The best alternatives to Blloc are Yahoo, Barephone, and Nokia Z Launcher. If these 3 options don't work for you, we've listed a few more alternatives below.
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Yahoo! is an American web services provider headquartered in Sunnyvale, California, and owned by Verizon Media. The original Yahoo! company was founded by Jerry Yang and David Filo in January 1994 and was incorporated on March 2, 1995. Yahoo was one of the pioneers of the early Internet era in the 1990s.
Barephone is a minimal launcher for Android that lets you see only the apps that you choose. Select just 5 apps to see on the home screen and choose a few additional apps in the app drawer. It lets you hide all the distracting apps and make it a little harder for you to open them. It has a dark theme too!