A pomodoro break timer

This page starts counting 5 minutes the moment it opens, and makes a sound when it finishes. Nothing to set, and nothing to press first.

What people set 5 minutes for

The short rest between working sprints: stand up, look away from the screen, and do not open anything with a feed in it.

Worth knowing

The break is the part people skip, and skipping it is what turns the fourth sprint into the one where nothing gets done.

Questions

Do the timers keep running if I switch tabs?

Yes. The countdown is measured against a monotonic clock rather than counted in ticks, so a backgrounded tab, a throttled timer or a laptop lid closing does not lose time — when you come back it shows what it should, not what it managed to count.

Does a timer survive a daylight-saving change?

Yes, and the distinction matters. A countdown measures elapsed real time, so a timer set for six hours across a spring-forward still runs six real hours even though the wall clock advances seven. An alarm set for a wall-clock time does the opposite: it fires when the clock says so, which is what you want from an alarm.