Metronome

A simple adjustable-tempo metronome that clicks at your chosen BPM (beats per minute) — for practicing music, pacing exercise, or any rhythm-based task.

The metronome is one of music's oldest pieces of external timing technology, formalized as a mechanical device in the early 1800s specifically so composers and performers could communicate an exact tempo rather than relying on vague instructions like "moderately fast," which meant something different to every musician who read them. Before that invention, tempo was largely a matter of interpretation and tradition; the metronome turned it into a specific, reproducible number.

What a metronome actually does is deceptively simple — click at a steady, unwavering interval — but that steadiness is the entire point. Human timing drifts naturally, speeding up during exciting passages and slowing during difficult ones, often without the performer noticing it happening in the moment. Practicing against a metronome's unwavering click is one of the most effective ways to train that drift out, which is why it remains standard practice for musicians well over two centuries after its invention, despite (or maybe because of) how unglamorous the tool itself is.

This version lets you set any tempo between 20 and 300 BPM, covering the full practical range from a very slow largo to a very fast presto, and clicks steadily at that rate until you stop it. Outside of music, the same steady-click mechanic works for pacing repetitive exercises, timed breathing practices, or anything else that benefits from an external, unwavering beat.

1. Set your desired BPM.
2. Press Start.
3. Press Stop when you're done.