BPM and key finder
Drop in a beat to find its tempo and key. Works with MP3, WAV and most other audio files.
This is a basic version of what’s in the Audia app, which reads the tempo and key of every beat you add and fills them in for you.
No file to hand? Tap along with the tempo tapper instead.
A free tool for producers. It runs in your browser, part of Audia’s way of giving back to the producer community.
Audia reads the tempo and key of every beat it uploads, writes the title, description and tags, and posts it to YouTube, BeatStars, SoundCloud and Airbit.
How it works
For the tempo, it finds where the drums and notes hit, then tests every tempo from 80 to 170 BPM to see which one they line up with. It also shows the half-time or double-time tempo, since a beat at 140 can also be counted at 70.
For the key, it measures which notes are loudest across the beat and compares them with the shape of a minor key. It names every key as a minor. If your beat is in a major key, it shows the relative minor, which uses the same notes: C major shows as A minor.
It’s a basic version, so on some beats it picks a key a fifth away, which is why it shows the next closest key too. In the Audia app, beats with the BPM and key in the file name are read straight from the name.