The best alternatives to Timewarp are Focus, Self Control, and palpr. If these 3 options don't work for you, we've listed a few more alternatives below.
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Reclaim your productivity by blocking distracting sites and applications, like Facebook and Fortnite. Stay on task and in flow to accomplish your best work!
SelfControl is a free Mac app that helps you avoid distracting websites. Block your own access to websites or mail servers for a pre-set length of time.