Laps with notes, multiple named countdowns, a Tabata-style interval timer, custom alarm sounds, and a fullscreen focus view.
| # | Label | Lap Time | Split (total) | Notes |
|---|
No laps recorded yet — click Lap while the stopwatch is running.
Run as many named timers as you like, side by side.
No countdown timers yet — add one above.
Alternates work and rest periods for a set number of rounds.
Every completed stopwatch, countdown, and interval session — saved only on this device.
Stopwatch counts up from zero to measure how long something takes, with laps. Countdown counts down from a set duration or to a specific date/time and alerts you at zero — you can run several at once. Interval (Tabata-style) alternates work and rest periods for a set number of rounds.
Yes. Add as many named timers as you like from the Countdown panel; each runs independently with its own pause, resume, reset, and completion alert.
Yes. Every recorded lap has an editable label and a short notes field, so you can tag what happened at that split.
Bell, Chime, Digital Beep, Classic Alarm, and Buzzer, all generated locally using the Web Audio API — no audio files are downloaded. You can also upload your own sound file.
The page title updates live with the remaining time so you can see it in the tab bar, and if you allow desktop notifications, a system notification appears when a timer finishes even if the tab isn't focused.
No. Every timer, lap, sound, and history entry runs and is stored entirely in your browser's local storage. Nothing is sent to a server.
No. Like any browser-based timer, it only runs while the tab is open and the device is awake. Countdown timers store their target end time, so reopening the tab before it ends will still show the correct remaining time.
It alternates fixed work and rest periods for a chosen number of rounds — a common structure for workouts, study sprints, or any repeated work/rest cycle — with a distinct sound and screen color for each phase.
Yes. Stopwatch, Countdown, and Interval each have a fullscreen focus view showing just a large clock and basic controls, with a customizable background color.
All tools are free. If they've saved you time, consider supporting us.