Atomic Afterglow – Local-first audio analysis (Librosa/Streamlit)

Show HN: Atomic Afterglow – Local-first audio analysis (Librosa/Streamlit)

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I got frustrated with existing DJ metadata tools acting as "black boxes"—uploading my audio to cloud servers and giving confident (but often wrong) key detection for minimal/tech-house tracks.So I built Atomic Afterglow. It’s a Python-based analyzer that runs in the browser but processes audio locally (zero retention/no uploads).How it works:Engine: Built on Librosa and Streamlit.Drop Detection: Instead of finding the "quietest" section, it uses a rolling RMS window to find the deepest structural energy trough in the middle 60% of the track (the breakdown/mix point).Harmonics: Uses the Krumhansl-Schmuckler algorithm to generate the Top 3 Key candidates (Camelot formatted) with confidence mar

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Website: atomic-afterglow.streamlit.app