Chords. Scales. Tuner. Metronome.
A public reference for guitar players. Open data, open theory, open audio. No accounts. No paywall. No analytics. A small site that does four things and doesn’t ask anything in return.
Chord Library
39 fingerings · standard tuningOpen shapes, dominant and major sevenths, sus variants, power chords, and the common barre voicings. Filterable. Searchable.
Open →Scale Trainer
12 scales · full fretboardPick a root, pick a mode. The entire neck lights up — root in cyan, scale tones outlined. Modes from Ionian to Locrian, plus blues and pentatonics.
Open →Chromatic Tuner
Web Audio · YIN detectorIn-browser. Audio stays on your device. Sub-cent precision via parabolic interpolation on the YIN cumulative-mean-normalized difference.
Open →Metronome
Sample-accurate · tap tempoLookahead scheduler running on the audio thread. Drag the BPM, tap the tempo, or pick a time signature. Downbeat rings higher.
Open →Plain HTML.
Plain rights.
- IThe tools run on your machine. The tuner and metronome use Web Audio; nothing leaves the page.
- IIThe chord and scale data are TypeScript files in this repository. Read them, fork them, port them.
- IIINo sign-up, no email capture, no funnel. A reference works only if you can use it without trading anything.
◆ ProvenanceThe chord shapes, scale theory, and pitch-detection engine here are ported from Suede, the creator-ownership layer for AI-era music: proof of creation, programmable rights, and royalty routing for registered work. Built and maintained by Jason Colapietro.