# Chem Viewer vs iORA

The clearest difference is rating: iORA at 5.0 against Chem Viewer's 4.0. iORA also leads on ads (none vs shown) and review sentiment (100% vs 67%). Chem Viewer's advantage is update cadence (every 4 days vs every 2 months) and iOS requirement (11.0 vs 14.3). On price, 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.

iORA holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 12 respectively. Written reviews point the same way: 67% of Chem Viewer's written reviews are positive against 100% of iORA's.

Chem Viewer ships an update every 4 days, iORA every 2 months. The most recent releases landed on September 8, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Chem Viewer | iORA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/chem-viewer/id1571068897/reviews) | **[5.0 (12 ratings)](https://appshunter.io/ios/app/iora-reaction-visualizer/id1609524913/reviews)** |
| Number of ratings | 4 | **12** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 2 months |
| Monetization | Ad-supported | **Free** |
| Size | 40 MB | 40 MB |
| Requires iOS | **11.0** | 14.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dylan Riffle](https://appshunter.io/developer/1142744409) | [Daniel Ess](https://appshunter.io/developer/1609524915) |

## What reviewers say

### Chem Viewer

[App page](https://appshunter.io/ios/app/chem-viewer/id1571068897)

Visualize chemical compounds in 2D and 3D with this app. Access over 3 million compounds from the PubChem database and interact with 3D models using touch gestures. Ideal for students, researchers, and educators.

**Highlights:** 2D and 3D chemical views, Access to 3+ million compounds, PubChem database integration, Interactive 3D model manipulation, Suitable for students and researchers

**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 Chem Viewer free?

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

### Is iORA free?

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

### Which has better reviews, Chem Viewer or iORA?

iORA is rated higher. Chem Viewer averages 4.0 out of 5 from 4 ratings, while iORA averages 5.0 from 12 ratings.

### Do Chem Viewer or iORA have ads?

Chem Viewer shows ads; iORA does not.

### Which is updated more often, Chem Viewer or iORA?

Chem Viewer ships an update every 4 days, and iORA every 2 months. Most recently, Chem Viewer was updated on September 8, 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.*