# Scales Lexicon vs IMSLP

The clearest difference is price: IMSLP at Free against Scales Lexicon's $2.99. IMSLP also leads on update cadence (every 10 days vs every 19 months) and ratings volume (515 vs 6). Scales Lexicon's advantage is in-app purchases (none vs 1) and rating (4.8 vs 4.6). On ads there is nothing between them.

IMSLP is free to download; Scales Lexicon costs $2.99 up front. IMSLP sells 1 in-app purchase, starting at $3.99 per month. Scales Lexicon asks for nothing beyond the download.

Scales Lexicon holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: IMSLP has 515 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 86% of Scales Lexicon's written reviews are positive against 70% of IMSLP's.

Scales Lexicon ships an update every 19 months, IMSLP every 10 days. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Scales Lexicon | IMSLP |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/scales-lexicon/id428590294/reviews)** | [4.6 (515 ratings)](https://appshunter.io/ios/app/imslp/id1373671782/reviews) |
| Number of ratings | 6 | **515** |
| Positive reviews | **85.7% of reviews** | 70.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 10 days** |
| Monetization | Paid | **Freemium** |
| Size | 40 MB | 232 MB |
| Requires iOS | 26.5 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Patrick Q. Kelly](https://appshunter.io/developer/310068987) | [Project Petrucci LLC](https://appshunter.io/developer/1373671781) |

## What reviewers say

### Scales Lexicon

[App page](https://appshunter.io/ios/app/scales-lexicon/id428590294)

This app provides a comprehensive library of musical scales with detailed notation and playback. It allows for transposition across various instruments and clefs, offering customizable rhythmic patterns and playback options. Users can generate printable PDF scores for practice and sharing.

**Highlights:** Over 100 musical scales, Interactive notation and playback, Transposition for multiple instruments, Customizable rhythmic patterns, PDF score generation, Multiple octaves and playback modes

**In-app purchases:** none


### IMSLP

[App page](https://appshunter.io/ios/app/imslp/id1373671782)

Access a vast digital library of classical music scores on your iOS device. Enjoy full access to commercial recordings, instant downloads, and new uploads with a membership subscription. Support the music community while exploring a comprehensive collection.

**Highlights:** Browse IMSLP/Petrucci Music Library, View musical scores, Access commercial recordings, Instant downloads, Access new uploads instantly, Membership subscription benefits

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Membership Subscription | $3.99 | per month |

**What reviewers like**

- 🚀 Integrated IMSLP library
- 👍 Well-made app
- 👍 Game changer for musicians
- 👍 Indispensable for professionals and amateurs
- 👍 Fantastic offering

**What reviewers complain about**

- 🐛 Crashes when zooming in and annotating
- 💰 Money grabbing with constant subscription prompts
- 🐛 Frequent crashes and freezes
- 🐛 Annotation issues and lost data
- 🐛 Battery drain on iPad

**Reported bugs**

- Crashes when opening scores
- Scores disappearing from library
- Login issues and lost data
- Incompatibility with older devices after updates
- Annotation issues causing loss of data

**Requested features**

- Predictive text for score annotations
- Ability to restore original zoom settings
- Metric to indicate device performance during page turns
- Folder-like organization system
- Color wheel and custom pen/highlighter options


## Frequently asked questions

### Is Scales Lexicon free?

Scales Lexicon costs $2.99, with no in-app purchases.

### Is IMSLP free?

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

### Which has better reviews, Scales Lexicon or IMSLP?

Scales Lexicon is rated higher. Scales Lexicon averages 4.8 out of 5 from 6 ratings, while IMSLP averages 4.6 from 515 ratings.

### Do Scales Lexicon or IMSLP have ads?

Neither Scales Lexicon nor IMSLP shows ads.

### Which is updated more often, Scales Lexicon or IMSLP?

Scales Lexicon ships an update every 19 months, and IMSLP every 10 days. Most recently, Scales Lexicon was updated on November 1, 2026 and IMSLP on November 2, 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.*