Online Metronome

Practising at a steady tempo is the difference between playing a passage and playing it in time, and the physical metronome is never where you left it. Type a BPM here, hit the start/stop button, and you get a four-beat cycle: beat one is a higher click at 880 Hz and the other three are lower at 440 Hz, with a dot on screen that fills and empties along with the pulse.

The sound is not a file. Each click is an oscillator generated on the spot by the Web Audio API, lasting 60 milliseconds. The field accepts 30 to 240 BPM and clamps anything outside that; clear the field and it falls back to 60. Changing the BPM while it runs takes effect on the next beat, with no need to stop and start again. Timing comes from a JavaScript timer, which does the job but is not studio-accurate.

Keep the tab in the foreground: browsers throttle timers in background tabs and the tempo can slip. The accent always lands every four beats, so in triple metre, a waltz in 3/4, ignore the dot and count the one yourself, because there is no time signature or subdivision setting. To record against a click, use the metronome track in your audio software. Everything here runs in the browser.