ML revenue forecast.
Calibrated against 2499 apps in this category.
Confidence band
±15%
High — many comparable apps with verified data
At a glance
Earns 4.48× more than the category median (875/mo).
Ranks #298 of 2,499 in Travel (top 11.9% by revenue).
Launched Jan 17, 2012 · last updated Apr 21, 2026.
24 months of snapshot history tracked.
What the app looks like
Live screenshots from the App Store, captured by our snapshot worker. Tap any image to enlarge.
Theory Lessons's revenue trajectory
Forecast revenue from snapshot history. Last 24 months.
Where Theory Lessons sits in Travel
Revenue distribution of 2499 comparable apps. Theory Lessons highlighted.
Theory Lessons vs comparable apps
Revenue trajectory side-by-side. Bold = Theory Lessons, ghosted = peers.
App spec
Version
3.2.1
Last update
Apr 21, 2026
Launched
Jan 17, 2012
Min OS
15.8
Rating
4+
Price
$2.99
Monetization
Paid
Languages
EN
What Theory Lessons actually does (from App Store listing)
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 Inversi…
• 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".
Comparable iOS apps
The five apps in Travel with the closest revenue to Theory Lessons. Click any to see its detail page.
Each forecast combines App Store rating, ratings count, monetisation model, pricing tier, IAP signals and ad-supported flag.
The base estimate is then multiplied by a per-category scaling factor learned from apps with founder-verified MRR.
Every number on this page comes from public APIs and bumetric's own snapshot history.
Full methodology covers input variables, accuracy bands per category and how we treat apps without comparable anchors.
See also the live data on Theory Lessons's tracker page for current rating, reviews and snapshot timeline.
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