Chord Analyzer

Chord Analyzer is a real-time MIDI chord detection and music theory analysis plugin — completely free.

Route MIDI to Chord Analyzer and instantly see what chord you're playing, its Roman numeral in your chosen key, and its harmonic function. Get intelligent suggestions for what chord to play next, from basic I-IV-V progressions to advanced chromatic mediants and Coltrane changes.

Feature Highlights:

• Chord Detection: Recognizes 45 chord types including triads, seventh chords, extended chords (9th, 11th, 13th), altered dominants, sus chords, and power chords. Detects inversions and displays slash notation.
• Music Theory Analysis: Set your key (any root, major or minor) and see Roman numeral analysis for every chord. Harmonic function labels (Tonic, Subdominant, Dominant, Borrowed, Chromatic) help you understand the role each chord plays.
• Chord Suggestions: Three tiers of suggestions based on your current chord:
  • Basic — Common progressions (I-IV-V, ii-V-I, vi-IV).
  • Intermediate — Secondary dominants, borrowed chords, tritone substitutions.
  • Advanced — Chromatic mediants, Neapolitan chords, augmented 6th approaches.
• Session Recording: Record your chord progressions with timing data and export as JSON for analysis, notation software, or further processing.
• Educational Tooltips: Hover over any element to learn about chord qualities, harmonic functions, and why certain progressions work.

Features:

• Real-time chord detection from MIDI input.
• 45 chord patterns (triads, 7ths, extended, altered, sus, add).
• Roman numeral analysis in any key (major and minor).
• Harmonic function labels (Tonic, Subdominant, Dominant).
• Inversion detection with slash notation.
• 3-tier chord suggestions: Basic, Intermediate, Advanced.
• Session recording with JSON export.
• Educational tooltips for music theory concepts.
• Resizable UI with persistent window size.