A free online interval timer for any work/rest protocol — HIIT, Tabata, circuit training, boxing rounds, sports drills, and productivity cycles. Use Polytimer's Multiple Timers tab to run simultaneous work and rest timers that repeat automatically. No app, no sign-up, works in any browser.
Add a second timer with a different duration, colour and alarm sound for anything you want to track alongside it — each card keeps its own alarm, so you can tell them apart without looking at the screen.
For work and rest phases that alternate automatically, use the Pomodoro tab instead. It switches between focus and break periods on its own and signals every transition, which a pair of independent repeating timers cannot do — two timers running at once overlap rather than take turns.
Interval timing is not limited to exercise. The Pomodoro Technique applies the same work/rest structure to cognitive tasks: 25 minutes of focused work alternating with 5-minute breaks. Research shows this prevents mental fatigue, improves retention, and creates a measurable record of effort.
For study intervals, use the study timer or the Pomodoro timer which automates the full Focus → Short Break → Long Break cycle.
An interval timer alternates between a work period and a rest period repeatedly. You set the duration of each phase and the number of rounds, and the timer handles the transitions. Used for HIIT, Tabata, sports drills, and productivity cycles like the Pomodoro Technique.
Polytimer handles intervals two ways. For a repeating round of a fixed length, open the Multiple Timers tab, add a timer, set the duration, choose an alarm sound and enable Repeat — it sounds and restarts after every round. For work and rest phases that alternate on their own, use the Pomodoro tab.
Common HIIT settings: 20s/10s (Tabata), 30s/15s (beginner), 40s/20s (intermediate), 45s/15s (advanced). Tabata specifically uses 20s work / 10s rest for 8 rounds (4 minutes total).
Yes. The Pomodoro Technique is an interval system: 25 minutes focused work / 5-minute break. For automated cycling with automatic Focus → Short Break → Long Break transitions, use Polytimer's dedicated Pomodoro tab.
Boxing (3-minute rounds / 1-minute rest), wrestling, MMA, cycling sprints, swimming intervals, track running, rowing ergometer intervals, and basketball or football drill sessions all use interval timers. Multiple Timers lets you set any work/rest ratio for any sport.