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Interval Timer

Simple loop: Work and Rest. No rounds limit.

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

  1. 1Set WORK seconds and REST seconds.
  2. 2Press START to begin the WORK phase.
  3. 3Follow the phase label and transition beeps.
  4. 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).

Related tools

Simple HIIT Timer
For a fixed 30/30 x 10 session with a clear finish.
Simple Tabata Timer
For a fixed 20/10 x 8 Tabata protocol.
EMOM Timer
For minute-based rounds (start work each minute).
AMRAP Timer
For continuous effort blocks without rounds.

Workflows (kits)

Focus & Training Timers Kit
Choose between interval, EMOM, AMRAP, Tabata, and focus timers.