Stopwatch

A stopwatch sounds simple until you actually need one that keeps up with real timing work — tracking multiple runners in a race, timing repeated intervals in a workout, or logging how long each phase of a task takes. This online stopwatch runs with millisecond precision directly in your browser, so you get a level of accuracy that a phone's default clock app or a basic kitchen timer usually can't match. There's no app to install and no account to create; you open the page and start timing immediately.

What sets it apart from a plain start/stop timer is lap and split tracking. Each time you hit the lap button, the current time is recorded and the clock keeps running, letting you capture a sequence of intervals — one lap per repetition, one split per checkpoint — without losing the overall elapsed time. Once you're done, you can export the recorded lap and split data instead of manually copying numbers off the screen, which matters if you're logging results for a team, a class, or your own training log. A full-screen mode strips away the browser chrome so the running time is readable from across a room, which is useful during group activities or presentations.

Because everything runs client-side, nothing about your session — start time, lap count, or how long you spent timing something — is uploaded anywhere; the numbers exist only in your browser tab until you export them. That also means the stopwatch keeps working with no network dependency once the page has loaded, and there's no signup wall between you and pressing start. A practical habit: use laps when you care about each individual interval (like each lap of a track) and splits when you care about cumulative checkpoints (like each mile of a longer run), since mixing up the two is the most common source of confusing results afterward.