Youlean Loudness Meter

Youlean Loudness Meter is a free audio plugin available in VST, AU, and AAX formats for macOS (and Windows) that measures perceived loudness using standards such as LU, LUFS, LKFS, LRA, and PLR. It provides accurate metering for compliance with broadcast and streaming requirements, supporting regulations like ITU‑R BS.1770‑4, EBU R128, ATSC A/85, and others. The interface includes a dynamics graph, resizable GUI, and options for light or dark themes, with the ability to export measurements as PDF, PNG, or SVG.

The tool is aimed at audio engineers, producers, and post‑production professionals who need to ensure their mixes meet the loudness specifications of film, TV, gaming, and major streaming services such as Spotify, YouTube, Apple Music, Netflix, and Disney+. It offers preset configurations for various standards and platforms, as well as custom presets and A/B comparison states.

Distinctive aspects include its free price point, recognition as the 2016 KVR Developer Challenge winner, and a feature set that rivals commercial metering solutions, including drag‑and‑drop workflow, export capabilities, and a tutorial explaining the underlying measurements.