Interval / Tabata Timer
Set work seconds, rest seconds, and rounds, then run a full-screen work/rest interval timer with round dots and distinct sounds. No app, no login, works offline.
Built by the AbraCalc team
How to play
- Enter your work seconds, rest seconds, and number of rounds.
- Check the phase count and total time shown in the preview.
- Tap Start to go full screen — the timer counts down each work and rest phase automatically.
- Watch the round dots fill in, and listen for the finish fanfare when every round is complete.
Set how long each work interval and rest interval should last, pick your round count, and hit start. The timer fills the screen with a bold countdown, switches color between work and rest, and plays a different sound for each transition so nobody has to watch the clock. Round dots along the bottom track progress at a glance, which makes it easy to run PE circuits, gym intervals, or classroom brain breaks without touching the screen again until it's done. Everything runs in your browser with no login, no app install, and no data leaving your device, so it keeps working even without a signal in the gym.
Frequently asked questions
- Can I run a timer with no rest between rounds?
- Yes. Set rest to 0 seconds and the timer will move straight from one work round to the next with no rest phase inserted.
- Does the timer keep running if I lock my phone or switch apps?
- The countdown only advances while the page is open and visible in your browser, so keep the tab or app in the foreground during the workout.
- Can I pause mid-round?
- Yes, tap Pause in the full-screen view at any time; tap it again (now labeled Resume) to continue exactly where you left off.