番茄钟计时器

The idea behind the Pomodoro Technique

The Pomodoro Technique, created by Francesco Cirillo in the late 1980s, is built on a simple observation: sustained attention is a limited resource, and you protect it better by working in short, protected bursts than by grinding for hours. You commit to one task for a fixed stretch — traditionally 25 minutes — with no interruptions, then take a deliberate break before the next stretch. The name comes from the tomato-shaped ("pomodoro" in Italian) kitchen timer Cirillo used as a student. This tool implements that cycle with a visual countdown ring, automatic break scheduling, and browser notifications.

How the cycle is structured

A full Pomodoro cycle alternates focused work with two kinds of rest. The default rhythm is:

The key rule is the long break cadence. After every fourth completed focus session the timer schedules a long break instead of a short one, then the count resets and the pattern begins again. The four dots beneath the timer track your progress through the current set, filling in as each focus session completes, so you always know how close you are to the longer rest.

What happens when a session ends

When the countdown reaches zero, three things happen automatically. The timer stops, the page title updates so a glance at your browser tab shows the remaining time even when the tab is in the background, and — if you have granted permission — a browser notification pops up telling you whether to start a break or get back to focus. The tool then loads the next phase's duration and waits for you to start it, so a break never silently rolls into work. The countdown ring also changes colour for each phase (green for focus, blue for a short break, purple for a long break), giving an at-a-glance sense of which mode you are in.

A worked example: a two-hour study block

Suppose you sit down at 2:00 with the default settings. You complete focus sessions ending at 2:25, 2:55, 3:25, and 3:55, with 5-minute short breaks at 2:25–2:30, 2:55–3:00, and 3:25–3:30. Because the fourth focus session is the trigger, the break after 3:55 is a 15-minute long break rather than a 5-minute one. In two hours you bank four solid 25-minute work blocks — 100 minutes of focused effort — with regular recovery built in, and one of the dots fills after each block until all four light up and reset.

Customising the rhythm

The classic 25/5/15 split is a starting point, not a rule. Open the settings gear to change the focus length, the short and long break lengths, and how many sessions occur before a long break. Some people focus better in 50-minute deep-work blocks with 10-minute breaks; others, doing shallow or fatiguing work, prefer 15-minute sprints. Adjust the numbers, press Apply, and the timer resets to the new pattern. If a particular setting consistently leaves you restless before the bell or drained by the end, that is your signal to shorten or lengthen the session.

Practical tips for getting real benefit

• Grant notification permission on the first start. The timer asks once; allowing it means you can switch tabs and still be pulled back when a phase ends, instead of having to watch the clock.
• One task per session. The technique's power comes from protecting a single block of attention. Decide the task before you press Start, and treat the 25 minutes as off-limits to everything else.
• Park distractions, do not chase them. When a stray thought or notification arrives mid-session, jot it down and return to it on the break rather than breaking focus.
• Actually take the break. The rest is not optional padding — it is what makes the next session productive. Stand up, look away from the screen, and let your attention recharge.
• Use the long break to step fully away. After four sessions your focus genuinely needs the longer reset; a proper 15-minute pause prevents the afternoon slump.

Common mistakes

• Skipping breaks to "save time." Working straight through erodes the focus the technique is designed to preserve, and the later sessions suffer.
• Pausing constantly. The Pause button exists for genuine interruptions, but if you pause every few minutes you are not really running a focus session.
• Setting unrealistic sessions. A 90-minute "focus" block defeats the purpose; if you cannot hold attention that long, you will drift and the timer becomes meaningless.
• Relying on the tab to be visible. If notifications are blocked and the tab is hidden, you may miss the transition — keep permission granted so the alert reaches you.

Privacy

The timer runs entirely in your browser. Nothing about your sessions is uploaded or stored on a server; notifications are generated locally by your browser, not sent from outside. Close the tab and the timer simply stops.