What is the difference between HIIT, Tabata, and EMOM?

Tabata is a specific protocol of 20 seconds of work and 10 seconds of rest for 8 rounds (4 minutes total). HIIT is a broader term for alternating hard work and recovery, commonly 30–45 seconds work and 15–30 seconds rest. EMOM ("every minute on the minute") runs back-to-back work rounds with no rest — set Rest to 0 in this timer to get EMOM behaviour.

Does the timer stay accurate if I switch tabs during a workout?

Yes. Remaining time is calculated every frame from a target timestamp using Date.now(), not by counting ticks, so browser background-tab throttling cannot desync the timer.

Why do I need to tap Sound on before I hear anything?

Browsers block audio until a page receives a user gesture. The Sound on button creates an AudioContext inside a click handler, which unlocks audio for the rest of the session.

Can I run the timer without any rest between rounds?

Yes. Set Rest to 0 and the timer will chain work rounds back-to-back with a short phase-change beep between each. This matches EMOM and continuous-circuit workout styles.

Is my workout configuration saved?

Not between visits — the timer is stateless and runs entirely in your browser. Bookmark the page and use the preset buttons for your favourite setups.

Interval Timer (HIIT)

Run work/rest intervals for HIIT, Tabata, and circuits. Audio cues on every phase change.

Get Ready · Round 1 of 8

00:00:10

Settings

Prep (sec)

Work (sec)

Rest (sec)

Rounds

Total workout: 00:05:55

Countdown Timer

Set a timer for any duration. Get an alert when time is up.

Stopwatch

Precise stopwatch with lap tracking and millisecond accuracy.

Timezone Converter

Convert times between any IANA timezones with DST awareness.

Pomodoro Timer

Work in focused intervals with automatic break scheduling.

World Clock

Track the current time in multiple cities at a glance.

Unix Timestamp Converter

Convert Unix epoch timestamps to dates and back, in seconds or milliseconds.

Age Calculator

Calculate exact age in years, months, days, hours, and seconds.

Date Calculator

Add or subtract from a date, or measure the duration between two dates.

Alarm Clock

Set multiple alarms with labels, audio, and desktop notifications.

Meeting Planner

Find the best meeting time across timezones on a 24-hour overlap grid.

Sunrise & Sunset

Calculate sunrise, sunset, twilight, and golden hour for any location.

Chess Clock

Two-player chess clock with Fischer increment and Bronstein delay.

Settings

More time tools