About ChordSpell

What is ChordSpell?

ChordSpell is a free, comprehensive music theory reference tool designed for musicians of every level. Whether you are a beginner learning your first chords, an intermediate player looking to understand scales and modes, or an advanced musician exploring complex harmony, ChordSpell provides instant, accurate answers directly in your browser with no downloads or sign-ups required.

At its core, ChordSpell is built around the idea that music theory should be accessible to everyone. Too often, theory resources are buried in dense textbooks or hidden behind paywalls. We wanted to create a tool that gives you the same information a university music theory course would, but in a format that is interactive, visual, and available whenever you need it.

What You Can Do

• Chord Identifier: Enter any combination of notes and instantly see matching chord names, symbols, intervals, and inversions. Our engine recognizes hundreds of chord types including triads, seventh chords, extended chords, altered chords, and slash chords.
• Scale Identifier: Enter notes to find matching scales and modes, complete with interval breakdowns, diatonic chords, and visual diagrams.
• Chord & Scale Reference: Browse our complete library of chord and scale pages, each with staff notation, piano keyboard diagrams, and guitar chord boxes or fretboard patterns.
• Chord Progression Generator: Explore common progressions like I-IV-V-I, ii-V-I, and I-V-vi-IV in any key, with diagrams for every chord in the progression.
• Audio Playback: Hear chords and scales played back using high-quality SoundFont synthesis, with piano, nylon guitar, and steel guitar timbres.
• Scale Comparison: Compare two scales side by side to see shared notes, differences, and interval relationships at a glance.
• Educational Articles: Read in-depth articles on music theory topics like intervals, inversions, chord progressions, and modes, written by experienced musicians.
• Multilingual Support: Available in English, Spanish, Portuguese, and Japanese, with localized note names, chord symbols, and scale labels.

How It Works

ChordSpell uses a custom-built music theory engine written entirely in TypeScript. When you enter notes into the Chord Identifier or Scale Identifier, the engine calculates every possible chord or scale match by analyzing the intervals between your selected notes. Results are ranked by likelihood and displayed with full interval breakdowns, inversions, and multiple diagram formats.

Every chord and scale page is generated from our comprehensive database of music theory data. Staff notation is rendered using the VexFlow music engraving library, piano keyboards are drawn as interactive SVGs, and guitar diagrams are computed algorithmically to show the most practical voicings. All of this happens in your browser with no server round-trips, so results are instantaneous.

Who Built ChordSpell

ChordSpell was created by a developer and musician with a degree in Music and years of experience as a music teacher. The project grew out of a simple frustration: existing chord reference tools were either too limited, too cluttered with ads, or lacked the depth needed for serious study.

The goal has always been to build the music theory reference tool that we wished existed when we were students. One that combines the rigor of a textbook with the convenience of a modern web app, and that treats users with respect by remaining free, fast, and focused on education.

Free & Ad-Supported

ChordSpell is completely free to use and always will be. The site is supported by non-intrusive advertising, which helps cover hosting and development costs. We believe music education tools should be accessible to everyone regardless of their budget, and advertising allows us to keep the tool available without charging users or limiting features behind a paywall.

For Educators and Students

If you are a music teacher, feel free to use ChordSpell as a classroom resource. The Chord Identifier and Scale Identifier make excellent demonstration tools for explaining how chords are constructed and how scales relate to harmony. Our educational articles can serve as supplementary reading for students studying music theory. If you have suggestions for how we can better serve educators, we would love to hear from you on our contact page.