Streaks — Product Requirements Document

1. Problem Statement

People start habits but lose momentum because tracking is tedious and reminders are easy to ignore. Streaks makes daily check-ins a one-tap action and uses streaks plus gentle reminders to keep momentum.

2. Product Vision

A delightful, fast habit tracker that respects attention — minimal taps, works offline, and motivates with visible streaks rather than guilt.

3. Goals & Success Metrics

• Habit formation: 40% of users maintain a 7-day streak in week one.
• Retention: Day-30 retention above 25%.
• Speed: logging a habit takes under 2 seconds from app open.

4. Platforms & Personas

• Platforms: iOS and Android (cross-platform, e.g. React Native or Flutter).
• Ana — Self-improver: wants quick daily check-ins and a clear view of progress.

5. Functional Requirements

Habits

• Create habits with frequency (daily/weekly), icon, and color.
• One-tap daily check-in; edit past days.

Motivation

• Streak counter and a monthly heatmap calendar.
• Configurable reminders (local notifications).

Sync

• Works fully offline; syncs to the cloud when connected.

6. Non-Functional Requirements

• App cold-start under 1.5 seconds.
• Local-first data; conflict-free sync across a user's devices.
• Notification permissions requested with clear context.

7. Data Model

8. Notifications

• Per-habit reminder times; quiet hours; streak-at-risk nudge in the evening.

9. Milestones

• Phase 1 (3 wks): habits, one-tap check-in, streaks, offline storage.
• Phase 2 (2 wks): reminders + heatmap calendar.
• Phase 3 (2 wks): cloud sync across devices, app-store release.

10. Risks & Open Questions

• Notification fatigue could hurt retention — defaults must be gentle.
• Open: is an account required at launch, or can v1 be fully local with optional sign-in?