Multiple stopwatches, all on one screen
Run up to 12 independent stopwatches at once. Name each one for an athlete, lane, machine or test, start them together or one by one, record laps on each, and export everything as one CSV.
Loading stopwatches…
When you need more than one stopwatch
- Staggered starts: a coach sends swimmers off 10 seconds apart and starts each watch as they leave the wall; each finish time is then that swimmer's own.
- Mass starts: press Start all (or Space) once, then stop each watch as its runner crosses the line. The list below the cards ranks finished watches by time.
- Time studies: track several workstations or process steps in parallel and export laps per station for a spreadsheet.
- Lab and kitchen work: separate watches for each sample, batch or pan, each with its own label.
“Start all” and “Stop all” read the clock once and apply the same timestamp to every watch, so there is zero offset between them. Each watch stores its own start time, so all of them keep counting correctly while the tab is in the background and survive a reload.
For a single athlete with detailed lap analysis, the main stopwatch has the full lap table, statistics and history. For racing to a target pace, use the split timer.
Questions people ask
How many stopwatches can I run at once?
Up to 12. Each has its own name, start/stop, laps and reset, and they all run independently.
Can I start all stopwatches at exactly the same time?
Yes. Start all uses one clock reading for every watch, so they start with no offset between them. Stop all works the same way.
Are the names and times saved?
They are saved in your browser only (localStorage), so a reload keeps them. Remove a watch with ×, or clear all site data from the privacy page.
Can I export the results?
Export CSV produces one file with every lap and total for every stopwatch, in both formatted time and milliseconds.