66-Day Streak

What it does

66-Day Streak is a simple iPhone habit tracker designed to help you build habits that last. Track up to 4 habits, check in daily, and use the 66-day framework to stay consistent long enough for habits to feel automatic. Free to download, private by design, and no account required. Learn more: https://66streaks.com/

Build lasting habits with a focused iPhone habit tracker featuring visible streaks, a 66-day progress grid, reminders, widgets, Siri Shortcuts, and no account requirement.

Track daily habits with fast check-ins, a clear 66-day view, reminders, widgets, and Siri Shortcuts. No account setup. No crowded productivity system. Check in quickly, keep progress visible, and use the iPhone tools you already know. University College London research found that new behaviours took an average of 66 days to become automatic, with wide variation between people and habits. It gives you a realistic runway for repetition—not a magic deadline. Choose a small action, set your cue, and let visible progress carry more of thefrom 66streaks.com

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