100 second timer
Press Start and an alarm will ring in exactly 100 seconds. Good for a short burst of focus, or a timed answer in a quiz game.
100 seconds is 100 seconds, or 3% of an hour. The timer keeps exact time in a background tab and shows the time left in the tab title. Press Space to pause, R to reset, F for full screen.
Other timers
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Set a custom timer · Stopwatch · Pomodoro timer · Classroom timer