LUFS Matrix

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LUFS Matrix by NovelSimple is a standalone loudness reference tool for macOS and Windows that lets producers, engineers, podcasters, and video creators hear exactly how their audio will sound after platform loudness normalization — before they upload.

Every major streaming and social platform normalizes audio to its own loudness target, which means a mix that sounds right in the DAW can sound noticeably different once it goes live. LUFS Matrix makes that difference audible in real time. Load an audio file, select a platform, and hear the adjusted playback instantly. A Loudness Match toggle lets you flip between the original and the platform-adjusted version while the track is playing.

Up to 4 audio files can be loaded simultaneously into slots A–D for time-synced A/B comparison. This makes it straightforward to check consistency across tracks, stems, or podcast episodes at the same platform standard. A "Quietest Loaded Track" reference mode is also available once 2 or more files are loaded, using the quietest file as a shared reference point.

Platforms covered: Spotify, Apple Music, YouTube, Instagram, Amazon Music, Deezer.

All processing is local — audio files are never uploaded or transmitted. Supports common audio and video formats. Drag and drop onto track slots is supported.

Features:

Real-time loudness-adjusted playback for 6 streaming platform targets.

Load and compare up to 4 tracks simultaneously, time-synced.

Loudness Match toggle — original vs. adjusted in one click.

"Quietest Loaded Track" reference mode (requires 2+ loaded tracks).

Drag and drop file loading.

Dark and light theme (preference saved).

Fully local processing — no audio upload, no account required for playback.

One-time purchase — use locally forever.

Platforms: Spotify, Apple Music, YouTube, Instagram, Amazon Music, Deezer.

macOS 11.4+ (Apple Silicon native), Windows 10+ (64-bit).