# IST Quiz App vs Control Systems Engineering

The clearest difference is in-app purchases: IST Quiz App at none against Control Systems Engineering's 6. IST Quiz App also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.0). Control Systems Engineering's advantage is update cadence (every 3 months vs every 12 months). On price and ads there is nothing between them.

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

IST Quiz App ships an update every 12 months, Control Systems Engineering every 3 months. The most recent releases landed on September 15, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | IST Quiz App | Control Systems Engineering |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 months** |
| Size | 22 MB | 18 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Patricia Pauli](https://appshunter.io/developer/1587769862) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### IST Quiz App

[App page](https://appshunter.io/ios/app/ist-quiz-app/id1491663052)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is IST Quiz App free?

IST Quiz App is free to download, with no in-app purchases.

### Is Control Systems Engineering free?

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

### Do IST Quiz App or Control Systems Engineering have ads?

Neither IST Quiz App nor Control Systems Engineering shows ads.

### Which is updated more often, IST Quiz App or Control Systems Engineering?

IST Quiz App ships an update every 12 months, and Control Systems Engineering every 3 months. Most recently, IST Quiz App was updated on September 15, 2026 and Control Systems Engineering 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.*