# Abaculator vs Environmental Engineering PRO

The clearest difference is price: Abaculator at Free against Environmental Engineering PRO's $0.49. Environmental Engineering PRO's advantage is update cadence (every 5 months vs every 35 months) and iOS requirement (13.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

Abaculator 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.

Abaculator ships an update every 35 months, Environmental Engineering PRO every 5 months. The most recent releases landed on September 9, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Abaculator | Environmental Engineering PRO |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Every 5 months** |
| Size | 45 MB | 23 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Chi-Cheng Liao](https://appshunter.io/developer/1053803113) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### Abaculator

[App page](https://appshunter.io/ios/app/abaculator/id1634634260)

**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 Abaculator free?

Abaculator 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 Abaculator or Environmental Engineering PRO have ads?

Neither Abaculator nor Environmental Engineering PRO shows ads.

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

Abaculator ships an update every 35 months, and Environmental Engineering PRO every 5 months. Most recently, Abaculator was updated on September 9, 2026 and Environmental Engineering PRO on September 17, 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.*