Interval Timer
Repeating interval timer for workouts and training. Configure sets, work period, and rest period with automatic cycling. Input never leaves your device — everything runs locally in your browser.
How to Use the Interval Timer
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Tabata interval timer with 20 seconds work and 10 seconds rest per round. Features a 3-second preparation countdown and configurable rounds. Input never leaves your device — everything runs locally in your browser.
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Frequently Asked Questions
How do I set up a workout?
Set work seconds, rest seconds, and rounds — e.g., 40s work / 20s rest × 8 rounds for HIIT. Audio cues mark each transition so you never watch the screen.
Tabata vs custom intervals?
Tabata is fixed 20s/10s × 8 (use the dedicated Tabata timer). Custom intervals suit circuits, EMOM, and pyramid sets where work/rest ratios differ per round.
Will I hear round changes with the screen locked?
On desktop yes; mobile browsers may silence background audio — keep the tab foreground during workouts or use the device clock app as backup.
Can I save workout presets?
Yes — named presets (e.g., 'Morning HIIT 20min') persist locally, so one tap starts repeat sessions without re-entering rounds.
When using Interval Timer, is anything uploaded?
No. Everything runs locally in your browser. Nothing leaves your device.
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Last updated October 2026