Interval Timer: Guide
- Intent
- Free interval timer online for work/rest training: set seconds for WORK and REST, then loop with clear phase labels and two-tone cues.
- What it does
- Loops between WORK and REST forever until you stop it, playing different tones on each transition.
- Key features
- Custom work/rest seconds, Unlimited rounds, Two-tone phase cues
- Privacy
- Runs locally in your browser. No data is uploaded.
- Best for
- HIIT, sprint intervals, circuits, and any work/rest routine
- Micro-interval focus sessions when you want a simple work/rest timer
- Anyone who wants an interval timer online without setting rounds
- Why this tool
- Unlimited rounds by design (no extra configuration)
- Two-tone transitions so you can keep your eyes off the screen
- Local-first: runs in the browser with no uploads
How to use
- 1Set WORK seconds and REST seconds.
- 2Press START to begin the WORK phase.
- 3Follow the phase label and transition beeps.
- 4Press STOP & RESET when your session is finished.
Common mistakes
- Assuming it stops automatically after N rounds (it loops forever).
- Trying to edit WORK/REST while running (stop first).
- Muted device audio means you miss transition cues.
Examples
Classic 30/15 intervals
Work: 30s
Rest: 15s
Loops until you press STOP & RESET
Tabata-style without rounds
Work: 20s
Rest: 10s
Stop manually after 8 rounds (or keep going).