# Pre vs ML Engineer Pro Prep

The clearest difference is update cadence: ML Engineer Pro Prep at every 3 weeks against Pre's every 31 months. ML Engineer Pro Prep also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Pre sells 1 in-app purchase, starting at $4.99 per month and ML Engineer Pro Prep sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Pre ships an update every 31 months, ML Engineer Pro Prep every 3 weeks. The most recent releases landed on September 15, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Pre | ML Engineer Pro Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 31 months | **Every 3 weeks** |
| Size | 296 MB | 84 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Math Galaxy](https://appshunter.io/developer/500490521) | [AITYTECH](https://appshunter.io/developer/1885549185) |

## What reviewers say

### Pre

[App page](https://appshunter.io/ios/app/pre-algebra-fundamentals/id551027794)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PreAlgebra - Math Galaxy | $4.99 | per month |


### ML Engineer Pro Prep

[App page](https://appshunter.io/ios/app/ml-engineer-pro-prep/id6762125525)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Lifetime | $3.99 | one-time |


## Frequently asked questions

### Is Pre free?

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

### Is ML Engineer Pro Prep free?

ML Engineer Pro Prep is free to download, with in-app purchases available.

### Do Pre or ML Engineer Pro Prep have ads?

Neither Pre nor ML Engineer Pro Prep shows ads.

### Which is updated more often, Pre or ML Engineer Pro Prep?

Pre ships an update every 31 months, and ML Engineer Pro Prep every 3 weeks. Most recently, Pre was updated on September 15, 2026 and ML Engineer Pro Prep on September 14, 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.*