you’re not there to keep an eye on it.

Lockr uses the RSA algorithm to make sure the Mac is talking to the right iPhone and vice-versa. You won’t have to worry about someone trying to replicate the signal to unlock your Mac.