Protocol66 – A 66-day habit challenge with strict daily tracking

Summary: Protocol66 is a habit-building app based on research that habits take 66 days to form. Users select five daily habits across eight categories and must complete all every day for 66 days, restarting if they miss a day.

What it does

It enforces a 66-day habit challenge by requiring completion of five chosen habits daily, with an option for rest days and social accountability through friends and leaderboards.

Who it's for

Individuals seeking a research-backed, disciplined approach to habit formation with clear consequences for missed days.

Why it matters

It addresses the misconception that habits form in 21 days and provides a structured method to build lasting habits over the scientifically supported 66-day period.