# Engineering Formulas vs ML Engineer Pro Prep

The clearest difference is update cadence: ML Engineer Pro Prep at every 3 weeks against Engineering Formulas's every 2 months. ML Engineer Pro Prep also leads on iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Engineering Formulas sells 3 in-app purchases, starting at $4.99 per 7 days and ML Engineer Pro Prep sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Engineering Formulas ships an update every 2 months, ML Engineer Pro Prep every 3 weeks. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Engineering Formulas | ML Engineer Pro Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 45 MB | 84 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 12+ | 4+ |
| Developer | [Mobin Akhter](https://appshunter.io/developer/1812505286) | [AITYTECH](https://appshunter.io/developer/1885549185) |

## What reviewers say

### Engineering Formulas

[App page](https://appshunter.io/ios/app/engineering-formulas-engiref/id6758258119)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $29.99 | per year |
| Lifetime Access | $54.99 | one-time |


### 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 Engineering Formulas free?

Engineering Formulas 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 Engineering Formulas or ML Engineer Pro Prep have ads?

Neither Engineering Formulas nor ML Engineer Pro Prep shows ads.

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

Engineering Formulas ships an update every 2 months, and ML Engineer Pro Prep every 3 weeks. Most recently, Engineering Formulas was updated on October 4, 2026 and ML Engineer Pro Prep on October 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.*