Comparison

Interval Matrix Pro vs Fretlight

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Interval Matrix Pro

Visualize music theory concepts like scales, chords, and intervals across various instruments. This app uses a unique color-coding system to make complex musical relationships intuitive and easy to understand, moving beyond rote memorization.

Highlights
  • Visual music theory for guitar, piano, bass, and more
  • Color-based system for intuitive understanding
  • See scales, chords, modes, and intervals
  • Supports custom tunings and instruments
  • Extensive scale and mode library
  • Designed by a music educator
Read full description

Interval Matrix Pro - Visual Music Theory for Guitar, Piano, Bass & More Stop memorizing shapes. Start seeing music. Interval Matrix Pro is a powerful visual music theory app for guitar, piano, bass, and multi-instrument musicians. Instantly see scales, chords, modes, and intervals across instruments using a unique color-based system that makes music theory intuitive, fast, and musical. Instead of dense theory books or memorized box patterns, Interval Matrix Pro uses a high-contrast 12-color interval matrix that reveals the geometry of music in real time. Your eyes navigate. Your ears create. Why Interval Matrix Pro Is Different Most music theory apps show notes. Interval Matrix Pro shows relationships. Inspired by advanced mental compartmentalization techniques used by legendary players, Interval Matrix Pro functions like a GPS for music theory and helps you: Instantly recognize interval function Visually understand tension and resolution Translate ideas between guitar, bass, piano, and other instruments Understand harmony without memorizing patterns This is music theory training, not rote memorization. Supported Instruments Guitar and Bass Guitar: 6-string, 7-string, and 8-string layouts Bass: 4-string, 5-string, and 6-string visualization Instantly translate shapes between guitar and bass Piano and Keyboard Full 88-key visualizer Clearly understand black-key and white-key relationships Ideal for composition, harmony, and ear training Orchestral and Folk Instruments Violin, Viola, Cello, Double Bass Banjo, Mandolin, Dulcimer, Ukulele World Instruments (Deep Vault) Sitar, Oud, Bouzouki, Balalaika, Charango Explore global harmony systems visually Total Customization (Advanced Mode) Build the instrument you actually play. Custom instruments and fretboards Custom tunings including Drop D, Open G, DADGAD, and more Interval toggling to isolate function Practice shell voicings Highlight only root, 3rd, and 7th Remove noise and focus on intent A Deep Theory Engine Over 146 scales including exotic, symmetrical, and authentic Indian ragas Accurate modal labeling including Dorian, Phrygian, Aeolian, Mixolydian, and more Smart color coding that helps you feel stability and tension before you play Built by a Music Educator Interval Matrix Pro was designed by a 30-year music educator and former guitar tech and student of Shawn Lane. The app is paired with a complete interval-based learning curriculum. Learn more at: https://www.bestguitarchannel.com/shawnlane Stop guessing. See the music. Enter the Matrix. Start your 3-Day Free Trial today. https://bestguitarchannel.com

About

Fretlight

Features
Read full description

Learn the guitar fretboard with focused drills, interactive theory, and practical tools for understanding notes, intervals, chords, modes, progressions, rhythm, and ear training. Fretlight is built for guitarists who want real fretboard fluency: knowing where the notes are, how music theory maps onto the neck, and why the shapes you play actually work. Instead of a video course or a subscription library, Fretlight gives you a clean practice space for building the skills you use every time you pick up the guitar. Practice with targeted drills: - Note Finder: learn every note on every string - Intervals: identify the distance between notes - Chord Builder: build chords from their interval formulas - Triad Builder: practice triads and inversions across the neck - Mode ID: recognize the 7 modes by their notes - Progressions: connect chords to scale degrees and harmonic function Use built-in tools: - Fretboard Explorer: tap the neck to hear and locate notes - Rhythm Trainer: strengthen your internal clock - Ear Training: identify notes by pitch - Metronome: practice with tap tempo and time signature control Study theory visually: - Modes - Chords - Keys - Triads - Circle of Fifths - CAGED System Every reference is designed around the guitar neck, with interactive fretboard diagrams and playable examples that help theory become something you can see, hear, and use. Customize the app for the way you play: - Standard, Drop D, D Standard, Open G, Open E, and DADGAD tunings - Left-handed mode - Reversible string order - Optional string numbers - Fretboard skins - Adjustable sound type - Haptic feedback - Daily practice reminders Fretlight is for beginners building their first reliable map of the fretboard, and for intermediate players who want chords, modes, triads, and progressions to feel less abstract. Open the app, choose a drill, and build the kind of fretboard knowledge that makes practice, improvisation, songwriting, and learning songs easier.

Screenshots

Interval Matrix Pro4 screens
Fretlight4 screens

Verdict

The call

The clearest difference is price: Interval Matrix Pro at Free against Fretlight's $3.99. Fretlight's advantage is in-app purchases (none vs 4). On update cadence, ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Interval Matrix Pro is free to download; Fretlight costs $3.99 up front. Interval Matrix Pro sells 4 in-app purchases, starting at $2.99 per 7 days. Fretlight asks for nothing beyond the download.

UpkeepUpdate frequency

Interval Matrix Pro ships an update weekly, Fretlight every 9 days. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

Scorecard2 real differences · 8 level
Interval Matrix Pro versus Fretlight: the parameters behind the verdict, then further details
ParameterInterval Matrix ProFretlight
PriceFree — better$3.99
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyWeekly — betterEvery 9 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size44 MB143 MB
Age rating9+4+
DeveloperJIMMY MICHAEL HUDSONSean Tollefsen Sinclair

In-app purchases

4 purchases

Interval Matrix Pro

Subscriptions3
  • Weekly3 Days trial$2.997 Days
  • Monthly Subscription3 Days trial$10.991 Month
  • Yearly Subscription3 Days trial$49.991 Year
One-time1
  • Lifetime$69.99
None

Fretlight

No in-app purchases

Questions

Is Interval Matrix Pro free?
Interval Matrix Pro is free to download, with in-app purchases available.
Is Fretlight free?
Fretlight costs $3.99, with no in-app purchases.
Do Interval Matrix Pro or Fretlight have ads?
Neither Interval Matrix Pro nor Fretlight shows ads.
Which is updated more often, Interval Matrix Pro or Fretlight?
Interval Matrix Pro ships an update weekly, and Fretlight every 9 days. Most recently, Interval Matrix Pro was updated on October 1, 2026 and Fretlight on October 14, 2026.

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