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How does this compare with Knock?http://www.knocktounlock.com/

What are the others?

I've used Knock before and while ultimately I settled on using Alfred (app launcher+) to lock my computer it worked leaps and bounds over this app.

If I understand MacID correctly, the unlock process is interacting with a lockscreen notification, then TouchID?

If my phone is in my pocket (it will be) this takes longer and involves much more juggling than typing in the computer's password directly.

If your phone not in the pocket, then anyone has access to your mac. It's big security hole.