# MEI vs Quick Theory

The clearest difference is in-app purchases: MEI at none against Quick Theory's 3. MEI also leads on iOS requirement (13.0 vs 18.0). Quick Theory's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Quick Theory sells 3 in-app purchases, starting at $4.99 per month. MEI asks for nothing beyond the download.

MEI ships an update every 2 months, Quick Theory every 3 weeks. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | MEI | Quick Theory |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 50 MB | 87 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alberto Acquilino](https://appshunter.io/developer/1698840914) | [HANOCH YOSEF LIB](https://appshunter.io/developer/6788600007) |

## What reviewers say

### MEI

[App page](https://appshunter.io/ios/app/mei-music-education-interface/id6452315691)

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

**In-app purchases:** none


### Quick Theory

[App page](https://appshunter.io/ios/app/quick-theory/id6790213145)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Yearly | $29.99 | per year |
| Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is MEI free?

MEI is free to download, with no in-app purchases.

### Is Quick Theory free?

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

### Do MEI or Quick Theory have ads?

Neither MEI nor Quick Theory shows ads.

### Which is updated more often, MEI or Quick Theory?

MEI ships an update every 2 months, and Quick Theory every 3 weeks. Most recently, MEI was updated on November 7, 2026 and Quick Theory on October 31, 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.*