Press start and this timer counts down 90 minute, then sounds an alarm.
Type a number of hours, minutes and seconds — or tap a preset — and press Start. The timer counts down and sounds an alarm when it reaches zero, even if you switch tabs (the tab title shows the time left). Pause and resume anytime, or Reset to start over. Space starts/pauses; Full screen gives a big, across-the-room display.
Counting down to a date or event instead? Make a countdown. Need to time how long something takes? Use the stopwatch.