Fun & games

Build an app that scores your singing against the original song

After a singing app filled up with cover versions, dsmurrell asked Claude Code to write code that listens to the song and to them and compares pitch, which became OnKey, an open-source app showing where they go off-key.

Agent(s): Claude Code
Source: Hacker News post (2026-10-22)
Verified: 2026-10-24

Try it yourself

Prompt idea: “Help me build a small app that listens to me sing along to [song] and shows, line by line, where my pitch drifts from the original. Start with the simplest version that runs on my computer.”