Timer tools · Workout & rounds
Interval Timer
Build your rhythm, one interval at a time.
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 interval timer
Add a name and a duration for each step, then choose how many times to repeat the sequence. Use seconds for precise intervals, or switch a step to minutes. Up to 20 custom steps can be combined in one routine.
Unlike a simple work/rest timer, every step can have its own length. Use it for stretching holds, practice drills, a study routine, or a sequence of household tasks. The next step and the total remaining time stay visible throughout.
Can I save and share a custom interval routine?
Your settings stay in this browser. Copy a setup link to share the step names and durations. The link loads a ready-to-start routine; it does not synchronize a running timer with other people.
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.