Music Theory by Justin Guitar Downloads & RevenueMusic Theory by Justin Guitar · App Store & Google Play
Music Theory by Justin Guitar by Musopia is on App Store and Google Play. Active Users (MAU & DAU), Downloads, rankings, keywords, revenue, and rating totals.
Music Theory by Justin Guitar update history & changes
Last change · 13 events since 6 Oct 2025Full timeline ↓📦iOSUpdated to version 1.1.0🆕AndroidFirst spotted by AppInsider📈iOSDropped out of every chart we track📈iOSEntered the top 100📦iOSUpdated to version 1.0.7📦AndroidVersion 1.0.7🆕iOSFirst spotted by AppInsider🆕iOSReleased on the App Store🆕AndroidReleased on Google Play
Full timeline · 13 events
- ✏️Music Theory by Justin Guitar: app got biggeriOS261 MB → 359 MB (+37%)
- 📦Music Theory by Justin Guitar updated to version 1.1.0iOSMeet Daily Practice—three quick fretboard rounds to keep your skills sharp, with stars to earn and reminders to keep you going.
We’ve also given lessons a fresh look, made progress easier to follow, and smoothed out exercises and pesky bugs.… more - 🆕Music Theory by Justin Guitar first spotted by AppInsiderAndroidUnited States (found via similar)
- 📈Music Theory by Justin Guitar dropped out of every chart we trackiOSLast seen 8 Oct
- 📈Music Theory by Justin Guitar entered the top 100iOSTop Grossing · Education · DE
- 📈Music Theory by Justin Guitar charting in a new countryiOSGermany
- ✏️Music Theory by Justin Guitar: app got smalleriOS335 MB → 261 MB (-22%)
- 📦Music Theory by Justin Guitar updated to version 1.0.7iOS- Fixed lesson and practice cards showing outdated stars, completion status, and high scores when returning to a page.
- Fixed lesson-based practice exercises, including Drag & Quiz and Drawing, failing to show their earned stars and completion status.
- Fixed stars remaining hidden after previously locked content becomes available.
- Fixed home-screen module progress failing to refresh immediately after completing a lesson.
- Fixed module completion calculations counting shared lessons and exercises more than once.
- Fixed total star counts double-counting progress saved for the same item as both a lesson and an exercise.
- Fixed EDA shape quizzes displaying missing fretboard notes or using the wrong fretboard layout.… more - 📦Music Theory by Justin Guitar version 1.0.7AndroidFixes for counting earned stars and some practices not being detected as done until the app was restarted.
- 🆕Music Theory by Justin Guitar first spotted by AppInsideriOS#59 in Top Grossing · Education · United Arab Emirates
- 📦Music Theory by Justin Guitar version 1.0.5iOSThis update includes general fixes and polish, including smoother tutorial guidance and more reliable account notifications.
- 🆕Music Theory by Justin Guitar released on the App StoreiOS
- 🆕Music Theory by Justin Guitar released on Google PlayAndroid
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
4.5 ★
285 ratings, both stores
Measured
App Store
App details
App ID
6747342863
Publisher
Musopia Oy
Publisher country
Finland
On the store since
Oct 2025
1 year on the store
Minimum OS
iOS 15.0+
iPhone 6s and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
359 MB
Also listed in
Music
Google Play
App details
App ID
net.musopia.theoryapp
Publisher
Musopia Oy
Publisher country
Finland
Content rating
Everyone
Music Theory by Justin Guitar downloads & installs
Both stores, worldwide. Bands are open; exact numbers are free with an account.
| Store | Downloads / day | Lifetime installs |
|---|---|---|
| App Store | – | 10k+ |
| Google Play | – | 10k+ Measured |
| Total | – | 10k+ Confidence |
How this is calculated
App Store: chart positions and rating growth per country, anchored on its own Android downloads; lifetime from ratings worldwide × installs per rating. Google Play: the daily change in its exact install count. The total adds every store.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend before Apple and Google take their fee.
| Store | Per day | Per month | Share |
|---|---|---|---|
| App Store | |||
| Google Play | |||
| Total | Confidence | 100% |
Business model: Ad-led
How Music Theory by Justin Guitar makes money: subscriptions, one-off purchases and ads.
In-app purchasesAds · 2 ad networks
One-off purchases
/mo
of revenue
Ads
/mo
of revenue
Where it ranks now
Both stores, across every country we track.
| Store | Best rank | Charting in | US Top Free | US Top Grossing |
|---|---|---|---|---|
| App Store | – | 0 of 30 countries | – | – |
| Google Play | – | 0 of 23 countries | – | – |
Full chart lists: App Store · Google Play.
