Stopwatch & Timer
Full-featured stopwatch with lap times and countdown timer with preset durations. Progress bar and audio notification on completion.
Last reviewed by the Radiatus Cloud team
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A stopwatch and countdown timer in one
Timing how long something takes and counting down to a deadline are two everyday needs, and this tool does both in one place: a full-featured stopwatch with lap times, and a countdown timer with preset durations, complete with a progress bar and an audio alert when time is up. You never have to switch between two separate tools.
Why laps and presets matter
A stopwatch becomes far more useful with lap times, which record split times without ever stopping the running clock, and that is exactly what timing repeated intervals, workout sets or stages of a process needs. A countdown timer with preset durations saves you from setting the same length repeatedly, and the audio alert means you do not have to keep watching the screen for it to finish. Having both directions of timing, counting up from zero and counting down to zero, together in one place covers essentially every timing need without switching tools, and the progress bar keeps the remaining time visible at a glance.
Time anything
It runs entirely in your browser, so nothing you enter is uploaded and it works without an account, keeping everything on your own machine and available on any device immediately.
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Frequently Asked Questions
What is the difference between the stopwatch and timer?
The stopwatch counts up from zero, timing how long something takes; the timer counts down from a set duration to zero, alerting when time is up.
What are lap times?
Split times recorded without stopping the stopwatch, useful for timing repeated intervals like laps or workout sets without losing the total.
Does the timer alert me?
Yes. It sounds an audio alert when the countdown reaches zero, and a progress bar shows the remaining time as it runs down.
Do I need an account?
No. It runs in your browser with no account, ready to use immediately on any device.
Is my data uploaded?
No. The tool runs entirely in your browser.
Privacy & Security
Runs in your browser. Nothing you enter is uploaded or stored.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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