libkeyfinder ☆

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Description:
Musical key detection for digital audio, GPL v3

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Multimedia

Tags: audio music c-plus-plus key-detection library

Install: brew install libkeyfinder

About:
Libkeyfinder is a C++ library designed for musical key detection from audio signals. It analyzes the harmonic content of digital audio to identify the musical key, supporting both standard and non-standard tuning systems. This provides a robust foundation for developers building DJ software, music analysis tools, or intelligent audio applications.

Key Features:

Fast and accurate key detection algorithm
Supports custom and non-standard tuning systems
C++ library with a simple, clean API
Handles chroma and BPS (Beatport) analysis methods

Use Cases:

Integrating key detection into DJ software for harmonic mixing
Building automated music library organization and tagging tools
Developing music recommendation systems based on harmonic compatibility
Creating musicology and music analysis applications

Alternatives:

aubio – A more comprehensive audio analysis library, but key detection is only one of many features.
Essentia – A large C++ library for audio analysis, often used for music information retrieval tasks.

Version History

Detected	Version	Rev	Change	Commit
Sep 14, 2025 2:52am		0	VERSION_BUMP	abf6a8a7