Completely. Utterly. Unnecessary.
A little gimmicky but gee it's fun.
How it works — www.youtube.com/watch?v=CyX8FfSKg04
The website — http://www.knocktounlock.com/
Appshopper history shows this was 99c only once before, for one day (1 January) —
http://appshopper.com/utilities/knock-–-unlock-your-mac-without-typing-a-thing-your-iphone-is-the-password
Description from the App Store (note the description on the page - works with newer Macs only, mostly 2011-12 models and later):
Knock to unlock. Faster and safer than typing a password, for iOS and Mac.
PLEASE CHECK TO SEE IF YOUR MAC IS COMPATIBLE BEFORE PURCHASING. Compatible Macs are listed in the screenshot below.
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. Have a question? Email us at [email protected] and we'll get back to you within a day.
What could make this an awesome app:
Requirement that greater than one knock is required to unlock mac. 3 knocks for example.
Feedback between each knock so that the user can acknowledge the knock has been received by the computer, this could be done audibly by repeating the computer operators name. Penny for example.
Bazinga