Tether is a duo: one app for your Mac, and one for your iPhone.
We've just soft-launched a new freebie duo app for Mac and iPhone users.
Based on our dev work with Bluetooth Low Energy, Tether is an 'out of sight, out of mind' style tool we originally only built for internal use, which locks your Mac when you walk out of range. Perfect when you're called away and forget to lock your machine.
Check it out: www.hellotether.com