# Clausius vs Napier's Bones Simulation

The clearest difference is price: Clausius at Free against Napier's Bones Simulation's $1.99. Clausius also leads on update cadence (every 8 months vs every 25 months). Napier's Bones Simulation's advantage is device support (4 vs 2) and iOS requirement (12.0 vs 15.4). On ads and in-app purchases there is nothing between them.

Clausius is free to download; Napier's Bones Simulation costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Clausius ships an update every 8 months, Napier's Bones Simulation every 25 months. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Clausius | Napier's Bones Simulation |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/clausius/id1023474133/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 25 months |
| Monetization | Free | — |
| Size | 3 MB | 29 MB |
| Requires iOS | 15.4 | **12.0** |
| Devices | iPad, Mac | **iPhone, iPad, iPod, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Smitesh Bakrania](https://appshunter.io/developer/1609864392) | [Ventura Educational Systems](https://appshunter.io/developer/371324172) |

## What reviewers say

### Clausius

[App page](https://appshunter.io/ios/app/clausius/id1023474133)

Visualize thermodynamic properties of water with an intuitive, interactive chart. Ideal for engineering students, it allows users to glide their finger across T-s, P-h, and P-v diagrams to instantly access data. This tool simplifies complex thermodynamic concepts for educational purposes.

**Highlights:** Interactive thermodynamic property charts, Visual reference for water properties, T-s, P-h, and P-v diagrams, Intuitive finger-glide interface, Suitable for engineering courses

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Clausius free?

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

### Is Napier's Bones Simulation free?

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

### Do Clausius or Napier's Bones Simulation have ads?

Neither Clausius nor Napier's Bones Simulation shows ads.

### Which is updated more often, Clausius or Napier's Bones Simulation?

Clausius ships an update every 8 months, and Napier's Bones Simulation every 25 months. Most recently, Clausius was updated on November 1, 2026 and Napier's Bones Simulation on October 26, 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.*