APU Software APU Harmonic DJ 1.2.4
APU Harmonic DJ is a local-first DJ and harmonic mixing application from APU Software that analyzes music libraries by key, BPM, loudness, and ratings across six musical modes. It offers a Gem Finder for exploring and saving harmonic transitions, complete tracklist generation, keylocked mix support, and an interactive Mix Map, available as a standalone app or VST3/AU/AUv3/AAX plug-in on Mac.
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About APU Software APU Harmonic DJ 1.2.4 for Mac
APU Harmonic DJ is a local-first DJ software application developed by APU Software for analyzing music libraries, planning complete harmonic tracklists, auditioning transition candidates, and saving directed "Gems" — reusable harmonic transitions between tracks. Version 1.2.4 is confirmed directly on the official APU Software documentation site, following the app's significant 1.2.0 update released September 10, 2026, which introduced VST3, Audio Unit, AUv3, and AAX plug-in formats alongside a wave of mixing and library improvements. On Mac, Harmonic DJ is available both as a standalone application and as Audio Unit/AUv3/VST3/AAX plug-ins for Intel and Apple Silicon. What distinguishes Harmonic DJ from typical DJ software is its harmonic-mixing focus and local-first privacy model: rather than relying on a simplified Major/minor key system, it distinguishes between six musical modes — Ionian, Dorian, Phrygian, Lydian, Mixolydian, and Aeolian — for far more precise harmonic compatibility across a library. All audio analysis happens on the user's own computer, with no cloud upload of commercial tracks required. The Gem Finder tool lets DJs explore directed transition candidates with audio audition, while the app's tracklist generator can build complete, harmonically compatible sets with exact track counts, BPM and gain guidance, and support for keylocked mixes and an interactive Mix Map for both local and published sets.