Focus Timer - Work and Break Cycles with Adjustable Lengths and Rounds

The Pomodoro Technique was developed by Francesco Cirillo in the late 1980s (Wikipedia, checked 2026-10-15). The official site shows a classic timer wound to 25 minutes, then a 5 minute break (pomodorotechnique.com, checked 2026-10-15). This timer starts with those lengths and adds a long break after four work intervals, which is a common convention: the official pages we read do not give the length of a long break, Duke University's Academic Resource Center says 15 to 30 minutes, and Wikipedia says typically 20 to 30. We default to 15 minutes and you can change every length. They are conventions, not rules, and the official site itself says the technique is much more than a sequence of 25-minute sessions. Pomodoro® is a registered trademark (pomodorotechnique.com). This is an independent, free timer. It is not affiliated with, associated with, or endorsed by the Pomodoro Technique® or Francesco Cirillo.

Phases run in order: work, short break, work, short break, and so on. After every N-th finished work interval (4 by default) the break is the long one, and then a new set begins. The round counter shows where you are in the set. Skip moves on to the next phase and does not count a skipped work interval. Reset phase restarts the current phase, and Start over returns to round 1. A work interval that runs to its end adds one to Work intervals completed.

Each phase stores the moment it ends and reads your device's clock, so the time stays right in a background tab. With automatic start on, the next phase begins at the moment the last one ended, even if the page noticed late. If you were away for longer than the whole next phase (the device slept), it waits for you instead of counting phases you did not work through. A sound plays at the end of each phase, a rising chime after work and a falling one after a break, also scheduled on the audio clock ahead of time as a best effort to keep it on time. Browsers only allow sound after a click (MDN autoplay guide), so press Start once.

The count of completed work intervals and your lengths are kept in memory only. They reset when you reload or close the page, and nothing is written to storage or sent anywhere. A change to the lengths applies to the next phase: the one that is running keeps its length. Lengths must be whole numbers: work 1 to 180 minutes, short break 1 to 60, long break 1 to 120, and 1 to 12 rounds. A box that is not valid falls back to the default and says so.