# MEI vs Trinity Theory Practice

The clearest difference is in-app purchases: MEI at none against Trinity Theory Practice's 6. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Trinity Theory Practice sells 6 in-app purchases, starting at $2.99 per month. MEI asks for nothing beyond the download.

MEI ships an update every 2 months, Trinity Theory Practice every 6 weeks. The most recent releases landed on November 7, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | MEI | Trinity Theory Practice |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Size | 50 MB | 100 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alberto Acquilino](https://appshunter.io/developer/1698840914) | [FLY SKY PTY LTD](https://appshunter.io/developer/1838696534) |

## 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


### Trinity Theory Practice

[App page](https://appshunter.io/ios/app/trinity-theory-practice/id6773275447)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Weekly | $3.99 | per 7 days |
| Monthly | $7.99 | per month |
| Yearly | $12.99 | per year |
| 3 Months | $16.99 | per 3 months |
| Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is MEI free?

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

### Is Trinity Theory Practice free?

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

### Do MEI or Trinity Theory Practice have ads?

Neither MEI nor Trinity Theory Practice shows ads.

### Which is updated more often, MEI or Trinity Theory Practice?

MEI ships an update every 2 months, and Trinity Theory Practice every 6 weeks. Most recently, MEI was updated on November 7, 2026 and Trinity Theory Practice on November 10, 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.*