Free audio tools
Measure loudness, check what streaming services will do to your master, and find a song’s tempo and key. Every tool runs in your browser: no upload, no account, no limit.
LUFS meter
Integrated, short-term and momentary loudness, loudness range and true peak, with a chart you can play along.
LUFS · LRA · dBTPOpen →Loudness penalty checker
How much Spotify, YouTube, Apple Music, Amazon Music, TIDAL and Deezer turn your track down, and a preview at that level.
Per-service gain in dBOpen →BPM and key finder
Tempo, musical key and Camelot code for any song file. No upload and no daily limit.
BPM · key · CamelotOpen →
Why they run in your browser
Unreleased music is private. These tools open the file on your own computer or phone and do all the maths there, so nothing is uploaded, stored or seen by anyone, and there is nothing to wait for in a queue.
It also means there is no usage limit. Measure every bounce of every mix as often as you like.
Measured it, now master it
Upload a mix and hear it mastered in about a minute. The preview is free and needs no account.