Comparison

Theory Lessons vs Sing Scales

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Theory Lessons

Explore 39 animated music theory lessons covering fundamental concepts like scales, chords, and intervals. Deepen your understanding of musical structure and analysis with this comprehensive resource.

Highlights
  • 39 animated music theory lessons
  • Covers staff, clefs, and ledger lines
  • Explains note and rest duration
  • Details major and minor scales
  • Teaches intervals and chord inversions
  • Includes Roman numeral analysis
  • Features musical analysis examples
Read full description

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

About

Sing Scales

Practice singing musical scales with a comprehensive library and interactive piano. Designed for beginners, it helps develop vocal control, ear training, and confidence. Master pitch and vocal flexibility through experimentation.

Highlights
  • Extensive scale library (100+ scales)
  • Configurable tempo and stepping patterns
  • Interactive piano keyboard
  • Designed for non-musicians
  • Solfège syllable practice
  • Ear training development
Features
Read full description

Practice the most fundamental yet creatively challenging art of singing musical scales. Voice training fine tunes the larynx and its vocal cords towards producing and sustaining consistent sound frequencies. Extensive scale library offers: — 100+ common scales — tempo setting — configurable scale stepping pattern BUILT FOR NON-MUSICIANS* The Sing Scales app is purposefully built with non-musicians in mind. The user interface is designed to present musical scales in an interactive manner. The user gradually acquires understanding through experimentation. The app doesn’t expect the user to have pre-existing knowledge of music theory. Singing scales is just one piano key tap away — make the lowest naturally comfortable “Do” sound, tap on the highlighted piano key and start singing the scale right away. It doesn’t have to be more complicated than that. * Musicians are welcome too, scales are for everyone! DOMAIN OF APPLICATION Singing musical scales is a foundational skill required to build one’s vocal and hearing faculties. The skill is immensely beneficial for a number of activities: – mastering the art of musical improvisation – ear training – self-development work on building confident and flexible voice – therapeutical applications that use voice work as the medium Ear training is a natural outcome of singing scales. Once one acquires the feeling of producing a certain pitch, a link to the hearing faculty is being established. WHY SING SCALES? What’s so unique about signing musical scales? Why not just learn to sing songs? It’s much easier to produce relative pitches than to be exact with one’s voice modulation. Learning to sing songs or whistling melodies is an exercise in relative perception. One can produce interesting results but foundational skill building would be missed. The true command of one’s voice and its connectedness to musical hearing begins from the ability to answer questions like: “What note am I voicing right now?” “How can I make a correct Fa pitch?” “What is the interval between the two notes I am hearing?” It’s a challenge worth pursuing! TECHNIQUE OVERVIEW The Sing Scales app is a flexible voice measurement tool. The user can practice singing solfège syllables of Do-Re-Mi-Fa-Sol-La-Ti or any sequence of syllables of choice. For example, singing a scale in La-La-La requires a superb tuning of one’s vocal cords. RICH LIBRARY OF MUSICAL SCALES The app comes with a significant library of more than 100 known scales. Each scale can be played back in any key. A piano keyboard is also provided for interactive scale exploration. The full list of provided scale classes is as follows: Major, Minor, Harmonic Minor, Melodic Minor, Natural Minor, Ionian, Aeolian, Dorian, Mixolydian, Phrygian, Ultraphrygian, Lydian, Locrian, Super Locrian, Chromatic, Whole, Altered, Augmented, Dominant 7th, Half Diminished, Leading Whole Tone, Diminished Whole Tone, Overtone, Nine Tone, Diatonic, Enigmatic, Double Harmonic, Auxiliary Diminished, Six Tone Symmetrical, Neopolitan, Prometheus, Pelog, Pentatonic Major, Jazz Melodic Minor, Spanish Gypsy, Eight Tone Spanish, Hungarian Major, Romanian Minor, Flamenco, Gypsy, Bebop Dominant, Chinese, Oriental, Hirajoshi, Ichikosucho, Kumoi, Yo, Iwato, Mongolian, Hindu, Byzantine, Arabian, Persian, Mohammedan, Maqam, Algerian, Balinese, Purvi Theta, Todi Theta, Tritone, Insen, Istrian, Pfluke, Ukrainian Dorian, Hawaiian, Man Gong, Ritsusen. NECESSARY TECHNICALITIES… Sections below will talk about how the app handles your data and will provide some essential online links. YOUR DATA The Sing Scales app does NOT collect any of your personal data. The app does NOT require an account creation. TERMS, CONDITIONS & PRIVACY For the terms and conditions please visit: https://seqfx.com/sing-scales-voice-training/tos For the privacy policy please visit: https://seqfx.com/sing-scales-voice-training/privacy

Screenshots

Theory Lessons4 screens
Sing Scales4 screens

Verdict

The call

The clearest difference is rating: Sing Scales at 5.0 against Theory Lessons's 4.4. Sing Scales also leads on review sentiment (100% vs 83%). Theory Lessons's advantage is ratings volume (127 vs 1) and price ($2.99 vs $5.99). On ads, in-app purchases and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Theory Lessons costs $2.99 and Sing Scales $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Sing Scales holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Theory Lessons has 127 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 83% of Theory Lessons's written reviews are positive against 100% of Sing Scales's.

UpkeepUpdate frequency

Theory Lessons ships an update every 4 months, Sing Scales every 9 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

Scorecard8 real differences · 3 level
Theory Lessons versus Sing Scales: the parameters behind the verdict, then further details
ParameterTheory LessonsSing Scales
Price$2.99 — better$5.99
Rating4.4 (127 ratings)5.0 (1 ratings) — better
Positive reviews83.1% of reviews100.0% of reviews — better
Number of ratings127 — better1
Update frequencyEvery 4 months — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank#12 — better—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.8 — better16.1
Further details — not scored
Size4 MB5 MB
Age rating4+4+
Developermusictheory.netSEQFX PTY LTD

Customer experience

Theory Lessons

All ratings126 ratings
Positive84.1%
Neutral7.9%
Negative7.9%
Written reviews154 reviews
Positive83.1%
Neutral5.8%
Negative11.0%

Sing Scales

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Theory Lessons

Reported bugs

2 issues
  • Directional arrows and guidance symbols not working on iPad
  • Text panels cut off at the bottom and unable to be resized

Requested features

4 requests
  • Add more advanced theory topics
  • Incorporate practice exercises and quizzes
  • Include support for other instruments beyond piano
  • Integrate with the Tenuto app for a more complete experience

Sing Scales

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Theory Lessons

No in-app purchases

None

Sing Scales

No in-app purchases

Questions

Is Theory Lessons free?
Theory Lessons costs $2.99, with no in-app purchases.
Is Sing Scales free?
Sing Scales costs $5.99, with no in-app purchases.
Which has better reviews, Theory Lessons or Sing Scales?
Sing Scales is rated higher. Theory Lessons averages 4.4 out of 5 from 127 ratings, while Sing Scales averages 5.0 from 1 ratings.
Do Theory Lessons or Sing Scales have ads?
Neither Theory Lessons nor Sing Scales shows ads.
Which is updated more often, Theory Lessons or Sing Scales?
Theory Lessons ships an update every 4 months, and Sing Scales every 9 months. Most recently, Theory Lessons was updated on November 6, 2026 and Sing Scales on November 7, 2026.

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