Knock 2.2.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The most popular versions of the software are 1.2 and 1.1. Knock.zip is the most common filename for this program's installer.
This free Mac app was originally designed by Knock Software. Knock is suitable for Mac OS X 10.8 or later. Knock for Mac lies within Security Tools, more precisely Personal Security. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
Knock is a faster, safer way to sign in. 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.
You may want to check out more software for Mac, such as Knock, Knock, ScreenKnock or KnockOutMarble, which might be similar to Knock.
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