Habit & streak tracker for iPhone

See your progress.
Grow your streak.

66 Streaks uses a guided 66-day visual grid to help you build lasting daily habits with fast check-ins, smart reminders, and iOS widgets. Core tools are free.

Download on the App Store How it works

66 Days: guided cycle
Free: core tools
Offline: no account needed

Built for iOS 17+ on iPhone & Apple Watch. Habit data stays private on device.

66 Streaks daily habit check-in and streak screen on iPhone

66 Streaks 66-day visual progress grid on iPhone

Works offline Core tools free 100% private on device No account, ads or tracking

Inside the App

Everything you need to keep going.

Record your progress, let Apple Health handle supported check-ins and plan for the days life gets busy.

66 Streaks daily habit check-in screen with active habits — Select a feature to show its 66 Streaks app screen.

66 Streaks habit progress grids with completion blocks and flame guards — Select a feature to show its 66 Streaks app screen.

Explore every feature →

Why 66 days?

University College London research estimated a median of 66 days for new behaviours to approach automaticity, with wide variation between people and habits. It gives you a realistic runway for repetition, with no fixed deadline.

Why 66 days? See the habit research →

See your progress. Grow your streak.

Everything you need to keep going.

Why 66 days?

Your next 66 days start today.

See your progress.
Grow your streak.