Timmer is a sleek countdown timer that looks just like your kitchen timer but works in the borwser. You can rotate the dial to set the timer and it will make a little beep when the time is up.
Timerr has two modes – you can either set the Autostart mode on that will start the timer as soon as you rotate the knob or you can manually set and start the timer.
They also have a Chrome extension that works offline too. It cannot got any simpler.