Custom work and rest
Set work, rest and up to 99 rounds, with an optional prep countdown.
Interval Timer
Set work and rest rounds for HIIT, Tabata or your own repeated interval pattern.
Duration
Phase
Focus
Round
1 / 4
Next
Break
Completed focus sessions and breaks will appear here.
Countdown to
Event countdown
00:05:00
Ready
Remaining
5 min 0 s
Elapsed
0 s
Ends around
--
More actions
Related tools
How to use the interval timer
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Choose a preset such as Tabata or HIIT, then set Preparation, Work and Rest in seconds. Set Rounds to the number of repetitions. Check the workout plan below the timer, including the initial preparation phase.
Work and rest intervals
Five workout presets
Choose Tabata, HIIT, EMOM, Stretching or Boxing, then adjust the pattern.
Optional sound cues
Enable sound for phase changes and the closing countdown. Vibration depends on device support.
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Phase and round display
See the current phase, round count and workout plan while the timer runs.
No installation
Use the timer in a browser on your phone or computer.
Local settings
Settings and session state are saved in this browser, with no account required.
Frequently asked questions
How do I set up work and rest intervals?
Set work and rest in seconds, choose the number of rounds and add an optional prep countdown. Prep allows 0 to 300 seconds, work 1 to 3600 seconds, rest 0 to 3600 seconds and rounds 1 to 99. The final work round ends the workout, with no rest afterward.
What do the HIIT and Tabata presets include?
Tabata starts with 10 seconds of prep, 20 seconds of work, 10 seconds of rest and eight rounds. HIIT uses 45 second work and 15 second rest rounds. EMOM, Stretching and Boxing are also available. Adjust any preset to build your own repeated pattern.
Will it cue me at each transition?
Enable Sound for work and rest transition cues and a short warning near the end of a phase. Vibration depends on device support. With browser permission, notifications mark each phase change and the end of the workout. Hidden tabs and sleeping devices can delay cues.
Can I set rounds without a rest phase?
Yes. Set Rest to 0 to move straight from one work round to the next, as in the EMOM preset. Prep can also be 0. The display and workout plan show your round count and current phase.
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Can I use it on my phone?
Use it in a browser on your phone or computer, with no installation required. Keep the page open and the device awake if you need timely sound cues. A browser timer cannot guarantee alerts when the device sleeps.
Where are my interval settings saved?
The timer saves the selected pattern and recoverable session state in this browser, with no account required. Clearing site data or using temporary browser storage can remove them.
Technical details
Timestamp calculations
Elapsed and remaining time are calculated from saved timestamps and the device clock, rather than counting display updates. Changing the system clock can affect the result. Hidden tabs and suspended devices can delay phase changes and alerts.
Local session storage
Mode settings and recoverable session state are saved in IndexedDB in this browser. Clearing site data or using temporary browser storage can remove them. Countdown links also contain the event details needed to reopen the shared card.
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Browser cues
Sound uses the browser’s audio API. Notifications require permission, and vibration depends on device support. There is no screen wake lock, so keep the device awake and the page open when you need timely cues.
Shared timing modes
Timer, Stopwatch, Countdown, Pomodoro, Interval and Meeting cost each have a dedicated page. They share a timer engine and local session storage, so switching between these pages can restore the saved state for each mode.