Key Changer

I built Key Changer, a pitch shifter for audio playing on supported websites in desktop Chrome. Singers can try a practice track in a more comfortable key, and musicians can shift recordings for play-along practice while tempo stays unchanged. It works beyond YouTube, including Spotify Web and SoundCloud. Pitch moves from -12 to +12 semitones, with -50 to +50 cents of fine tuning. The optional Keep vocals natural setting helps preserve vocal timbre. It runs on my proprietary WebAssembly engine and is currently free in early access.