Just wait for Apple to add this function...
I tried this product 2 or 3 years ago. It was a cool idea, but it did not work anyting like I needed it to or like it says it did. Plus I did not want to be knocking on my iPhone screen.
Fast forward a few years later... I heard about this app again on a Applebyte. I throught, "well if it is still around it they must have fixed the issues that they had with it when I tried it years ago". NOPE!
It still does not do what they show it can do in the video on the webpage and when my computter has been asleep for a while, it will show a cool color ring around my picture at login, but it wont do anything. I open the app on the phone and nothing I restart the app and.... thats right nothing. It just does not work.
I heard that Apple was working on a similar function for the next MacOS. Just wait!
Even the idea of Apple possibly working on a similar function is better than this app which already exist. I wasted a lot of time with Knoc, on more than one occasion and now I have to say "please do not even waste your time with this". Great idea, but horible execution.
dr.digsphd about
Knock – unlock your Mac without a password using your iPhone and Apple Watch, v2.0.2