Protocol66

Build yourself in 66 days

Only for iPhone

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

66 days. 5 habits. Miss a day, start over. The science-backed challenge for building real habits. No excuses. No second chances. Ready to commit? 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. Ready to commit? -------------------------------------------------------------------------------- Privacy Policy: https://www.pocketapps.studio/protocol66/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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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

The developer, Pocket Apps Studio Pte. Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Contact Info

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Contact Info
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary based, for example, on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Size
  • 36.4 MB
Category
  • Productivity
Compatibility
Requires iOS 18.0 or later.
  • iPhone
    Requires iOS 18.0 or later.
  • Mac
    Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 2.0 or later.
Age Rating
13+
In-App Purchases
Yes
  • Pro Version 2,99 €
  • Pro 22,99 €
  • Lifetime Access 4,99 €
  • Learn More
Provider
POCKET APPS STUDIO PTE. LTD.
  • POCKET APPS STUDIO PTE. LTD. has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
  • DUNS Number
    599657040
  • Address
    160 ROBINSON ROAD
    Singapore 068914
    Singapore
  • Phone Number
    +49 15777876580
  • Email
    contact@pocketapps.studio
Copyright
  • © 2026 Pocket Apps Studio Pte Ltd.
  • Developer Website
  • Privacy Policy

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