Laps and splits
Mark each segment and see both the lap time and the running total.
Online Stopwatch
Time a session, record lap and split times, then copy the last 50 marks.
Duration
Phase
Focus
Round
1 / 4
Next
Break
Completed focus sessions and breaks will appear here.
Countdown to
Event countdown
00:05:00
Ready
Remaining
5 min 0 s
Elapsed
0 s
Ends around
--
Press Lap to record a lap.
More actions
Related tools
How to use the stopwatch
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Press Start when the activity begins. Press Pause to stop accumulating time, then Start to continue from the same elapsed time. Check the large display before recording a result.
Lap and split timing
Hundredths display
Shows elapsed time with two decimal places. Display resolution is separate from timing accuracy.
Copyable results
Copy a plain text summary of the last 50 marks, with lap durations and total elapsed times.
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Timestamp timing
Calculates elapsed time from the device clock when the page updates, rather than counting animation frames.
Start without installing
Use the stopwatch in a browser on your phone or computer.
Local lap storage
Settings and retained marks are saved in this browser, with no account required.
Frequently asked questions
How do I record laps and splits?
Press Lap while the stopwatch runs to mark the current time. Each entry shows the lap time for that segment and the total elapsed time, and the stopwatch keeps running without interruption.
What is the difference between a lap and a split?
A lap is the time for the current segment since your last mark. A split, or total, is the cumulative time from the start. The lap board shows both on every row so you can compare segments at a glance.
How precise is the stopwatch?
The display shows hundredths of a second, such as 00:01:12.34. That is display resolution, not a guarantee of accuracy within 0.01 seconds. Timing depends on the device clock, browser scheduling and when you press the controls.
Can I copy or save my lap times?
Copy creates a plain text summary of the last 50 marks, including each lap duration and its total elapsed time. Paste it into notes, a spreadsheet or a message. These marks are also saved in this browser, but clearing site data can remove them.
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Does the stopwatch keep running if I switch tabs?
Elapsed time is calculated from a start timestamp and the device clock. When you return to a hidden tab, the display updates using that elapsed time. A suspended page cannot capture lap marks, and changes to the system clock can affect the calculation.
What can I use the stopwatch for?
Time races and training intervals, cooking, study sessions, workouts, or anything where you want lap and split times. It works on phones and desktops.
Technical details
Timestamp calculations
Elapsed and remaining time are calculated from saved timestamps and the device clock, rather than counting display updates. Changing the system clock can affect the result. Hidden tabs and suspended devices can delay phase changes and alerts.
Local session storage
Mode settings and recoverable session state are saved in IndexedDB in this browser. Clearing site data or using temporary browser storage can remove them. Countdown links also contain the event details needed to reopen the shared card.
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Browser cues
Sound uses the browser’s audio API. Notifications require permission, and vibration depends on device support. There is no screen wake lock, so keep the device awake and the page open when you need timely cues.
Shared timing modes
Timer, Stopwatch, Countdown, Pomodoro, Interval and Meeting cost each have a dedicated page. They share a timer engine and local session storage, so switching between these pages can restore the saved state for each mode.