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.

Check in quickly, keep progress visible, and use the iPhone tools you already know.

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 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.

Why 66 days? See the habit research →

See your progress. Grow your streak.

Everything you need to keep going.

Why 66 days?

Make tomorrow easier.Start tracking today.

See your progress.
Grow your streak.

Make tomorrow easier.
Start tracking today.