Countdown Timer / Stopwatch

A countdown timer and a stopwatch are opposite tools solving the same basic need — tracking elapsed or remaining time — and this combines both into one interface rather than making you find two separate apps. Set a countdown for a fixed duration (a workout interval, a presentation time limit, a cooking step) or run a stopwatch to track how long something actually takes, with lap/split support for timing repeated segments within a single session.

There’s genuinely not much to protect here — a duration and a lap time aren’t sensitive information — so the reason this runs entirely in-browser is less about privacy and more about reliability: a timer that depends on a server round-trip to stay accurate is a timer that can stutter or drift under a bad connection, which defeats the point of something you’re using to time an actual physical task in real time. Everything ticks locally, so it stays accurate and keeps running even offline.

Set a countdown by entering minutes and seconds (or pick from presets like 5, 10, or 25 minutes for common use cases), and start it — an audible alert fires when it hits zero. For the stopwatch, hit start and use the lap button to record split times without stopping the overall clock, useful for timing multiple stages of a task and comparing them afterward.

FAQ

Can I run multiple countdown timers at once?

Yes — the interval mode supports a repeating sequence of work and rest periods (useful for interval workouts or the Pomodoro technique), rather than requiring you to manually restart a single timer for each segment.

Does the timer keep running if I switch to another browser tab?

Yes — the countdown continues in the background and still triggers the alert sound when it completes, even if the tab isn’t the active one.

Why does my stopwatch lap time look slightly different from what I expected?

Lap times measure from the previous lap, not from the start — if you’re expecting a cumulative total instead of a segment time, check which the display is showing, since both are usually available but easy to mix up at a glance.

If you’re timing something with a specific end date or deadline rather than a short duration — days rather than minutes — the Date difference / age calculator is the better fit for that longer time span.