Skip to content
Browser Screensaver

Interval Timer

Work, rest, repeat. The whole screen changes colour with the phase, so you can see where you are from the floor without looking for a number.

Press F for fullscreen, Esc to exit.

An interval timer you can read mid-set

When you are halfway through a set, reading a small number on a phone is exactly the thing you cannot do. The background colour here carries the phase — green for work, blue for rest — which is readable upside down, from across a room, and out of the corner of your eye.

Work and rest are set independently and go down to fifteen second increments, so a Tabata pattern of twenty seconds on and ten off is as easy to configure as a five minute circuit.

  • HIIT and circuit training
  • Tabata intervals
  • Timed practice sets — instrument, language, drills
  • Anything alternating effort and recovery on a fixed schedule

Configurations that stay configured

The work length, rest length and round count all live in the address bar. Your Tuesday circuit and your Thursday one are two different bookmarks, both ready without setting anything up.

The round counter shows where you are through the set, which is the other thing that becomes impossible to keep track of once you are tired.

Running it during a workout

Prop a phone or tablet where you can see it, press F for fullscreen, and press Start. The colour tells you the phase and the number tells you how long is left in it.

It is silent. Play whatever you were going to play anyway; the timer will not fight it.

Questions

Can I set a Tabata pattern?

Yes — twenty seconds work and ten seconds rest over eight rounds. The controls step in fifteen second increments, and the ?work= and ?rest= parameters accept any value in minutes.

Is there a beep between intervals?

No. Nothing on this site plays audio. The whole screen changes colour instead, which is more reliable mid-exercise than a sound competing with music.

Is the interval timer free?

Yes — free, no account, no download, no limit. It runs entirely in your browser, so it keeps working if the connection drops.

Does it make a sound when it finishes?

No. Nothing on this site plays audio. The screen changes colour and flashes instead, which is what works on a muted display at the front of a room — and it will not startle anyone.

Can I save my settings?

They are already saved — in the address bar. Every change is written into the URL, so bookmarking the page keeps the timer exactly as you configured it, and pasting the link gives someone else the same one.