
Protocol66
Build yourself in 66 days
0 ratings
Free
In-App Purchases
About
66 days. 5 habits. Miss a day, start over.
Protocol 66 is the science-backed alternative to extreme fitness challenges. Based on habit formation research — not bro science — it takes exactly 66 days to build lasting habits.
THE RULES ARE SIMPLE
- Pick 5 daily habits
- Complete all 5 every day
- Miss a day, restart from zero
- Rest days are earned, not given
WHY 66 DAYS?
Research by Phillippa Lally at University College London found it takes an average of 66 days to form automatic habits. Not 21. Not 30. Not 75.
THIS ISN'T FOR EVERYONE
No streaks to protect you. No lives. No second chances. If you're looking for an app that goes easy on you, this isn't it.
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What's New in Protocol66
1.0.1
January 29, 2026
Version 1.0.1 • Late Logging - Forgot to log yesterday? Now you can catch up before your challenge fails • Challenge Failed Card - Clear visibility when challenges end with easy restart options • FAQ Section - Find answers to common questions in Profile • Better Notifications - Stay on track with evening reminders and milestone celebrations • Bug fixes and performance improvements for iOS 26
MoreSubscription plans
Pro
Get access to the App
$19.991 Year
7 Days trial3
In-App Purchases
$3.99
Lifetime Access
Gives Lifetime Access to the app





