https://www.klangfreund.com/lufsmeter/
“A plugin to measure and adjust the loudness similar to the human perception of loudness. Compliant with EBU R 128, ATSC A/85 and more….”

Links
- FinalCutProX.Guru – Ben Balser’s website
- Klangfreund – LUFS Meter
- Wikipedia – LKFS (aka LUFS)