FretboardIQ vs Thelonious
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FretboardIQ
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FretboardIQ is the ultimate tool for guitarists to master the fretboard. Visualize scales, shapes, and patterns across all 24 frets with an intuitive, interactive interface. FEATURES: • Interactive fretboard with all 24 frets • Major and Minor scales • Minor Pentatonic patterns • 5 CAGED shape positions for scales • Major Scale positions (7-note patterns) • Custom tuning support • Dark and light themes • Root note highlighting • Shape visualization with color coding Perfect for: - Learning guitar scales - Understanding the CAGED system - Practicing scale positions - Visualizing note relationships - Improving fretboard knowledge Whether you're a beginner learning your first scales or an advanced player mastering the fretboard, FretboardIQ provides a clear, visual way to understand guitar theory.
Thelonious
This app simplifies music theory with visual aids for keys, chords, and scales. It helps users understand harmony and apply concepts to real playing, including guitar-specific features.
- Visual layouts for keys, chords, and scales
- Diatonic chord and key relationship study
- Chord progressions and harmonic movement
- Guitar mode charts
- CAGED system material
- Relative minor and dominant chord learning
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Thelonious is a music theory app designed to help you understand keys, chords, scales, and harmony through clear, visual layouts. Explore major keys, review scale notes, and study diatonic chords in a format built for both learning and quick reference. Thelonious connects theory to real playing with chord progressions, guitar mode charts, and CAGED system material. Use Thelonious to: • Explore major keys and their scale notes • Understand diatonic chords and key relationships • Learn relative minor and dominant chords • Study chord progressions and harmonic movement • View guitar modes and CAGED chord charts Whether you’re learning the fundamentals or deepening your understanding of harmony, Thelonious makes music theory easier to read, understand, and apply.
Screenshots
Verdict
The clearest difference is iOS requirement: FretboardIQ at 13.0 against Thelonious's 15.1. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | FretboardIQ | Thelonious |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 27 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Cameron Rodriquez | Robert Natale |
In-app purchases
FretboardIQ
No in-app purchases
Thelonious
No in-app purchases









