Aftertaste

A playlist is usually built from what a song is: its genre, its year, who else listened to it. Aftertaste is built from what a song leaves behind.

Name a track, or drop an audio file. The file is analysed in the browser with the Web Audio API — onset-based tempo, energy, brightness, acousticness — and never leaves the device. The seed becomes a five-dimensional profile matched to one of twelve archetypes, and candidate tracks are ranked by their distance from it, three per artist at most, each with a line saying why it made the cut.

Four sliders bend the target and re-rank instantly. Thirty-second previews play in a keyboard-accessible player; the full track opens on YouTube, Spotify or Apple Music. Keep it as a track list, an M3U, a CSV, or a link that restores the seed. A static site: no build step, no dependencies, no account.