Having to study for a huge exam with ADHD, my biggest problem has been procrastination or getting distracted once I finally get going. Forest has helped me so much to stop "phubbing" with my phone while studying and has helped my productivity enormously. Gamification of self control was a great idea, I strongly recommend this app to anyone with ADHD, has a lot of studying/ huge project to complete, or anyone that just wants to ensure they cant engage in avoidance behavior on their phone to the detriment of what they should really be focused on.
NYPete about Forest: Focus for Productivity, v3.13.1