Serene

Block distracting websites and get more done with Serene, a productivity browser extension for laser focus.
Block distracting websites with ease using the Serene Chrome Extension. When you click 'Go Serene' you will start a focus session - which can last from 15-60 minutes. Visiting a website on your block list during a focus session will replace the distracting website with a reminder of the go.

Designed for remote and knowledge workers that have a lot of tasks to complete.