# e++ Probability vs Environmental Engineering PRO

The clearest difference is price: e++ Probability at Free against Environmental Engineering PRO's $0.49. Environmental Engineering PRO's advantage is device support (3 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

e++ Probability 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.

## The numbers

| Metric | e++ Probability | Environmental Engineering PRO |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 5 months |
| Size | 30 MB | 23 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Modern Educational Research Society, LTD](https://appshunter.io/developer/432268704) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### e++ Probability

[App page](https://appshunter.io/ios/app/e-plus-plus-probability/id1564855389)

**Features:** macOS Compatibility

**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 e++ Probability free?

e++ Probability 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 e++ Probability or Environmental Engineering PRO have ads?

Neither e++ Probability nor Environmental Engineering PRO shows ads.

---

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