Interval timer

Alternating work/rest rounds with beeps — for HIIT and study sprints.

Timed in this browser. Nothing is sent anywhere.

Beeps use the device speaker — keep the tab audible. Timing derives from the wall clock so a throttled tab stays on schedule, but audio may be delayed when hidden. Work/rest up to 3600s each, up to 99 rounds.

How to use

  1. Set work, rest, and rounds.
  2. Press start.
  3. Follow the phase display.

What it supports

Beeps come from the device speaker — the tab must stay audible, and hidden tabs may delay sound. Work/rest 1–3600s each, up to 99 rounds.

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