Norma 0.1.0

First public release of Norma, a macOS command-line tool for measuring and normalising audio loudness.

Features

• Measure integrated loudness, true peak and loudness range.
• Normalise files or folders to a chosen loudness target and true-peak ceiling. Defaults: −16 LUFS and −1 dBTP.
• Support WAV, FLAC, ALAC, AIFF, MP3 and AAC, with mono and stereo audio.
• Preserve or edit metadata and artwork using command-line options, CSV/JSON manifests or filename patterns.
• Preview changes, verify outputs and export CSV or JSON reports.
• Write new copies without modifying the original audio files. Norma never opens or imports into your Music library.

Requirements and installation

Requires macOS, Python 3.11+, FFmpeg and a matching ffprobe. FFmpeg is not bundled.

See the repository README for installation instructions. After installation, run norma --version and norma doctor.

Known limitations

• Apple Music 1.5.6.11 ignored the requested metadata in both tested WAV variants, despite the tags being present. This remains unresolved.
• Some low-sample-rate MP3 modes and demanding dynamic-processing cases have restrictions or may fail verification.
• Unsupported metadata is reported as a loss.
• Finder Quick Actions are not included.

See the README for the full limitations.

Licence

GPL-3.0-or-later. Copyright (C) 2026 dohmansfi.