Knock: Unlock your Mac by knocking on your iPhone

Image via Knock Software

Knock Software looks to give busy Mac and iPhone users a way to quickly and securely unlock their Macs without constantly typing in their password. Its Knock app has been released on iOS this week, allowing users to simply knock on their iPhone’s screen to unlock their Macs via Bluetooth.

Knock Software promises Knock won’t drain an iPhone’s battery, as it connects to the Mac via Bluetooth Low Energy, which draws little power. So long as you’re within range of your Mac, you can knock twice on the iPhone’s screen to unlock the Mac, even if your iPhone is in your pocket.

Knock is similar to Keycard, which locks and unlocks a user’s Mac whenever the associated iPhone (or other supported device) leaves or enters the Mac’s area. However, where users may inadvertently lock or unlock their Macs with the wrong physical movement, it seems less likely that one could accidentally trigger Knock.

Knock is compatible with newer Macs, and with iPhone 4S+. It’s now available to download for $3.99 on iTunes, with the Mac client being available for free on Knock Software’s website. Check out the list of compatible Macs below, and check back soon to follow Knock’s growth on AppData, our tracking service for mobile and social apps and developers.


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