# Engineering Formulas vs ISGC

The clearest difference is in-app purchases: ISGC at none against Engineering Formulas's 3. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Engineering Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. ISGC asks for nothing beyond the download.

## The numbers

| Metric | Engineering Formulas | ISGC |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 45 MB | 54 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Mobin Akhter](https://appshunter.io/developer/1812505286) | [Mohamed Ahmed Ahmed Mahmou](https://appshunter.io/developer/1840427589) |

## 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 |


### ISGC

[App page](https://appshunter.io/ios/app/isgc/id6810459573)

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

**In-app purchases:** none


## Frequently asked questions

### Is Engineering Formulas free?

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

### Is ISGC free?

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

### Do Engineering Formulas or ISGC have ads?

Neither Engineering Formulas nor ISGC shows ads.

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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.*