Tap Tabata for the classic 20 seconds on, 10 seconds off for 8 rounds, or build your own. The screen turns green for work and blue for rest, so you can follow it from across the room.
Teaching? Our sister site has a classroom timer with a noise meter, student picker and seating charts.
Frequently asked questions
What is a Tabata workout?
Eight rounds of 20 seconds of all-out effort followed by 10 seconds of rest, four minutes in total.
Can I hear the timer over music?
Yes. The beeps are sharp tones designed to cut through music. Turn up your device volume for the best results.
Is TimerTab free?
Yes. Every clock, timer and alarm is free, with no account and no download. It works in any modern browser on desktop, phone or tablet.
Will it keep time if I switch tabs?
Yes. TimerTab counts from the real clock time instead of counting ticks, so it stays accurate when the tab is in the background and catches up instantly when you come back.
Does it work offline?
Yes. After your first visit the pages are cached on your device, so timers, the stopwatch and alarms keep working without an internet connection.