# iORA vs Calcsharp Pro

The clearest difference is price: iORA at Free against Calcsharp Pro's $1.99. iORA also leads on iOS requirement (14.3 vs 16.0). Calcsharp Pro's advantage is update cadence (every 2 days vs every 2 months). On ads, in-app purchases and device support there is nothing between them.

iORA is free to download; Calcsharp Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iORA ships an update every 2 months, Calcsharp Pro every 2 days. Both last shipped on October 9, 2026.

## The numbers

| Metric | iORA | Calcsharp Pro |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (12 ratings)](https://appshunter.io/ios/app/iora-reaction-visualizer/id1609524913/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 40 MB | 4 MB |
| Requires iOS | **14.3** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Ess](https://appshunter.io/developer/1609524915) | [Nikola Stepan](https://appshunter.io/developer/398370680) |

## What reviewers say

### iORA

[App page](https://appshunter.io/ios/app/iora-reaction-visualizer/id1609524913)

Visualize chemical reactions in 3D using quantum-mechanical simulations. This free, interactive application makes complex chemistry concepts accessible and engaging for learners.

**Highlights:** 3D chemical reaction visualization, Quantum-mechanical simulations, Interactive learning, Easy to use interface, Educational tool

**Features:** macOS Compatibility

**In-app purchases:** none


### Calcsharp Pro

[App page](https://appshunter.io/ios/app/calcsharp-pro/id1644401194)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iORA free?

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

### Is Calcsharp Pro free?

Calcsharp Pro costs $1.99, with no in-app purchases.

### Do iORA or Calcsharp Pro have ads?

Neither iORA nor Calcsharp Pro shows ads.

### Which is updated more often, iORA or Calcsharp Pro?

iORA ships an update every 2 months, and Calcsharp Pro every 2 days. Most recently, iORA was updated on October 9, 2026 and Calcsharp Pro on October 9, 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.*