Timer tools · Workout & rounds
Tabata Timer
Twenty on. Ten off. Everything counted.
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 tabata timer
The default set contains eight rounds of 20 seconds of work followed by 10 seconds of rest. This is exactly four minutes, including the final 10-second rest. Preparation and any recovery between sets are added separately.
Change the work/rest lengths to use a custom variation. The display shows both the set and round, and the plan makes every recovery interval explicit. Choose the length and intensity of your own activity; the timer provides timing, not an exercise prescription.
Why do some Tabata timers show 3:50 instead of 4:00?
Eight work periods and only seven rests total 3 minutes 50 seconds. This timer includes the eighth rest, so its default set totals 4 minutes before preparation or extra recovery.
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.