Forest is described as 'Grow virtual trees by staying focused, track productivity as your forest expands, avoid phone distractions, share progress, and utilize a customizable whitelist' and is a anti procrastination tool in the office & productivity category. There are more than 100 alternatives to Forest for a variety of platforms, including Android, iPhone, Mac, Windows and iPad apps. The best Forest alternative is Mindful : Focus & Screen Time, which is both free and Open Source. Other great apps like Forest are LeechBlock, DigiPaws, Cold Turkey and SelfControl.
Forest is based on a completely different concept than cold turkey, cold turkey is more or less just a blocker whereas Forest is a productivity app which forces the person to stay and work and not waste time for a set amount of time