Hyperfocus is described as 'The distraction blocker for macOS'. There are five alternatives to Hyperfocus for a variety of platforms, including Mac, Windows, Online / Web-based, Android and Google Chrome. The best alternative is FocusMe. It's not free, so if you're looking for a free alternative, you could try GoalEnforcer Hyperfocus or Baitblock. Other great apps like Hyperfocus are Focus (Paid) and Motion (Paid).
Focus is a Mac app that blocks distracting websites (like Facebook and Reddit) and applications, so you can improve your productivity. It has lots of awesome features like scheduling, showing motivational quotes on blocked pages, whitelisting and pomodoro support.