GoodHabits: 66-Day Tracker

Habits in a 66-day arc

Only for iPhone

Free · In‑App Purchases

iPhone

New in 3.0: interactive widgets, a grace day for missed logs, and reminders you can check off right from the notification. No tracking — your data stays on your device. One habit, one 66-day arc – calm, with no noise. GoodHabits walks with you while you build a habit across a fixed arc of 66 logged days. The number comes from University College London research (Lally et al., 2010): there, the time until a new habit felt automatic was 66 days at the median – across a range of 18 to 254 days. So 66 is a reference point, not a finish line. Why an arc instead of endless streaks: - A manageable frame with a defined end, not a counter without a horizon - A grace day: a missed day can be logged until the end of the following day - Home Screen widgets – one glance is enough, and logging never opens the app - Calm progress display that keeps your completed days visible A good fit for: - Morning routines and healthy habits - Fitness and nutrition goals - Productivity and work habits - Mindfulness and self-care No tracking, no analytics SDKs, no account: your data stays on your device. If your habit still needs attention after 66 days, that is not failure – that is the spread the study actually reports.

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We made our description of the research more precise: 66 days is the median, and the range ran from 18 to 254 days. The FAQ, onboarding and milestone texts now say so.

Version 3.0.2

The developer, Simon Bogutzky, 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 Not Collected

    The developer does not collect any data from this app.

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

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • VoiceOver

      • Larger Text

      • Dark Interface

      • Differentiate Without Color Alone

      • Sufficient Contrast

      • Reduced Motion

    Information

    Seller
    • Simon Bogutzky
    Size
    • 16 MB
    Category
    • Productivity
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    Languages
    • English and German
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © Dr. Simon Bogutzky
  • Developer Website
  • Privacy Policy

    • More by Simon Bogutzky

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