# ProtAct17 vs Environmental Engineering PRO

The clearest difference is price: ProtAct17 at Free against Environmental Engineering PRO's $0.49. On update cadence, ads, in-app purchases and device support there is nothing between them.

ProtAct17 is free to download; Environmental Engineering PRO costs $0.49 up front. Neither carries in-app purchases, so what you see is what you pay.

ProtAct17 ships an update every 9 months, Environmental Engineering PRO every 5 months. The most recent releases landed on October 17, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | ProtAct17 | Environmental Engineering PRO |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 5 months** |
| Size | 187 MB | 23 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [KIDS interactive GmbH](https://appshunter.io/developer/731500021) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### ProtAct17

[App page](https://appshunter.io/ios/app/protact17/id6446908812)

**In-app purchases:** none


### Environmental Engineering PRO

[App page](https://appshunter.io/ios/app/environmental-engineering-pro/id6759217834)

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

**In-app purchases:** none


## Frequently asked questions

### Is ProtAct17 free?

ProtAct17 is free to download, with no in-app purchases.

### Is Environmental Engineering PRO free?

Environmental Engineering PRO costs $0.49, with no in-app purchases.

### Do ProtAct17 or Environmental Engineering PRO have ads?

Neither ProtAct17 nor Environmental Engineering PRO shows ads.

### Which is updated more often, ProtAct17 or Environmental Engineering PRO?

ProtAct17 ships an update every 9 months, and Environmental Engineering PRO every 5 months. Most recently, ProtAct17 was updated on October 17, 2026 and Environmental Engineering PRO on October 4, 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.*