Can I run multiple stopwatches at the same time?

Yes. Parallel mode allows every stopwatch to run simultaneously, which is ideal for races, assembly lines, or any workflow where several people or samples move together.

When should I use switch mode?

Switch mode automatically pauses the rest when you start one stopwatch, making it perfect for moderating speaking time, spotlighting one client task, or handling equipment that should never overlap.

How do keyboard hotkeys work?

Pick a number key or letter from the dropdown inside each card. When this tab is active, pressing that key toggles start or pause so you can keep your hands on the keyboard.

What do macro groups do?

Add stopwatches to group A, B, or C to trigger start/pause for an entire cohort. Coaches, moderators, and lab leads use this to move through scripts without clicking each stopwatch.

How are decimal hours calculated?

We divide elapsed seconds by 3600 and round to three decimals. That means 45 minutes becomes 0.750 hours and 1 hour 12 minutes becomes 1.200 hours - formats payroll teams expect.

Can I export or share my results?

Yes. Use the CSV or JSON exports for spreadsheets or dashboards. The share-link button packages your stopwatch names, colors, hotkeys, and groups so teammates can load the same board instantly.

Is my stopwatch data private?

Everything runs locally in your browser. We store the board in local storage so you can refresh the page, but nothing is uploaded to a server unless you export and share the files yourself.

Multiple Stopwatches | Parallel & Switch Mode Timers

Mode

Parallel mode keeps every stopwatch running together - perfect for tracking multiple athletes, workstations, or projects.

No stopwatches yet.

Create your first two stopwatches to track parallel projects, athletes, lab samples, or session roles. Each timer can carry a name, macro group, keyboard hotkey, and lap history.

Session overview

Total stopwatches

0

Running now

0

Combined elapsed

00:00:00

Decimal hours

0.000

Lap entries logged: 0 | Macro-ready shortcuts: Groups idle

CSV includes stopwatch name, group, hotkey, elapsed time, decimal hours, and lap summary.
JSON exports every lap entry, making it simple to replay a run inside scripts or dashboards.
Share links load stopwatch names, colors, groups, and hotkeys for collaborators.

Pro tips

Rename each stopwatch with a clear label so exports double as logbooks.
Assign macro groups to cohorts (like speakers or lab stations) to pause the right cluster instantly.
Switch mode is perfect for speaking-time moderation; only one stopwatch runs at once.
Export CSV after a run for payroll or share JSON with scripts that push updates to dashboards.
Use the shareable link to preload labels, colors, and hotkeys across team devices.

Why run multiple stopwatches

Single-stopwatch apps only cover one participant or one task. This dashboard keeps dozens of efforts visible at once, then translates everything to decimal hours so the recordings slide into timesheets, payroll summaries, or lab logs without extra math.

Track billable time across parallel client projects and copy decimal hours into invoicing tools.
Time every speaker on a panel or every person in a stand-up so the meeting flow stays balanced.
Assign timers to lab samples, quality checks, or assembly steps to surface process bottlenecks.
Capture each runner or lane during workouts, with laps proving interval consistency.

Because everything runs locally, the board keeps timing even when you switch tabs, lose Wi-Fi for a moment, or toss the dashboard into fullscreen view on a spare monitor.

Popular use cases

Sports & training

Parallel intervals and lap policing

Give each lane or athlete a dedicated stopwatch, use parallel mode for simultaneous heats, and rely on lap logs to compare best splits.

Panels & stand-ups

Switch mode for fair airtime

Assign a stopwatch to each speaker, toggle with hotkeys, and capture who used how much runtime for transparent retros.

Client & agency work

Billable decimal hours

Track every project or retainer thread all day, then export decimal-hour totals that paste directly into payroll or invoicing software.

Labs, QA, and manufacturing

Macro groups for workflows

Start or pause related workstations in a single click, log laps for each phase, and export timestamps for audit-ready documentation.

How the tool stays accurate

Every stopwatch uses the browser's high-resolution clock. When you hit Start we capture the timestamp, then update elapsed time each animation frame. Pausing stores the accumulated milliseconds, and resuming keeps stacking on top, so totals remain stable even when you switch tabs or let the window sleep for a moment.

Parallel mode runs every stopwatch simultaneously-perfect for tracking multiple athletes or workstations.
Switch mode enforces focus by pausing the rest whenever you start one stopwatch, great for meeting facilitation.
Hotkeys (1-9, Q, W, E, R, A, S, D, F) toggle individual timers without hunting for buttons.
Macro groups A, B, and C let you blast start/pause commands across related stopwatches in a single click.
Laps capture an exact timestamp, print the lap number, and append to exports for audit trails.
Decimal hours display with three decimal places so payroll formulas and client invoices stay clean.

Data lives in local storage only. Refresh the page or pin the tab and your stopwatches stay put until you reset them or clear your browser cache.

Multiple Stopwatches With Hotkeys & Decimal Hours