Pomodoro Focus Timer
Timestamp-accurate 25/5 cycles with sound and optional notifications — works in background tabs
Focus · session 1/4
25:00
Timers run on timestamps, so they stay accurate even in background tabs. Notification permission is only requested when you enable notifications; otherwise a sound plays instead.
Cycle settings
Completed focus sessions this cycle: 0
Examples
Classic 25/5 workday
Defaults: 25 · 5 · 15 · long break every 44 focus blocks + 3 short breaks + 1 long break ≈ 2h 15m per cycleZero clicks between phases once started.
About this tool
The full classic cycle — focus, short break, long break every fourth session — as a timestamp-based state machine. Remaining time is computed from wall-clock differences, not accumulated ticks, so throttled background tabs never drift and the countdown mirrors into the tab title.
Phases end with distinct Web Audio chimes (triple for focus, double for breaks); notifications are strictly opt-in and requested only when you enable them. All durations and the long-break interval are configurable.
How to use
Start a session
Press Start — the focus countdown begins and the tab title tracks it.
Work until the chime
Three beeps end focus; the short break starts automatically, hands-free.
Cycle through
After every Nth focus session the long break is scheduled automatically.
Tune the rhythm
Adjust focus, breaks and the long-break interval to your own pattern.
Use cases
Deep work blocks
Timestamp accuracy means the timer is right even after long stays in another tab.
Study sessions
52/17 or 90-minute variants are one slider away.
Common mistakes
Mistake:Comparing tick-based timers and expecting equal accuracy
Fix:Countdowns that count setInterval callbacks drift under tab throttling; this one can't.
Mistake:Skipping breaks to 'bank' focus
Fix:The break structure is what sustains focus quality — the cycle enforces it gently.
Frequently asked questions
Related guides
Net WPM: The Typing Metric That Doesn't Lie
Gross WPM rewards speed; net WPM subtracts your errors. The 5-character word standard and the math behind honest typing scores.
BMI and TDEE: Two Numbers, One Formula Each
Mifflin-St Jeor for calorie needs, WHO bands for BMI classification — what they measure, what they miss, and reading the healthy weight range.
White, Pink, Brown: The Physics of Focus Noise
Why pink noise is the productivity favorite, how each color is synthesized mathematically, and mixing them live in the browser.
References & standards
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