How accurate is the stopwatch?

It uses the browser clock and displays time to a hundredth of a second. Because timing is based on real elapsed time, it stays accurate even if the tab is in the background.

Does it keep counting if I switch tabs?

Yes. The stopwatch measures real elapsed time between start and stop, so leaving the tab open in the background does not lose time.

What is the difference between a lap time and a split time?

A split (or cumulative) time is the total elapsed time at the moment you tap Lap. A lap time is the duration of that individual segment — the difference between consecutive splits. This stopwatch shows both for each lap.

Can I use it as a Rubik's cube or running timer?

Yes. It is accurate to a hundredth of a second, so it suits speedcubing, sprint intervals, study sessions and cooking. Use Lap to record each attempt or interval without stopping the clock.

Are my lap times saved anywhere online?

No. The stopwatch runs entirely in your browser and laps live only in the current page. Nothing is uploaded or stored on a server.

Online Stopwatch — Gera Tools

Time anything from a workout interval to a Rubik’s cube solve with this online stopwatch. It counts up to a hundredth of a second and lets you record lap and split times while it keeps running — no app, no sign-up.

How it works

When you press Start, the stopwatch records the current timestamp from your device clock. The elapsed time it shows is simply now minus that start time, so it tracks real elapsed time rather than counting ticks. That means the count stays accurate even if the tab is in the background or the page briefly lags. Stop pauses by freezing the elapsed value; Start again resumes from where you left off. Pressing Lap captures a snapshot of the current elapsed time (the split) and records the gap since the previous lap (the lap time) without stopping the clock.

Example

You run four 400-metre laps and tap Lap at the end of each:

Lap	Lap time	Split (total)
1	1:32.40	1:32.40
2	1:35.10	3:07.50
3	1:33.80	4:41.30
4	1:30.05	6:11.35

The split column shows the running total; the lap column shows each segment on its own, making your fastest and slowest laps obvious. Reset clears the time and all laps. Everything runs locally in your browser, with nothing uploaded.