Stopwatch, Countdown & Interval Timer

Combines a stopwatch with laps, a countdown with presets, and an interval timer (prepare, work, rest, rounds) on a single drift-resistant time engine — elapsed time is always recalculated from real timestamps, never by counting setInterval() executions.

Processed on your device, no AIsin límite práctico de vueltas o rondas

00:00:00.00

Status: Idle

The data is processed on your device and is never sent to the server.

Use cases

Time a workout with laps
Set up a quick countdown
Structure work and rest intervals

How to use this tool

Choose stopwatch, countdown, or intervals
Set the duration or rounds
Start, pause, or reset

Frequently asked questions

Does it lose accuracy if the tab goes to the background?

Elapsed time is always recalculated from real timestamps when focus returns — it doesn't depend on every interval firing on schedule.

Does it request permissions when the page loads?

No. No notification permission is requested and no audio plays until an explicit action from the visitor.

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