Protocol66

66-day habit challenge based on habit-formation research

iOSfreemiumglobal

Protocol66 is a 66-day habit challenge app based on research showing habits take 66 days (not the popular 21 or 75) to become automatic. Users pick 5 daily habits across 8 categories and restart from Day 1 if they miss a day, aimed at people who want a research-backed, no-nonsense habit challenge.

Website iOS

Full match profile

Behind the summary, Matchbox keeps a richer profile of Protocol66 - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

Claim Protocol66 to unlock →

Try Matchbox with your own problem

Describe what is not working - we’ll show you whether Protocol66 (or something else) actually fits.

Try a problem