Precision in every moment
Track your time. Find your rhythm. A stopwatch for training, study and the everyday.
Multiple Timers
Total time
Lap list
0| Lap | Lap time | Cumulative | Δ | Note |
|---|
Start the stopwatch, then record your first lap.
Sound
Settings
Display
Space: start / pause · L: lap
Your time, on your device. No account required.
Make every moment count
Press Start to begin, Lap to record a split, and Pause to stop without losing elapsed time. Resume continues the same session. Each lap shows its own duration and cumulative time; the difference compares it with the preceding lap. Add a note and export your records as CSV or JSON before resetting.
Frequently asked questions
How accurate is the timing?
The stopwatch measures elapsed time from the browser clock rather than counting animation frames. Milliseconds are a display format, not a guarantee of millisecond measurement accuracy. Reload recovery and countdown deadlines use the device clock; changing that clock can affect results.
Will the alarm work with the screen locked?
Keep this page open and test the sound first. Background tabs, sleep and mobile screen locks can delay or suppress alerts. The remaining time is recalculated when you return, but a closed page cannot sound an alarm. Keep-screen-on works only in supported browsers while the page is visible.
Where are my records stored?
Names, lap notes, timer settings and sessions are stored locally in this browser. The timer does not send these records to a server. Clearing site data removes them; private browsing may not retain them. Downloads are created on your device.