Solo dev builds free interactive guitar theory web app with Claude Code
Jon_Henderson_Music · reddit · 2026-11-15
A musician-developer released Fretbot, a free, no-signup web app that visualizes scales and chords on an interactive fretboard: it plays chord progressions, suggests fitting scales per chord with auto-scrolling, generates progressions from text prompts via Claude's API (Sonnet), and supports saving/looping.
Nearly all implementation was written by Claude Code — a single React file plus a Vercel serverless function. The author's strict workflow: diagnose the bug first, show the diff, then change the file. Claude also designed the harmony logic (finding the tonic, picking scales, spelling notes) and wrote theory exams validated with Opus. A paid Pro tier is planned.
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