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55
BU Score
Solid

Theory Lessons

4.4 ✍️ Editor
✍️ BU Analytics Review

Theory Lessons is an iOS app from musictheory.net in the Travel category, currently rated 4.4★ across 126 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.

Our BU Score puts it at 55Solid (established niche player). For a Travel app, that means established niche player.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

creator

📊 Performance Tracking LIVE

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idle
0%
Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
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since first record
Range:

💰 Forecast Revenue / mo

MODEL
Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 9 of 9 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
Paid app ($2.99)METRIC
+$2,800
5 starREVIEW
+$1,800
excellent appREVIEW
+$1,500
Mature app (14y old)METRIC
+$1,500
highly recommendREVIEW
+$1,400
slowREVIEW
−$1,200
Good rating (4.4★)METRIC
+$800
Early-stage install base (126 ratings)METRIC
+$400
Single-language (English only)METRIC
−$400
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📈 Reviews Growth

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jun 24
Dec 24
Oct 25

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 4 MB🔞 4+📱 iOS 15.8+🔖 v3.2.1🔄 updated 3w ago🌐 EN📂 Travel💰 Paid🚀 Launched 2012 (14y old)

📝 About this app

Theory Lessons features 39 music theory lessons from musictheory.net, presented in their original animated versions.

Complete lesson list:

• The Staff, Clefs, and Ledger Lines
• Note Duration
• Measures and Time Signature
• Rest Duration
• Dots and Ties
• Steps and Accidentals

• Simple and Compound Meter
• Odd Meter

• The Major Scale
• The Minor Scales
• Scale Degrees
• Key Signatures
• Key Signature Calculation

• Generic Intervals
• Specific Intervals
• Writing Intervals
• Interval Inversion

• Introduction to Chords
• Triad Inversion
• Seventh Chords
• More Seventh Chords
• Seventh Chord Inversion

• Diatonic Triads
• Roman Numeral Analysis: Triads
• Diatonic Seventh Chords
• Roman Numeral Analysis: Seventh Chords
• Composing with Minor Scales
• Voicing Chords
• Analysis: O Canada

• Nonharmonic Tones
• Phrases and Cadences
• Circle Progressions
• Common Chord Progressions
• Triads in First Inversion
• Triads in Second Inversion
• Analysis: Auld Lang Syne

• Building Neapolitan Chords
• Using Neapolitan Chords
• Analysis: Moonlight Sonata

🆕 What's New · v3.2.1

- Fixes an issue where opening a link to a lesson could fail.
- Updates the app icon used in Dark, Clear, or Tinted modes.
- Fixes an issue where the wrong image would show in "The Staff, Clefs, and Ledger Lines".
- Corrects typographical errors in "The Minor Scales", "Diatonic Seventh Chords", and "Roman Numeral Analysis: Seventh Chords".

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name
Theory Lessons
Developer
musictheory.net
Bundle ID
net.musictheory.TheoryLessons
App Store URL
Open in App Store
Category
Travel
Content rating
4+
Languages
EN

Company

Website
www.musictheory.net
Tagline
Not found
Description
Introductory and intermediate music theory lessons, exercises, ear trainers, and calculators.
Founded
Not found
HQ / Address
Not found
Employees
Not found
Logo
OG image

Revenue

Verified revenue / mo
Not found
AI revenue estimate / mo
Not found
AI annual estimate
Not found
ML model estimate / mo
$373/mo
Top-grossing rank
Outside top 100 in US Travel
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
Not found
LinkedIn
Not found
GitHub
Not found
X followers
Not found
Public statements
Not found

Funding

Total raised
Not found
Last round
Not found
Investors
Not found
Crunchbase
Not found
AngelList
Not found

Press & Links

Articles found
Not found
Listed on
Not found
Blog
https://www.musictheory.net/news
Press / News
Not found

Contacts & Socials

Socials
Not found
Email
Not found
Phone
Not found
Contact page
https://www.musictheory.net/contact
About page
Not found
📈Ratings growth126 ratings+31% lifetimeShow 3-year history estimate ▾Feb 2015Jan 2021May 2026
Tracked (60 weeks) Pre-tracking estimate (36 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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