Protocol66
66-day habit challenge. Miss a day, start over.
Protocol66 launched on January 9, 2026 with 3 votes, #5,632 of 14,584 launches that month and more than 50% of that year's launches.
What it does
A 66-day habit challenge based on research, not bro culture. Pick 5 daily habits. Complete them for 66 days. Miss a day, restart from Day 1. Why 66? Research shows habits take 66 days to become automatic — not 21, not 75. Choose from 8 categories: Move, Mind, Fuel, Hydrate, Reflect, Sleep, Connect, Create. Optional rest days. Friends + leaderboard for accountability. Not another gentle reminder app. Real challenge, real consequences. $4.99 lifetime. No subscription.
Download Protocol66 by Pocket Apps Studio Pte. Ltd. on the App Store. See screenshots, ratings and reviews, user tips, and more apps like Protocol66.
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS. 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 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…from apps.apple.com
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