Pomodoro Timer

What the Pomodoro Timer Does

Press Start and a 25-minute countdown begins; work on a single task until it reaches zero and the readout turns red. Then step away for your break and start another sprint when you are ready. You can change the 25 to whatever sprint length suits you.

It is deliberately just the timer. It does not automatically switch to a five-minute break, count your four pomodoros, or chime — so you stay in charge of the rhythm. If you want the method's structure, you keep it; the tool simply guards the work interval.

How It Works

Under the hood this is the Timer mode of our stopwatch-and-timer, opened with the minutes preset to 25 — the classic pomodoro length Francesco Cirillo settled on in the late 1980s, named after the tomato-shaped kitchen timer he used as a student.

Like the other timers it reads your device's wall clock, so the countdown stays accurate to a tenth of a second, and it refreshes the digits with the browser's repaint loop. In a background tab the display pauses, but the time is not lost — it shows the correct remaining minutes when you return.

Generation algorithm

1. Start a pomodoro. Open the timer (preset to 25 minutes) and press Start as you begin a single task.
2. Work without switching. Focus on that one task until the countdown reaches zero and the readout turns red.
3. Take a short break. Step away for about five minutes — start the timer again at 5, or simply watch the clock.
4. Repeat, then rest longer. After four pomodoros, take a longer break of 15 to 30 minutes.
5. Adjust to taste. Change the 25 to a sprint length that fits your attention and the task in front of you.

Technical Details

Standards & references

• Pomodoro Technique — Francesco Cirillo's method — 25-minute focus sprints, roughly five-minute breaks, and a longer break after four pomodoros.
• Date.now (wall clock) — the device timestamp the elapsed and remaining time are computed from, so the reading does not drift with frame rate.
• requestAnimationFrame — the browser loop synced to the display refresh; it redraws the digits smoothly and pauses while a tab is hidden.

Accuracy & Limitations

It is a single 25-minute timer, not a full Pomodoro app. There is no automatic switch to a break, no count of how many pomodoros you have done, and no long-break prompt after four — you manage the cycle yourself.

The end of a sprint is shown only by the numbers turning red. There is no chime and no notification, so keep the tab visible if you might miss it.

Twenty-five minutes is the classic length, not a rule. Cirillo's point is to protect one unbroken interval; shorten or lengthen it to match the task and your attention on the day.

In a hidden tab the display stops updating. The remaining time is still correct when you come back, but there is no alert while you are away.

Nothing is saved between sessions — a refresh resets the timer, so it will not remember your streak or which pomodoro you were on.

Real-World Use Cases

When to use it — and when not to

Just want a plain countdown at your own length? Use the countdown timer. Need a stopwatch with laps? Use the stopwatch and timer. Want auto-cycling breaks and round counts? That needs a dedicated Pomodoro app.

Frequently Asked Questions

References

• The Pomodoro Technique — Francesco Cirillo (official site)
• Pomodoro Technique (Wikipedia)
• Window.requestAnimationFrame() (MDN)

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