FocusFlow Pomodoro Timer
A Pomodoro productivity timer with session tracking, customizable intervals, ambient sounds, and daily focus statistics.
Overview
FocusFlow is a Pomodoro technique timer designed for deep work sessions. It provides customizable work/break intervals, session tracking with daily statistics, and optional ambient background sounds to maintain focus.
The app runs entirely in the browser with no accounts required. Session history is stored locally, allowing users to track their daily focus time over weeks and months.
Features
- Pomodoro Cycles: 25/5/15 min default (customizable)
- Session Tracking: Logs completed sessions with timestamps
- Daily Statistics: Total focus time, sessions completed, streaks
- Ambient Sounds: Rain, coffee shop, fireplace (optional, toggleable)
- Visual Timer: Large circular progress indicator
- Browser Notifications: Alert when session ends
- Keyboard Shortcuts: Space to start/pause, R to reset
- Long Break Auto-Start: Automatically start breaks after 4 work sessions
- Session History: Review past days' focus data
Architecture
pomodoro-timer.html
├── <style> → Timer animations, responsive layout
├── <main> → Timer display, controls, stats panel, sound toggles
└── <script> → Timer logic, notification API, audio management, localStorage
Tech Decisions
| Decision | Choice | Why |
|---|---|---|
| Timer | setTimeout + requestAnimationFrame | Smooth visual updates |
| Audio | Web Audio API | No external files needed, generates tones |
| Notifications | Browser Notification API | Native, permission-based |
| Storage | localStorage | Persistent without accounts |
Real-World Impact
The Pomodoro technique is used by millions of developers and writers. FocusFlow removes the friction of setting up a timer and provides enough tracking to identify productivity patterns without the complexity of full project management tools.
Measured Results
- Timer accuracy within 100ms
- Audio generated via Web Audio API (no downloads)
- < 3KB total page weight
- Session history retained across browser restarts
Conclusion
FocusFlow demonstrates that productivity tools can be both simple and powerful. By focusing on the core Pomodoro workflow and adding just enough tracking, it helps users build sustainable focus habits without app fatigue.