# SP vs Control Systems Engineering

The clearest difference is in-app purchases: SP at none against Control Systems Engineering's 6. SP also leads on update cadence (fortnightly vs every 3 months) and iOS requirement (13.4 vs 17.0). Control Systems Engineering's advantage is ads (none vs shown). On price 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. SP asks for nothing beyond the download.

SP ships an update fortnightly, Control Systems Engineering every 3 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | SP | Control Systems Engineering |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 3 months |
| Size | 38 MB | 18 MB |
| Requires iOS | **13.4** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Oleksii Horda](https://appshunter.io/developer/1675881257) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### SP

[App page](https://appshunter.io/ios/app/sp-superior-quality/id6446092454)

**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 SP free?

SP 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 SP or Control Systems Engineering have ads?

SP shows ads; Control Systems Engineering does not.

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

SP ships an update fortnightly, and Control Systems Engineering every 3 months. Most recently, SP was updated on November 3, 2026 and Control Systems Engineering on October 30, 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.*