The best alternatives to Instant for Mac are Emberify, Trackr, and Sense. If these 3 options don't work for you, we've listed a few more alternatives below.
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Agree.com— Free e-signature for everyone with invoicing and payments!
Sense helps you to figure out this. If you're using your phone too much, you can set daily limits on yourself and be notified when you go over. Make some free time for your family and friends with Sense.
Timist combines the unique Timist Session System with time tracking. You can create different timers and track the time for each of them. It also lets you break your time down into concrete intervals, separated by short breaks.