Timer tools · Workout & rounds
HIIT Timer
Your workout, from the first warm-up to the last pause.
Ready when you are
Reset this session and its round marks?
Your session at a glance
See every step
Set your rhythm
Preview updates as you edit. Reset an active session before changing its plan.
Make it sound like you
Twelve synthesized sounds. Test your volume before starting. Keep this page open; sleeping devices and background tabs can prevent timely alerts.
Screen awake is off.
Settings and sessions are saved on this device.
How to use the hiit timer
Set work and recovery seconds, the number of rounds, and optional warm-up and cool-down minutes. Preset ratios give you a starting point; all fields remain editable.
Recovery appears between rounds, not after the final round. The final round leads directly into the optional cool-down. A full session preview keeps that total clear. The timer does not select exercises or recommend an intensity.
How is this different from the interval timer?
This page builds a complete workout from warm-up, repeated work/recovery rounds, and cool-down. Use the interval timer when every individual step needs a different name or duration.
What happens if I refresh or switch tabs?
Running timers are recovered from saved timestamps after a refresh. They catch up to the elapsed schedule without replaying a stream of missed sounds. In manual-transition mode, the next step waits for you. Keep the page open and test your sound: background throttling, sleeping devices, or closing the browser can delay or prevent an alert. Changing the device clock can affect recovery after a reload.
Do I need an account?
No. Settings and the current session stay in this browser. They are not synced to an account. Clearing TimeCubby data removes them. Sounds are generated locally, with no audio files downloaded or uploaded.