# Hands vs Environmental Engineering PRO

The clearest difference is update cadence: Environmental Engineering PRO at every 5 months against Hands's every 25 months. Environmental Engineering PRO also leads on price ($0.49 vs $2.99) and device support (3 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

Hands costs $2.99 and Environmental Engineering PRO $0.49 up front. Neither carries in-app purchases, so what you see is what you pay.

Hands ships an update every 25 months, Environmental Engineering PRO every 5 months. The most recent releases landed on September 10, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Hands | Environmental Engineering PRO |
| --- | --- | --- |
| Price | $2.99 | **$0.49** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 5 months** |
| Size | 36 MB | 23 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### Hands

[App page](https://appshunter.io/ios/app/hands-on-math-tangrams/id778907489)

**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 Hands free?

Hands costs $2.99, with no in-app purchases.

### Is Environmental Engineering PRO free?

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

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

Neither Hands nor Environmental Engineering PRO shows ads.

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

Hands ships an update every 25 months, and Environmental Engineering PRO every 5 months. Most recently, Hands was updated on September 10, 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.*