# atom.sim vs iORA

The clearest difference is update cadence: iORA at every 2 months against atom.sim's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

atom.sim ships an update every 7 months, iORA every 2 months. The most recent releases landed on September 10, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | atom.sim | iORA |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 78 MB | 40 MB |
| Requires iOS | 15.0 | **14.3** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hans Kovi](https://appshunter.io/developer/1493527465) | [Daniel Ess](https://appshunter.io/developer/1609524915) |

## What reviewers say

### atom.sim

[App page](https://appshunter.io/ios/app/atomsim/id1493527466)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is atom.sim free?

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

### Is iORA free?

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

### Do atom.sim or iORA have ads?

Neither atom.sim nor iORA shows ads.

### Which is updated more often, atom.sim or iORA?

atom.sim ships an update every 7 months, and iORA every 2 months. Most recently, atom.sim was updated on September 10, 2026 and iORA on September 7, 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.*