# Music Theory by Justin Guitar — Guitar Theory, Chords & Scales

> Guitar-focused music theory app with interactive fretboard exercises. (iPhone/iPad app by Musopia.)

- Source: https://appshunter.io/ios/app/music-theory-by-justin-guitar/id6747342863 (this page in markdown: same URL + `.md`)
- Developer: [Musopia](https://appshunter.io/developer/464674713)
- Category: Education, Music
- Price: Free with in-app purchases
- Rating: 4.80/5 from 355 App Store ratings · 33 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 231 MB
- Languages: American English
- Released: 2025-10-07
- Data updated: 2026-08-27
- Monetization: subscription
- User reviews in markdown: https://appshunter.io/ios/app/music-theory-by-justin-guitar/id6747342863/reviews.md

## What is Music Theory by Justin Guitar?

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

## Key features

- Guitar-first approach to theory
- Interactive fretboard exercises
- Practical application of concepts
- Fretboard trainer for note memorization
- Immediate feedback on progress
- Systematic, progressive lessons

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly subscription | $79.99 | per year |
| Yearly subscription | $79.99 | per year |
| Yearly subscription | $79.99 | per year |
| Monthly subscription | $9.99 | per month |


## Recent user reviews (10 of 33)

All indexed reviews: https://appshunter.io/ios/app/music-theory-by-justin-guitar/id6747342863/reviews.md

### 5/5 — Really helped!

*2026-07-14*

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.

### 5/5 — Relaxing way to learn

*2026-06-29*

I wanted to thank Justin and his team for teaching me so many things I wish I’d learned years ago. I have played guitar since I was a teenager - always felt that it was beyond me - maybe knock out a couple of standards at a pinch round a fire. I am working through Grade 2 on Justin Guitar currently and although I know the chords and so on the practical advice on technique and practice, combined with an entirely new understanding of the theory from the Music Theory app is making a 59 year old a substantially better guitarist. And I have really enjoyed the process - there is a level of calm that I appreciate in the presentation. I’ve jumped ahead for a taste of what is to come and gone back to revise what I need to consolidate. A completely brilliant full package for anyone who wants to properly make progress on guitar.

### 5/5 — Music Theory App Justin Guitar

*2026-06-05, version 0.8.2*

As with all Justin Guitar products, this is awesome and super useful!

### 5/5 — Best lessons I‘ve ever had. Easy learning. Great Job.

*2026-05-11*

Sabine

### 5/5 — Helpful!

*2026-04-30*

I am using the other Justin Guitar app for about 5 months and am making good progress. I know something about music but want to know more so I can play better.

### 5/5 — how many units are planned?

*2026-04-25*

and when is unit 4 comming?

### 1/5 — Expensive and unnecessary

*2026-04-19*

Good content, well presented by Justin and easy to follow, I learnt from the free content but could not see how this was worth the early access £45 asking price let alone the actual £80 asking!

There’s just not enough current content and I can’t see how they will justify the price.

Being subscription seems strange, It’s not something I’m going to come back to constantly.

Why isn’t it included as a module for the main Justin app if you wanted it? And why isn’t it a one off price?

Maybe if it was a one off bolt on for the main Justin app and much cheaper, £20? I’d gladly buy it but as it’s a separate app, not much content and unsure about future content, and so expensive it’s a pass.

### 5/5 — Excellent resource

*2026-04-19*

Justin’s music theory app is neatly organized into bite sized, easily digested sections with interactive quizzes that cement the precious learning ideas. After trying in vain to learn music theory I’ll never ever going back. Ever forward, Stephen.

### 5/5 — Mr Jay

*2026-04-15*

Outstanding so far

### 5/5 — Love it

*2026-03-26*

Awesome

## Frequently asked questions about Music Theory by Justin Guitar

### 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.

## Version history (last 5 releases)

### 0.9.1 — 2026-06-24

Improvements: Under-the-hood updates to our subscription and redemption systems for a smoother experience.
Bug Fixes:
Fixed an issue that could cause the app to crash when opening certain redemption links.
Resolved a visual bug where the close button was missing from certain screens.

### 0.9.0 — 2026-06-16

This update focuses entirely on stability improvements and under-the-hood bug fixes to ensure a smoother experience.

### 0.8.2 — 2026-06-03

This update focuses entirely on stability improvements and under-the-hood bug fixes to ensure a smoother experience.

### 0.8.1 — 2026-05-28

Fixed: Resolved an issue where note samples would occasionally fail to play during lessons.

### 0.8.0 — 2026-05-22

New Content in Unit 4: You can now explore and complete Lessons 1, 2, and 3.
Fresh Exercises in Unit 3: We’ve added new exercises to help you practice and master the material.

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## More apps by Musopia

- [FourChords Guitar Songbook](https://appshunter.io/ios/app/fourchords-guitar-songbook/id537151075)
- [Ukulele Karaoke and Tuner](https://appshunter.io/ios/app/ukulele-karaoke-and-tuner/id887760236)
- [Ukulele Tuner & Lessons: Kala](https://appshunter.io/ios/app/ukulele-tuner-and-lessons-kala/id1064893690)
- [Justin Guitar Lessons & Songs](https://appshunter.io/ios/app/justin-guitar-lessons-and-songs/id1176125504)
- [Rhythm Train - Music Tap Game](https://appshunter.io/ios/app/rhythm-train-music-tap-game/id6467633388)

All apps by Musopia: https://appshunter.io/developer/464674713

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*