Thanks to a new iOS  application it will not be necessary to unlock you Mac, using a password. Knock for iOS enables you to unlock your Mac by simply tapping you iPhone. “You keep your iPhone with you all the time. Now you can use it as a password. You never have to open the app— just knock on your phone twice, even when it’s in your pocket, and you’re in.“

Using Knock won’t drain your iPhone’s battery, even if you use it all day every day. Knock securely communicates with your Mac using Bluetooth Low Energy, a new technology that draws very little power.

Knock works with any Mac that supports Bluetooth 4.0.

You can download Knock for iOS in the App Store for $3,99. You will also need the Mac version which can be downloaded for free here.