This is a great app. It usually works all the time. Sometimes it doesnt register the knock but that does not bother me. I find that recently when my iPhone gets connected to my Mac my keyboard brightness gets shut off. When I go to raise the brightness it shows up that the brightness is at one bar when its not on at all. Thats the only problem I have. Everything else works like a charm.
Josephd534 about Knock – unlock your Mac without a password using your iPhone and Apple Watch, v1.0.3