Free · offline · no sign-up
Online stopwatch
Start, log, pause, reset. Each log keeps the running total plus the lap time since your last log, precise to a tenth of a second, so you never have to do the subtraction yourself. Run more than one at a time, each with its own name.
Opens a fresh page with just this tool on it. Everything else is one click away.
How to use it
- 1 Click + to add a stopwatch and give it a name.
- 2 Press Start, then hit Log anytime to record a lap: the running total and the time since your last log.
- 3 Open focus mode to blow the running time up big, or add another named stopwatch to time something else at once.
Frequently asked questions
How accurate is the stopwatch?
It displays elapsed time to a tenth of a second and keeps time against the system clock, so it stays accurate even if the tab is in the background.
Can I record lap times?
Yes. Click Log at any point to save the current elapsed time without stopping the clock. Each entry shows both the running total and the lap time since your previous log.
Can I run more than one stopwatch at once?
Yes. Add as many named stopwatches as you need and start them independently, useful for timing several things in parallel.
Does it work offline?
Yes. Everything in KontrolRoom runs locally in your browser.
It is not just this one tool
The online stopwatch is one block inside KontrolRoom, a modular workspace with notes, a calculating workbook, task boards and 20+ other utilities you can arrange on a single canvas. It all runs locally in your browser, works offline and costs nothing.
Explore the full workspace