Multiple Stopwatches
Up to 6 independent stopwatches on one screen — each with its own name, its own colour, its own laps and its own Start. For lanes, heats, groups, stations or six things on the stove.
Each stopwatch runs on its own — Start all is for a common gun. The palette button on each card sets that card's name and colour, so you can tell six cards apart at a glance. 6 fit the wide layout and 3 the narrow one; the layout button switches between them. Everything is saved on this device. CSV writes one row per stopwatch — name, a column per lap, then the total — and Share saves the same board as an image; both files are named for the date, the time and the cards you renamed. Keyboard: Space start/stop all · R reset all · F full screen.
When six beat one
A single stopwatch answers "how long did that take". Six answer "which of these was quicker", and that is a different question with a different shape: the times only mean something next to each other. Each card here keeps its own laps, so you can take a split on lane 2 without touching lane 3, and the export puts them in one file — a row per stopwatch, a column per lap — so the comparison survives the trip into a spreadsheet.
Swimming and track. One watch per lane or per athlete, named and coloured, with splits taken independently.
Classroom stations. One per group, so you can see which station is running long without stopping the others.
Cooking. Several things that went in at different times and come out at different times.
Interviews and debates. One watch per speaker, so total speaking time is a number rather than a guess.
Lab work. Parallel reactions started a minute apart, each with its own elapsed clock.
Timing one thing? The single stopwatch does more per session — fastest and slowest lap highlighting, a +/- column against the previous lap, a start delay, and a choice of display precision.
Naming and colouring the cards
Six dark cards in a grid are six identical dark cards, and "which one is lane 3?" is a question you should never have to ask in the middle of timing something. The palette button to the left of each name opens that card's settings: a name and a colour.
Eight preset colours cover most of what people actually match to — a team kit, a lane rope, the coloured card on a group's table — and the custom picker beside them takes any colour at all, so a card can be the exact shade of a shirt or a paint tin. Pick No colour to put a card back to plain. Names and colours are saved on your device with the rest of the session, and Reset all clears the times without clearing them.
The colour tints the card behind the display rather than flooding it: the read-out is a lit LED panel on a dark screen, and a pastel card would take the digits down with it. Colour is a label, not a status — a running card is still the one with the bright border.
What it can't do
These are browser stopwatches, and the limits are the browser's. A running stopwatch measures wall-clock time: it is the difference between the moment you pressed Start and the moment you are looking at it, so it keeps counting in a background tab and it keeps counting through a closed tab or a sleeping laptop. Come back the next morning and a watch you left running will read the whole night, because the whole night is what elapsed. Stop it before you close the tab if that is not what you want. Displayed precision varies by device.
Good enough for training, a classroom or a kitchen. Not calibrated equipment, and not suitable for official results. What a browser timer actually does, measured rather than described: how accurate is a browser timer?
How many stopwatches can I run at once?
6 on a computer and 3 on a phone. Each one keeps its own name, its own colour, its own elapsed time and its own laps, and they run completely independently — starting one does not touch the others. If you only need one, the single stopwatch has more per-session tools.
Why only three on a phone?
Because a phone showing 6 cards shows 6 read-outs too small to glance at, and glancing is the whole job. If you want them anyway — a phone held sideways, or a tablet the page has guessed wrong about — the layout button switches between the wide and narrow views and stays where you put it. Switching to the narrow view never stops or deletes a watch; it tells you how many fit and leaves your clocks running.
Do they all have to start together?
No, and that is the point — each card has its own Start. There is also a Start all button for a race where everyone goes on the same gun, and pressing it starts every stopped watch at the same instant rather than one after another.
Can I name them?
Yes — open the palette button to the left of the name and type, or just tap the name itself. Lane 3, Kettle, Group B, whatever you are actually timing. The names are saved with the session and appear in the exported file.
Can I give each stopwatch its own colour?
Yes. The palette button on each card sets its background colour: eight presets, or a custom picker for any colour at all, so a card can match a team kit, a lane rope or the paint on a wall. Colours are saved with the session, and there is a No colour option to put a card back to plain.
Are my times saved if I close the tab?
Yes. Every watch, its name, its colour and its laps are stored on your device. A watch that was running when you closed the tab is still running when you come back, and it will read the full wall-clock time since you pressed Start — the gap is counted, not skipped. Stop a watch before closing if you do not want that. Reset all clears the times; the names and colours stay.
Can I export them all at once?
Yes — CSV writes one file with a row per stopwatch: its name, then a column for each lap, then its total time. Six watches are six rows you can read down, and if nobody took a lap the file is simply each name and its time. Share does the same thing as a picture — one column per watch, in that watch's colour.
What are the exported files called?
The date and time you saved them, then the names of the cards you renamed: 2026-08-08-1615-lane-3-lane-4.csv. A board you did not rename falls back to stopwatch-times. That way a folder of exports sorts itself into the order you took them and no two ever overwrite each other.
Is it accurate enough for a race?
For training, a classroom or a kitchen, comfortably. It is not calibrated timing equipment and is not suitable for official results — displayed precision varies by device, and a background tab updates less often. The measured behaviour is on the browser timing page.
More timing tools
Single stopwatch · Timer (three countdowns at once) · Alarm clock · Using these in a classroom