Knock

Knock is a cool app that works with your iPhone and Mac. It gives you a quick and safe way to log into your iMac or MacBook. If you have an iPhone 4s or later running iOS 7 or newer, and a Mac that supports Bluetooth Low Energy, you're all set!

How Does Knock Work?

So, here’s the fun part: with Knock, you just need to tap twice on your iPhone to unlock your Mac when it's on the login screen. It’s super easy! Just make sure your devices are close enough to talk through Bluetooth.

Device Compatibility

It’s important to remember that Knock only works with iPhones starting from the 4s model and up, plus it needs to be on iOS 7 or later. For Macs, they should support Bluetooth Low Energy (most models from 2011 and after do).

Your Magic Unlocking Tool

This means you can use your iPhone to unlock your Mac from a short distance. When you knock twice on your phone, it magically opens up your Mac. How cool is that?

Installing Knock

You will need to download the Knock app for your iPhone, which costs a few bucks in the App Store. Once you've got that installed on both devices, you'll have to set it up by creating a password and adjusting some settings.

The Technology Behind It

The two apps use Bluetooth Low Energy technology for a secure connection that usually reaches about 160 feet (or 50 meters). Your Mac detects when you're nearby—when it's ready for action, the ring around your avatar lights up green.

A Quick & Secure Unlocking Process

Just like knocking on a door or using a car alarm remote, tapping twice on your phone unlocks your Mac instantly! The Knock app quickly enters your password so you don’t have to worry about typing it in every time.

Your Security Matters

The great thing about Knock for Mac is its use of strong security measures like the 1024-bit RSA encryption algorithm. This means only YOUR iPhone can unlock YOUR Mac via Knock.