# Control Systems Engineering vs Building Code Calculator

The clearest difference is in-app purchases: Building Code Calculator at none against Control Systems Engineering's 6. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Control Systems Engineering sells 6 in-app purchases, starting at $9.99 per month. Building Code Calculator asks for nothing beyond the download.

Control Systems Engineering ships an update every 3 months, Building Code Calculator every 2 months. The most recent releases landed on September 14, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Control Systems Engineering | Building Code Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Size | 18 MB | 1 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [Oklahoma State University](https://appshunter.io/developer/393442180) |

## What reviewers say

### Control Systems Engineering

[App page](https://appshunter.io/ios/app/control-systems-engineering/id6739731886)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


### Building Code Calculator

[App page](https://appshunter.io/ios/app/building-code-calculator/id6747673691)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Control Systems Engineering free?

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

### Is Building Code Calculator free?

Building Code Calculator is free to download, with no in-app purchases.

### Do Control Systems Engineering or Building Code Calculator have ads?

Neither Control Systems Engineering nor Building Code Calculator shows ads.

### Which is updated more often, Control Systems Engineering or Building Code Calculator?

Control Systems Engineering ships an update every 3 months, and Building Code Calculator every 2 months. Most recently, Control Systems Engineering was updated on September 14, 2026 and Building Code Calculator on September 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*