Passcodes are great for keeping prying eyes out of your Mac, but what if you could make unlocking your computer a stunningly cool experience and more convenient at the same time? You know, like maybe knock on your iPhone as if it were a door. That's exactly what Knock lets you do. Once the app is installed on your iPhone, and the companion app is running on your Mac, you can unlock your computer simply by knocking twice on your iPhone. The app uses Bluetooth LE, so you need an iPhone 4S or newer, and at least a 2011 MacBook Air Mac mini, a 2012 MacBook Pro, or the 2013 Mac Pro. Setup is wonderfully simple, as is knocking on your iPhone to unlock your Mac. The Mac app is a free download at the Knock website, and the iPhone app is a US$3.99 download at Apple's iTunes-based App Store.
Check It Out: Knock for iPhone: Unlock Your Mac with a Knock