# iORA vs Chembook

The clearest difference is in-app purchases: iORA at none against Chembook's 1. iORA also leads on iOS requirement (14.3 vs 17.0). Chembook's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Chembook sells 1 one-off in-app purchase. iORA asks for nothing beyond the download.

iORA ships an update every 2 months, Chembook every 3 weeks. The most recent releases landed on October 9, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | iORA | Chembook |
| --- | --- | --- |
| Price | Free | Free |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 40 MB | 110 MB |
| Requires iOS | **14.3** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Ess](https://appshunter.io/developer/1609524915) | [Hyuk-Yong Kwon](https://appshunter.io/developer/6796681340) |

## 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


### Chembook

[App page](https://appshunter.io/ios/app/chembook-reaction-visualizer/id6796681338)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $6.99 | one-time |


## Frequently asked questions

### Is iORA free?

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

### Is Chembook free?

Chembook is free to download, with in-app purchases available.

### Do iORA or Chembook have ads?

Neither iORA nor Chembook shows ads.

### Which is updated more often, iORA or Chembook?

iORA ships an update every 2 months, and Chembook every 3 weeks. Most recently, iORA was updated on October 9, 2026 and Chembook on September 29, 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.*