Show HN: Transposify–change Spotify song key from your menubar for singing

Category: other

Tags: audio, pitch-shift, macos, spotify, karaoke

Score: 7.0/10 (Innovation: 7, Technical: 8, Documentation: 7, Utility: 6)

Transposify is a macOS menu-bar app that captures Spotify's audio output via Core Audio process taps and shifts the pitch in real-time using the Rubber Band library, making it easier to sing along to songs in your vocal range. Its use of a muted process tap (macOS 14.4+) to intercept protected audio without virtual devices or kernel extensions is a clever technical approach. While niche for karaoke enthusiasts, the project demonstrates solid systems-level audio engineering.

Target audience: audio enthusiasts, musicians, karaoke fans

Repository: https://github.com/evanhu1/transposify · C++ · GPL-2.0 · 1 stars

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