# PrepFE vs Control Systems Engineering

The clearest difference is device support: PrepFE at 3 against Control Systems Engineering's 1. PrepFE also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. PrepFE sells 6 one-off in-app purchases and Control Systems Engineering sells 6 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

PrepFE ships an update every 2 months, Control Systems Engineering every 3 months. The most recent releases landed on August 30, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | PrepFE | Control Systems Engineering |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.2 (22 ratings)](https://appshunter.io/ios/app/prepfe-fe-other-disciplines/id1473720159/reviews)** | — |
| Number of ratings | **22** | — |
| Positive reviews | 8.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 288 MB | 18 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [PrepFE, Inc.](https://appshunter.io/developer/1499557437) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### PrepFE

[App page](https://appshunter.io/ios/app/prepfe-fe-other-disciplines/id1473720159)

Prepare for your FE exam with practice problems and flashcards. Learn engineering concepts and the FE Reference Handbook on the go. This app offers curated content by experts to help you start your professional engineering journey.

**Highlights:** Practice FE exam questions, Interactive practice exams, Hundreds of practice questions, Detailed step-by-step explanations, Flashcards for reference handbook, Progress tracking and analysis

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Access Renewal | $47.99 | one-time |
| 1 Month Access | $59.99 | one-time |
| 3 Months Access Renewal | $61.99 | one-time |
| 6 Months Access Renewal | $75.99 | one-time |
| 3 Months Access | $79.99 | one-time |
| 6 Months Access | $99.99 | one-time |


### 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 PrepFE free?

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

### Is Control Systems Engineering free?

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

### Do PrepFE or Control Systems Engineering have ads?

Neither PrepFE nor Control Systems Engineering shows ads.

### Which is updated more often, PrepFE or Control Systems Engineering?

PrepFE ships an update every 2 months, and Control Systems Engineering every 3 months. Most recently, PrepFE was updated on August 30, 2026 and Control Systems Engineering on June 11, 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.*