Set a duration, hit start, get a beep at zero. The simplest timer here.
Get ready
0:10
Total: 12min
Keep this tab open and your screen on. Browsers suspend background tabs, so the beeps stop if you switch away. The app keeps running with the screen locked.
Same timer, with the screen off
The app keeps the clock and the beeps going when your phone locks. Free on iOS and Android.
Rest periods, mobility holds, a plank, a sauna, or anything where you just need to know when a fixed block of time is up. If you are running a workout with rounds, one of the other formats on this site will fit better.
One limit worth knowing before you start: a browser tab cannot make sound once your phone locks or you switch apps, because browsers suspend background tabs to save battery. For a workout where the phone sits in your pocket or face down on the floor, use the app instead. It keeps the clock and the beeps running with the screen off.
Yes, a triple beep, plus a countdown beep on each of the last three seconds. Your device volume needs to be up and you need to have pressed start, since browsers only allow audio after a user action.
Browsers suspend background tabs, so a web timer goes quiet the moment you switch apps. The Personal Records app keeps the clock and the beeps running with your phone in your pocket.
Free on iOS and Android. No account needed to start.