# Napier's Bones Simulation vs Environmental Engineering PRO

The clearest difference is update cadence: Environmental Engineering PRO at every 5 months against Napier's Bones Simulation's every 25 months. Environmental Engineering PRO also leads on price ($0.49 vs $1.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Napier's Bones Simulation costs $1.99 and Environmental Engineering PRO $0.49 up front. Neither carries in-app purchases, so what you see is what you pay.

Napier's Bones Simulation ships an update every 25 months, Environmental Engineering PRO every 5 months. The most recent releases landed on September 23, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Napier's Bones Simulation | Environmental Engineering PRO |
| --- | --- | --- |
| Price | $1.99 | **$0.49** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 5 months** |
| Size | 29 MB | 23 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod, Apple TV** | 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

### Napier's Bones Simulation

[App page](https://appshunter.io/ios/app/napiers-bones-simulation/id1093899282)

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

**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 Napier's Bones Simulation free?

Napier's Bones Simulation costs $1.99, with no in-app purchases.

### Is Environmental Engineering PRO free?

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

### Do Napier's Bones Simulation or Environmental Engineering PRO have ads?

Neither Napier's Bones Simulation nor Environmental Engineering PRO shows ads.

### Which is updated more often, Napier's Bones Simulation or Environmental Engineering PRO?

Napier's Bones Simulation ships an update every 25 months, and Environmental Engineering PRO every 5 months. Most recently, Napier's Bones Simulation was updated on September 23, 2026 and Environmental Engineering PRO on September 17, 2026.

---

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