Interval Timer
40s work · 20s rest · 8 rounds · no signup.
40s work · 20s rest · 8 rounds
An interval timer alternates timed work and rest periods for a set number of rounds — the backbone of HIIT, circuits, and Tabata. This one is preset to 40 seconds of work and 20 seconds of rest for 8 rounds, and it auto-advances with a chime at each switch.
The big flip clock is readable across the room, and a colour + label shows whether you're in a work or rest interval. Try the Tabata and HIIT presets below for other rhythms.
Tip: Set up before you start the clock — get into position so the first work interval isn't wasted fumbling with your phone.
Frequently asked questions
What is an interval timer?
A timer that alternates work and rest periods for a set number of rounds, used for HIIT, circuits, Tabata, and other interval training.
Is this interval timer free?
Yes, completely free with no signup. It runs in any browser.
Can I see it from across the room?
Yes — the fullscreen button makes the flip clock large and legible during a workout.
More interval timers
Want focus, meditation, and streaks too? Open the full FlipFocus app.