Run work/rest intervals hands-free
Tabata, HIIT, or study sprints — set the two intervals once and let the beeps drive.
Tools used in this guide
The job
30 seconds work, 15 seconds rest, 8 rounds — the timer alternates phases and beeps at each switch, showing the current phase, countdown, and round number.
Setting it up
Work and rest take 1–3600 seconds, up to 99 rounds. The display derives from the wall clock, so a backgrounded tab stays on schedule even if the screen updates less often.
About the beeps
Sound comes from your device's speaker through the Web Audio API — keep the tab's audio on. Hidden tabs can delay the beep; the timer itself stays accurate. There is no pause — stopping ends the session.