‘Knock’ Lets You Securely Unlock Your Mac By Pounding Your iPhone Screen

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Typing in your password every time you want to unlock your Mac sucks. Apple still hasn’t added facial ID recognition to OS X, nor have we heard nary a mention of Touch ID coming to MacBooks, but if you’re looking for a neat way to quickly unlock your Mac, a new app called Knock allows you do it with two quick taps on your iPhone screen.

The free Mac app works in tandem with an iPhone app that turns your phone into an authentication device. Knock uses Bluetooth Low Energy to communicate from iPhone to Mac but you should be able to leave it on all day without draining battery.

Here’s a video of Knock in action:

‘Knock’ Lets You Securely Unlock Your Mac By Pounding Your iPhone Screen

Because Knock requires Bluetooth 4.0 it only works on the iPhone 4s, 5, 5c and 5s and the following Macs:

  • 2011 MacBook Air or newer
  • 2012 MacBook Pro or newer
  • 2012 iMac or newer
  • 2011 Mac mini or newer
  • 2013 Mac Pro

The Knock for Mac is a free download but the iPhone app will cost you $3.99.

  • CodiHandley

    This is a joke right? I mean, your fingers are right there on the keyboard.

  • barleymcgrew

    I thought it might be a stupid thing but one advantage it does have is that while you may have the keyboard there, if there happens to be someone that you don’t want to see you entering your password it makes it possible to access your Mac without entering that password.

    Now the only thing to worry about is ‘losing’ that iPhone, lol

  • Falafelhead

    lol @ $3.99 for the iPhone app – worst priced app ever

  • TheMartinDobson

    Beautiful app, worked perfectly.

    Damn some of you guys are so cheap. You’ll spend $8 on a coffee but not $4 for some good software that adds a feature that actually works really good?

  • Stuka_UK

    I have a late 2012 MB Pro with BT 4.1. When I downloaded the app it said I didn’t have low power BT and was therefor not compatible…. What gives?

  • barleymcgrew

    I spent the money gave it a try, nice idea but… is a huge killer of iPhone Battery life. 3% in 20 minutes without using the phone at all. I uninstalled it. Will come in handy though to reinstall when I have visitors staying but not keeping it installed for regular use.

  • TheMartinDobson

    I spent the money gave it a try, nice idea but… is a huge killer of iPhone Battery life. 3% in 20 minutes without using the phone at all. I uninstalled it. Will come in handy though to reinstall when I have visitors staying but not keeping it installed for regular use.

    Ummm.. I think that you might have something else draining your battery. I’ve had KNOCK loaded and my 5S away from a power source for the last 10 hours and am only at 64% battery life.

About the author

Buster HeinBuster Hein is Cult of Mac's Senior News Editor and lives in Phoenix, Arizona. Twitter: @bst3r.

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