Habit Setup: A simple onboarding screen where users can choose from predefined habits (e.g., "Drink Water," "Read 10 Pages," "Workout") or type a custom one.
The "Done" Interaction: This is the most crucial part of the app. Marking a habit as "Done" should be immensely satisfying. A simple, large checkbox, a swipe gesture, or a tap-and-hold mechanic with haptic feedback works best.
Streak Tracking: Each habit displays a current streak counter (e.g., "š„ 5 Days") and a personal best. Visualizing an unbroken chain is the primary psychological driver for habit apps.
Smart Reminders: Push notifications sent at user-defined times. The notification itself should have a quick-action "Mark Done" button so the user doesn't even need to open the app.
Visual History: A simple monthly calendar view where days the habit was completed are highlighted with a colored dot.
Simple app to Build and Track Habits with Streaks.