I like the concept of this app. When it works, it works flawlessly and it is very responsive to every tap. However, even with Bluetooth turned on, it often doesnt connect to my Mac when the app is not running. This app also requires Bluetooth to be on which can drain battery quite noticeably on iPhone 5. Looking forward to improvements!
Arthur.me about Knock – unlock your Mac without a password using your iPhone and Apple Watch, v1.0.1