About this timer
Interval training turns a long session into a sequence of short, honest efforts. The hard part is usually not the exercise but the counting, especially once fatigue makes the numbers blur. This interval timer builds a schedule from work time, rest time, rounds and sets, then announces every phase change with a sound and a large label.
Use the Tabata preset for twenty seconds of work and ten seconds of rest across eight rounds, the HIIT preset for longer forty-second efforts, or the run-walk preset for one minute of running followed by two minutes of walking. Warm-up and cool-down phases are included in those presets, so the total session is visible before you begin. Custom mode accepts any work and rest length in seconds, up to ninety-nine rounds and twenty sets, with a longer break between sets when you need one.
Pause whenever you like; the schedule freezes and resumes from the same phase. Progress is calculated from the device clock, so a background tab does not shift the boundaries. Keep the tab open, set the volume before you start, and use fullscreen when the phone is on the floor beside you.
How an online timer works here
Every tool follows the same rules: the count is computed from your device clock, the page works without an account, and nothing is sent to a server.
- Pick a preset or enter your own duration. The timer starts in an idle state, so nothing is running until you press start.
- Press start. Remaining time is calculated from an absolute end instant, which keeps the count honest in a background tab or after the device wakes.
- Pause, resume, add a minute or reset whenever plans change. The alarm plays a sound and can send a browser notification if you allow it.
Private by default
Timers, settings and names are stored only in this browser. There is no account, no sync and no server-side history. Clearing site data removes them, and the export tools in other Frixma apps follow the same local-first rule.