Music Theory by Justin Guitar

Music Theory by Justin Guitar

Guitar Theory, Chords & Scales

376 ratings
37 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • October 7, 2025
  • September 11, 2026

Features

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About

This app transforms music theory into practical guitar skills through interactive lessons and fretboard exercises. Learn to understand keys, scales, and chords, and apply new concepts instantly to your playing. Accelerate your musical journey and break through learning plateaus.

Guitar-first approach to theory
Interactive fretboard exercises
Practical application of concepts
Fretboard trainer for note memorization
Immediate feedback on progress
Systematic, progressive lessons
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What's New in Music Theory by Justin Guitar

1.0.4

September 11, 2026

Fixed the continue button on some lesson slides.

Subscription plans

Yearly subscription

Unlock the theory course

$79.991 Year
1 Year trial
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Events

Read more about Unit 3 content released

Unit 3 content released

Keys, progression, creativity

Jan 29, 2026 Feb 27, 2026

User reviews

Amazing!

Im a self taught electric guitarist. I finally made myself find a real way to learn thats not just YouTube or by ear. I could only read tabs before lol and was honestly terrified of music theory and memorizing all the different chords but this made it super easy and simple to understand. Totally suggest this app.
PUNKS NOT DEAD!
GOD BLESS AMERICA
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Okay, but…

It prompted me twice in the last five minutes to leave a review. The first time I can ignore. The second was annoying and sorta ruined my learning session

Best of the Best

I study Justin’s material every day

Trash

The first lessons did not include playing at all, so one star

Really helped!

I’m taking Justin’s other class and decided that if I was really going to learn to play well, I needed to put in the hard work of understanding some music theory. I’m so glad I did. The course allowed me learn a bunch of concepts that I’ve either heard about and didn’t understand OR that I’ve never heard about before. The concepts take some work to really sink in and I can see myself coming back from time to time to refresh it in my head. Justin explains the ideas well - I just need to using them and applying them to my playing. Really happy I took this and stuck with it.
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Developer apps

FAQ

What does the Music Theory by Justin Guitar app do?

This app teaches music theory specifically for guitarists. It uses a guitar-first approach with interactive lessons and fretboard exercises to make complex theory practical and easy to understand for playing.

What are the key features of this app?

Key features include interactive lessons that combine bite-sized theory with hands-on fretboard exercises, a fretboard trainer to memorize notes and chords, and immediate feedback to ensure you're learning correctly. It focuses on practical application rather than abstract concepts.

How much does the Music Theory by Justin Guitar app cost?

The app offers full access through several subscription packages. These subscriptions unlock unlimited access to all published stages of the learning material.

What devices is this app compatible with?

The app is designed for iPhone and iPad. Minimum requirements include iPhone 6S or later, iPad (5th generation) or later, and iOS 15 or newer. It is not optimized for PC or Mac.

Who is this app best suited for?

This app is ideal for guitarists who want to move beyond just playing chords and tabs. It's for anyone who feels lost when discussing keys, scales, or chord progressions, and wants to understand the patterns in music to improve their playing, improvisation, and songwriting.