AppBlock is described as 'mobile application that lets you block annoying apps & websites, bringing down your screen time and helping you focus on more important things'. There are more than 50 alternatives to AppBlock for a variety of platforms, including Mac, Windows, Android, Google Chrome and Linux. The best alternative is LeechBlock, which is both free and Open Source. Other great apps like AppBlock are Cold Turkey (Freemium), Forest (Freemium), FocusMe (Paid) and SelfControl (Free, Open Source).
LeechBlock is a simple free productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.
SelfControl is a free and open-source application for Mac OS X that lets you block your own access to distracting websites, your mail servers, or anything else on the Internet. Just set a period of time to block for, add sites to your blacklist, and click "Start.
Freedom is an application that disables networking on an Apple computer for up to eight hours at a time. Freedom will free you from the distractions of the internet, allowing you time to code, write, or create.
BrowseControl is an agent-based web filter that blocks websites based on URLs and categories. Internet use quotas can be set based on schedules and timers. Includes a port filter and Windows application blocker.
App Usage is the easiest to use but powerful app/device usage management app.
It provides the following key features:
App usage history: gather the usage time about apps that you used
Activity history: gather the time that you open apps