App Intel

Music Theory by Justin Guitar

LiveMusopia3 apps · 3.2M installsEducationFreeIn-app purchases: $10.99 - $199.99 per itemnet.musopia.theoryapp

How Music Works: Unlock guitar fretboard, chords & scales with JustinGuitar

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Total installs
15,659
exact · Play shows 10,000+
Installs / day
0
since last crawl
Rating
4.5★
252 ratings · 19 reviews
Released
6 Oct 2025
1y ago
Last update
7 Oct 2026
v1.0.7 · 5d ago
Countries
—
not checked yet

Install history

exact counter from Google Play
15.3K16.5K17.6K18.8K20K10 Oct11 Oct12 Oct
15.3K16.5K17.6K18.8K20K10 Oct11 Oct12 Oct

Installs per day · last 90 days

00.30.50.8111 Oct12 Oct12 Oct11 Oct: 012 Oct: 0

Change timeline

No changes recorded yet. We compare every crawl with the previous one and list title, icon, screenshots, description, version, price and availability changes here.

Country availability

Availability has not been checked for this app yet. “Check all countries” looks the app up in about 140 Google Play storefronts and shows where it is live, listed but not installable, or missing — plus any country-specific (custom) store listings.

Top countries

Country data will be available soon.

We estimate where downloads come from using the app’s position in Google Play’s top charts in about 140 countries. This app is not in any chart we have collected yet; the estimate appears as soon as it is.

Top chart positions

Not in any tracked top chart.

App manifest

Read this app's manifest from Google Play: permissions, declared SDKs, components and AdMob app ID. Saved analysis appears here automatically.

Manifest analysis reads only the required APK ranges. Base APK downloads may need separate device splits to install.

Data safety

declared by the developer on Google Play
  • No data shared with third parties
  • Collects data Financial info, App activity and 2 others
  • Data is encrypted in transit
  • You can ask for your data to be deleted

This is the developer's own declaration, summarised from the Play listing. The permissions below show what the app is technically able to access.

Permissions

10 in 2 groups
1 Sensitive4 Notable5 Routine

What this app can do with your phone

  • Record sound using your phone's microphone
MicrophoneSensitive1

Access to your phone's microphone to record sound

  • Record sound using your phone's microphonerecord audio · RECORD_AUDIO
OtherNotable9

Access to miscellaneous device features that don't fit other categories

  • See Bluetooth settings and connect to paired devices like headphones, speakers or watchespair with Bluetooth devices · BLUETOOTH
  • Change volume and choose which speaker or headset plays soundchange your audio settings · MODIFY_AUDIO_SETTINGS
  • Start itself automatically as soon as your phone finishes turning onrun at startup · RECEIVE_BOOT_COMPLETED
  • Keep your phone's processor or screen from going to sleep, which can use more batteryprevent device from sleeping · WAKE_LOCK
  • Check whether you are online and whether you use Wi-Fi or mobile dataview network connections · ACCESS_NETWORK_STATE
  • Connect to the internet to load content and send datafull network access · INTERNET
  • Check with Google Play that you got this app legitimatelyGoogle Play license check · com.android.vending.CHECK_LICENSE
  • Read Google service settings stored on your deviceread Google service configuration · com.google.android.providers.gsf.permission.READ_GSERVICES
  • Receive push messages sent from the app's servers over the internetreceive data from Internet · com.google.android.c2dm.permission.RECEIVE

Sensitive = can reach personal data, location, camera/mic or act on your behalf. Notable = changes how your device behaves. Routine = normal for almost every app. Source: Google Play's permission list for all versions of this app.

Store listing

Full description
Tired of music theory lessons that feel boring or disconnected from real playing? This is the ultimate music theory app for guitar players who want to unlock the fretboard and make sense of the music they love. With the Music Theory by Justin Guitar app, you’ll finally understand how music works — and apply it immediately to level up your guitar playing. Unlike traditional courses, this app combines bite-sized guitar lessons with interactive fretboard exercises. No endless theory talk — just practical learning that connects directly to how to play guitar. Whether you play acoustic or electric guitar, Justin’s proven approach makes theory useful, fun, and motivating. 🔥 Why It Works for Guitarists • Learn how to play guitar with scales, chords, and progressions that make sense • See a pattern, play it instantly, and remember it forever • Connect keys, notes, and intervals directly to the guitar fretboard • Skip the textbooks and focus on guitar lessons that stick 🎯 What You’ll Accomplish • Stop feeling lost when people talk about keys, scales, and chord progressions • Learn songs by ear instead of relying only on tabs or chords • Memorize every note on the fretboard with the fretboard trainer • Recognize hidden chord and note patterns in the music you love • Jam with confidence instead of just following along • Write your own riffs and solos using solid music theory knowledge • Break through frustrating plateaus with a clear roadmap • Accelerate your progress by learning the language of music 🎸 Built for Guitar Players Every lesson happens on the guitar fretboard. You’ll explore fretboard navigation system (think CAGED, but better), barre chords, scales, ear training, chord progressions, and note patterns in a way that’s 100% relevant to guitarists. ⚡ Interactive Learning That Sticks • Quick lessons, quizzes, and exercises that build step by step • Fretboard and chord trainers with instant feedback • Practical ear training and recognition drills (coming soon) • Mobile learning at your own pace • Apply every concept immediately to your favorite songs 👨‍🏫 From the Teacher Millions Trust Justin Sandercoe — the teacher behind JustinGuitar and Justin Guitar lessons — has taught millions of players worldwide. His clear, encouraging teaching style has made Justin Mobile apps the go-to tools for guitarists of every level. Whether you’re picking up a guitar for the first time, stuck on a plateau, or ready to finally master theory, this app will give you the music theory foundation every guitarist needs. ✅ Download Music Theory by JustinGuitar today and turn music theory into your guitar superpower! We’d love to hear your feedback - email us at [email protected] *The lowest requirements for using the app on the Android device is Android 15 (API level 35) or higher 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 Google Play 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 Google Play 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

What's new

Fixes for counting earned stars and some practices not being detected as done until the app was restarted.

Growing in Education

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