How to use the online timer
Interval sprints live or die on accurate timing, and 21 seconds is a common burst length whether you're doing suicides on the court or sprint efforts on the footpath. Tap start right before you take off, and let the sound tell you when to ease up instead of glancing at your watch mid-stride. It keeps every rep honest and stops the last few seconds turning into a guess.
There's nothing to configure beyond tapping the button: press Start and the numbers begin ticking down straight away. The tab needs to stay open in your browser for the whole stretch, since closing it or switching the computer off stops the count, though you're free to switch to another tab and come back later. A clear alarm sounds the moment it hits zero, loud enough to notice from another room.
A phone timer works fine until a call comes in or a notification steals the screen at the worst moment. Running it in a browser tab keeps it separate from all that, ticking away quietly in the background of your computer or phone without competing for attention until it's done. There's nothing to install and nothing to sign up for, just a page that does one job well. People type this as set timer 21 seconds or timer for 21 seconds; both land here and start the same count.
Common questions
Can I run more than one timer at once?
Yes, opening the page in separate tabs lets you track a few things at the same time, each counting down independently of the others.
Do I need to install anything to use the timer?
No. It runs straight in your browser, so there's nothing to download and no account to create.
Will the timer keep running if I close the tab?
No. Closing the tab or the browser stops the countdown, so leave it open until the timer finishes.
Can I use the timer on my phone?
Yes. It works in any mobile browser, though the tab still needs to stay open rather than sitting behind other apps for a reliable count.
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