What is Stopwatch?
Start, lap, stop, reset — with a big display and millisecond precision. Press Space to start and stop, L to record a lap, and see your laps listed with the fastest highlighted. Fullscreen turns any screen into a sports-day clock.
Handy for races and drills, science experiments, timing speeches and seeing who really can hold a plank longest.
Game setup
Players1+
You needNothing — just this screen
SpaceAnywhere
TimeAny
Energy🧘 Calm
Where🏠🌳 Indoors or outdoors
GoalKeep time
How to play Stopwatch
- Pick a preset or type a custom time.
- Press Start. The big digits and progress ring count down; sound plays when time is up (if sound is on).
- Pause, resume or reset at any time. ESC exits fullscreen.
- Use ⛶ Fullscreen to fill a classroom board or TV.
How many players?
Stopwatch works with 1+ players and a typical round takes about Any. Recommended age: All ages.
Best occasions
Sports and drillsScience experimentsSpeech practiceChallenges
Tips
- Keep sound on for the end-of-time alarm — it is short and clear.
- Add a title (e.g. "Reading time") so everyone knows what the timer is for.
Stopwatch FAQ
Are there keyboard shortcuts?
Yes — Space starts and stops, L records a lap and R resets.
Does Stopwatch keep running in the background?
Yes — it uses real timestamps, so even if the tab is hidden the time is accurate when you return.
Is there an alarm sound?
Yes, a short generated alarm plays at zero when the site sound is on. Nothing autoplays before you press Start.