A habit tracker for the long game
Turn one meaningful goal into small daily actions. Track your consistency, reflect on what worked, and give change a realistic runway.
For iPhone, iPad and Apple Watch · In-app purchases
A realistic runway
Your pace can be different. Keep showing up.
Goal-based projects
Good and bad habit modes
English + 10 more app languages
The number, in context
In a University College London study, the average time for a repeated behaviour to feel automatic was 66 days. Individual results varied widely, from 18 to 254 days, and missing one opportunity did not materially derail the process.
So 66 Days gives you a clear horizon without pretending that change follows a stopwatch.
Evidence to action
Each field note keeps the source, study limits, and one small action together—so a useful idea never loses its context.
Browse all habit articlesSimple enough to repeat
66 Days keeps the system light so the habit—not the tracker—gets your attention.
Create a focused project for the change you want to make, from moving more to spending less time scrolling.
Break the goal into habits you can actually do today, then set reminders where a prompt will help.
Mark what happened, add a note or photo, and use streaks and history as feedback—not judgement.
Built around real behaviour
A calm place to build good habits, reduce the ones that get in your way, and see the story your days are telling.
Group several daily actions under one meaningful goal instead of juggling a flat list.
Use a mode that matches the change: repeat a helpful action or notice and interrupt an unwanted one.
See daily consistency, longest streaks and activity over time without turning progress into pressure.
Capture context when it helps and set timely prompts for the actions that are easy to forget.
Check in from iPhone, iPad or Apple Watch, and glance at remaining habits from the home-screen widget.
Use the app in English and ten additional languages, with light and dark appearances.
Clear about your data
The app stores habit information on your device and may sync it through Apple iCloud. Current production versions may use product analytics, while Epipherse handles support by email. This website has no advertising trackers or non-essential cookies.
Good to know
No. Sixty-six days was the average in one influential study, not a guarantee. The same study found wide variation between people and behaviours. Treat day 66 as a useful horizon, then keep the routine that works for you.
A missed check-in may affect an in-app streak, but it does not erase what you have learned. The research suggests one missed opportunity does not materially derail habit formation. Resume with the next useful action.
The app is free to download and includes in-app purchases. Optional subscriptions and one-time purchases unlock additional features. Current local pricing and terms are always shown by the App Store before purchase.
66 Days is available for compatible iPhone, iPad and Apple Watch devices. Compatibility requirements can change, so the App Store listing is the source of truth for your device.
Habit records are stored on your device and may sync through iCloud on supported versions. Some usage analytics and support information are processed by service providers. The Privacy Policy explains the exact categories and purposes.
Start where you are
Choose one meaningful goal, make the actions small, and let consistency do the quiet work.
Start your first 66 days
