# Harmonic Analysis vs LessonKeeper

The clearest difference is review sentiment: LessonKeeper at 100% against Harmonic Analysis's 50%. LessonKeeper also leads on rating (5.0 vs 4.8) and device support (4 vs 1). Harmonic Analysis's advantage is update cadence (every 2 days vs every 2 weeks) and ratings volume (22 vs 3). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Harmonic Analysis sells 3 in-app purchases, starting at $3.99 per month and LessonKeeper sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

LessonKeeper holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Harmonic Analysis has 22 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 50% of Harmonic Analysis's written reviews are positive against 100% of LessonKeeper's.

Harmonic Analysis ships an update every 2 days, LessonKeeper every 2 weeks. The most recent releases landed on September 18, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Harmonic Analysis | LessonKeeper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (22 ratings)](https://appshunter.io/ios/app/harmonic-analysis-theory/id1366920484/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/lessonkeeper/id1508829201/reviews)** |
| Number of ratings | **22** | 3 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 2 weeks |
| Monetization | Freemium | Freemium |
| Size | 84 MB | 11 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Deeryard LLC](https://appshunter.io/developer/966765345) | [John Nastos](https://appshunter.io/developer/422681741) |

## What reviewers say

### Harmonic Analysis

[App page](https://appshunter.io/ios/app/harmonic-analysis-theory/id1366920484)

Master music theory with interactive exercises focused on chord and Roman numeral analysis. Practice constructing chords, analyzing progressions, and improving your musical ear through various training modes and customizable settings.

**Highlights:** Chord to Roman numeral training, Chord construction exercises, Chord construction with keyboard, Chord progression analysis, Selectable difficulty levels, Support for inverted chords, Performance reports

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access Monthly | $3.99 | per month |
| Premium Access Yearly | $39.99 | per year |
| One-time Payment | $159.99 | one-time |


### LessonKeeper

[App page](https://appshunter.io/ios/app/lessonkeeper/id1508829201)

Create and share engaging lessons with students using rich media like text, images, audio, and video. Students can access lessons via a web link without needing the app. Track student progress, manage payments, and sync data across devices.

**Highlights:** Create multimedia-rich lessons, Share lessons via web link, Real-time lesson edits, Student progress tracking, Payment and invoice management, Cross-device data sync, Export lesson data to CSV

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $7.99 | per month |
| Yearly Subscription | $79.99 | per year |


## Frequently asked questions

### Is Harmonic Analysis free?

Harmonic Analysis is free to download, with in-app purchases available.

### Is LessonKeeper free?

LessonKeeper is free to download, with in-app purchases available.

### Which has better reviews, Harmonic Analysis or LessonKeeper?

LessonKeeper is rated higher. Harmonic Analysis averages 4.8 out of 5 from 22 ratings, while LessonKeeper averages 5.0 from 3 ratings.

### Do Harmonic Analysis or LessonKeeper have ads?

Neither Harmonic Analysis nor LessonKeeper shows ads.

### Which is updated more often, Harmonic Analysis or LessonKeeper?

Harmonic Analysis ships an update every 2 days, and LessonKeeper every 2 weeks. Most recently, Harmonic Analysis was updated on September 18, 2026 and LessonKeeper on September 22, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*