Music Theory by Justin Guitar
Music Theory by Justin Guitar

This page is not an official page of the app or its developer, but an independent editorial publication created for informational and commentary purposes. Unless expressly stated otherwise, neither the app nor its developer is affiliated with, endorsed by, sponsored by, authorized by, or otherwise officially connected with MWM, Apple, Google Play, the app publisher, or the app's developer, and nothing on this page implies that the app was developed using MWM's services. Any trademarks, logos, screenshots, and other content remain the property of their respective owners.

Logo of Music Theory by Justin Guitar

Music Theory by Justin Guitar

Stop feeling lost and start playing with confidence. Master practical music theory directly on your fretboard through interactive lessons from the teacher millions trust.

Key Figures

Downloads

500+

User Rating

4.6/5

Total Ratings

200

Publisher

Musopia Oy

Category

Education

Locales

1

Latest Version

0.3.2

Size

196.6 MB

First Released

Oct 7, 2025
Features

Unlock Your Guitar Superpowers

Ditch the boring textbooks. Master music theory through interactive, fretboard-first lessons designed specifically for guitarists by the world’s most trusted teacher.

Fretboard-First Learning

No confusing piano diagrams or abstract notation. Learn theory directly on the neck of your guitar so you can apply it to your playing instantly.

Break Your Playing Plateau

Stop feeling lost during jams or when writing riffs. Understand keys, scales, and progressions to transform from a tab-follower into a confident musician.

The following screenshots and description are sourced directly from the app's official store listing and are the property of the app developer.

App Store

Screenshots

Music Theory by Justin Guitar - Justin Sandercoe pointing to text that says How Music Works on a yellow and pink background

Justin Sandercoe pointing to text that says How Music Works on a yellow and pink background

Music Theory by Justin Guitar - Justin Guitar Music Theory app showing foundational guitar lessons for notes and chords.

Justin Guitar Music Theory app showing foundational guitar lessons for notes and chords.

Music Theory by Justin Guitar - Interface of the Music Theory by Justin Guitar app showing structured lesson modules for learning musical notes and the fretboard

Interface of the Music Theory by Justin Guitar app showing structured lesson modules for learning musical notes and the fretboard

Music Theory by Justin Guitar - Screenshot of the Music Theory by Justin Guitar app showing instructor Justin Sandercoe with the headline Play Smarter With Justin

Screenshot of the Music Theory by Justin Guitar app showing instructor Justin Sandercoe with the headline Play Smarter With Justin

Music Theory by Justin Guitar - A smartphone showing the Music Theory by Justin Guitar app with an interactive guitar fretboard and note circle for music theory lessons.

A smartphone showing the Music Theory by Justin Guitar app with an interactive guitar fretboard and note circle for music theory lessons.

Music Theory by Justin Guitar - A smartphone displaying an interactive music theory lesson from the Justin Guitar app with a circular diagram of musical notes.

A smartphone displaying an interactive music theory lesson from the Justin Guitar app with a circular diagram of musical notes.

Music Theory by Justin Guitar - A guitar lesson screen in the Music Theory by Justin Guitar app showing two different ways to play the B minor chord on a fretboard

A guitar lesson screen in the Music Theory by Justin Guitar app showing two different ways to play the B minor chord on a fretboard

Music Theory by Justin Guitar - A mobile app screen showing a music theory quiz question about guitar tuning with a correct answer selected and positive feedback.

A mobile app screen showing a music theory quiz question about guitar tuning with a correct answer selected and positive feedback.

Description

Tired of theory lessons that put you to sleep? Welcome to the app that turns music theory into a guitar superpower! The Music Theory by JustinGuitar app utilizes Justin's proven guitar-first approach to transform complex theory into practical playing skills. Finally understand music the way that actually makes sense for guitarists. Unlike traditional theory courses that leave you drowning in abstract concepts, this app gets you playing immediately. Every lesson combines bite-sized theory with hands-on fretboard exercises. No passive watching - this is active learning that sticks. Why This Changes Everything: Skip the hours of videos and textbooks. Work through interactive lessons that take you straight to the practical stuff. See a pattern, play it instantly and understand it forever. It's the most efficient way to finally "get" music theory as a guitar player. This knowledge will supercharge your motivation as you unlock new levels in your playing. What You'll Accomplish: • Stop feeling lost when people talk about keys, scales, notes, and chord progressions • Learn songs by ear instead of relying on tabs • Memorize and find any chord/note on the fretboard instantly • Recognize the patterns hiding in every song you love • Join jams with confidence instead of just following along • Create your own music and write killer riffs because you understand what makes them work • Break through that frustrating plateau you've been stuck on • Accelerate your learning by knowing the language of music Built Purposefully for Guitarists: Everything happens on the fretboard where you actually play. No confusing piano diagrams or abstract notation, it’s music theory you can use immediately. Interactive Learning That Sticks: • Quick exercises that build on each other systematically • Fretboard trainer that helps you memorize essential notes and chords • Immediate feedback so you know you're getting it right • Learn at your own pace without getting overwhelmed • Apply new concepts instantly to the music you love From the Teacher Millions Trust: Justin Sandercoe has taught millions of guitarists worldwide through his legendary JustinGuitar platform. His clear, encouraging teaching style has helped everyone from absolute beginners to touring professionals unlock their potential. Ready to finally understand the music you love? Download the app and transform from stuck to unstoppable today! We’d love to hear your feedback - email us at music.theory.ios.feedback@musopia.net *The lowest requirements for using the app on the i Phone are: - iPhone 6S (2015) - iPad (5th generation, 2017) - iPad mini (4th generation, 2015) - iPad Air (2nd generation, 2014) - iPad Pro (2015) -iOS 15 or newer *Not optimized for PC or Mac Important subscription information Justin Guitar offers several FULL ACCESS subscription packages that unlock unlimited access to all the published stages. Subscription purchases are charged to your iTunes account upon confirmation of the purchase. All subscriptions will AUTOMATICALLY be renewed unless the auto-renew is turned off at least 24 hours prior to the end of the current period. Your iTunes account will be charged a normal subscription price of the original subscription within 24 hours prior to the end of the current period. You can manage your subscriptions and turn off auto-renew by going to your Account Settings after the purchase. Subscriptions are non-refundable and may not be cancelled during an active subscription period. Our privacy policy can be found at https://www.musopia.net/privacy/ Terms of use: https://musopia.net/terms

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This page is not an official page of the app or its developer, but an independent editorial publication created for informational and commentary purposes. Unless expressly stated otherwise, neither the app nor its developer is affiliated with, endorsed by, sponsored by, authorized by, or otherwise officially connected with MWM, Apple, Google Play, the app publisher, or the app's developer, and nothing on this page implies that the app was developed using MWM's services. Any trademarks, logos, screenshots, and other content remain the property of their respective owners.