Ratings
Both stores. Store data, measured.
| Store | Rating | Ratings |
|---|---|---|
| App Store | 4.9 ★ | 21 |
| Google Play | 4.5 ★ | 264 20 written reviews |
| Both stores | 4.5 ★ weighted by ratings | 285 |
About 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 [email protected]
*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 co
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 [email protected]
*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 co
Music Theory by Justin Guitar App Store
Not in any tracked top chart right now.
Updated 9 Nov 2026 · rankings refresh through the day
DeveloperMusopia
CategoryEducation
PriceFree
Released
Rating★ 4.9 (21)
Version1.1.0
Age rating4+
First seen by us
28 Sep 2026
28 Sep 2026Installs (est.)10k+ worldwide
Rating
4.9 ★
21 ratings
Measured
Music Theory by Justin Guitar on the App Store
App details
App ID
6747342863
Publisher
Musopia Oy
Publisher country
Finland
On the store since
Oct 2025
1 year on the store
Minimum OS
iOS 15.0+
iPhone 6s and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
359 MB
Also listed in
Music
Music Theory by Justin Guitar downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in Music Theory by Justin Guitar before Apple and Google take their fee.
How this is calculated
Not on any Top Grossing chart: monthly active users × spend per user for its category, measured on the charted apps nearest the bottom of the charts.
Business model: Ad-led
How Music Theory by Justin Guitar makes money: subscriptions, one-off purchases and ads.
In-app purchasesAds · 2 ad networks
One-off purchases
/mo
of revenue
Ads
/mo
of revenue
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
4.9 ★
21 ratings
Measured
Ratings
21
Measured
About 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 [email protected]
*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 co
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 [email protected]
*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 co
Latest updates
1.1.0
Meet Daily Practice—three quick fretboard rounds to keep your skills sharp, with stars to earn and reminders to keep you going.
We’ve also given lessons a fresh look, made progress easier to follow, and smoothed out exercises and pesky bugs.
1.0.7
- Fixed lesson and practice cards showing outdated stars, completion status, and high scores when returning to a page.
- Fixed lesson-based practice exercises, including Drag & Quiz and Drawing, failing to show their earned stars and completion status.
- Fixed stars remaining hidden after previously locked content becomes available.
- Fixed home-screen module progress failing to refresh immediately after completing a lesson.
- Fixed module completion calculations counting shared lessons and exercises more than once.
- Fixed total star counts double-counting progress saved for the same item as both a lesson and an exercise.
- Fixed EDA shape quizzes displaying missing fretboard notes or using the wrong fretboard layout.
1.0.5
This update includes general fixes and polish, including smoother tutorial guidance and more reliable account notifications.
Store changes
What Music Theory by Justin Guitar changed on its store page: name, icon, screenshots, price, size, languages, requirements.
App got bigger
261 MB → 359 MB (+37%)
App got smaller
335 MB → 261 MB (-22%)
More from Musopia
Music Theory by Justin Guitar Android
Not in a tracked Google Play top chart right now.
Updated 9 Nov 2026 · rankings refresh through the day
DeveloperMusopia
CategoryEducation
PriceFree
Released
Installs10k+
Rating★ 4.5 (264)
Updated
Content ratingEveryone
Rating
4.5 ★
264 ratings
Measured
Music Theory by Justin Guitar on Google Play
App details
App ID
net.musopia.theoryapp
Publisher
Musopia Oy
Publisher country
Finland
Content rating
Everyone
Music Theory by Justin Guitar downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in Music Theory by Justin Guitar before Apple and Google take their fee.
How this is calculated
Not on any Top Grossing chart: monthly active users × spend per user for its category, measured on the charted apps nearest the bottom of the charts.
Business model: Ad-led
How Music Theory by Justin Guitar makes money: subscriptions, one-off purchases and ads.
In-app purchasesAds · 2 ad networks
One-off purchases
/mo
of revenue
Ads
/mo
of revenue
Where it ranks on Google Play
Every top 200 chart it appears in across 23 countries.
| Country | Charts | Rank |
|---|---|---|
| Not in a Google Play top chart right now. | ||
Ratings
Google Play, worldwide.
Rating
4.5 ★
264 ratings
Measured
Ratings
264
Measured
Written reviews
20
Measured
About Music Theory by Justin Guitar
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 pu
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 pu
What's new in 1.0.7
Fixes for counting earned stars and some practices not being detected as done until the app was restarted.