Starting today, all iPhone and Mac users can say goodbye to unlocking their computers by typing a password. Introducing Knock – an app that turns your iPhone into an incredibly secure password for your Mac.
Knock isn’t like other apps. It’s always ready, so you can use Knock even when your phone is in your pocket. Just knock twice, and your Mac unlocks. That’s it. Knock uses Bluetooth Low Energy, which means your iPhone’s battery won’t feel a thing.
You will need two things: Knock for OS X ( free ) and Knock for iOS ( $3.99 – iTunes link )