# WebMO Molecule Editor vs Chem Viewer

The clearest difference is in-app purchases: Chem Viewer at none against WebMO Molecule Editor's 2. Chem Viewer also leads on update cadence (every 4 days vs every 3 months). WebMO Molecule Editor's advantage is ads (none vs shown) and ratings volume (40 vs 4). On price, rating, review sentiment and device support there is nothing between them.

Both are free to download. WebMO Molecule Editor sells 2 one-off in-app purchases. Chem Viewer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.0 for WebMO Molecule Editor against 4.0 for Chem Viewer. That said, the two scores are not equally well evidenced: WebMO Molecule Editor has 40 ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 60% of WebMO Molecule Editor's written reviews are positive against 67% of Chem Viewer's.

WebMO Molecule Editor ships an update every 3 months, Chem Viewer every 4 days. The most recent releases landed on September 3, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | WebMO Molecule Editor | Chem Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (40 ratings)](https://appshunter.io/ios/app/webmo-molecule-editor/id797898095/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/chem-viewer/id1571068897/reviews) |
| Number of ratings | **40** | 4 |
| Positive reviews | 60.4% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 12 MB | 40 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WebMO, LLC](https://appshunter.io/developer/797898098) | [Dylan Riffle](https://appshunter.io/developer/1142744409) |

## What reviewers say

### WebMO Molecule Editor

[App page](https://appshunter.io/ios/app/webmo-molecule-editor/id797898095)

Create and explore 3D molecular structures, visualize chemical properties, and access extensive chemical databases. This tool is ideal for students and educators needing on-the-go access to molecular information and computational chemistry resources.

**Highlights:** 3D molecular editor, Structure optimization, Orbital and symmetry visualization, Chemical database lookup, Spectra visualization, High-resolution image capture, Computational chemistry program integration

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WebMO Premium for paid users | Free | one-time |
| WebMO Premium | $4.99 | one-time |


### 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


## Frequently asked questions

### Is WebMO Molecule Editor free?

WebMO Molecule Editor is free to download, with in-app purchases available.

### Is Chem Viewer free?

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

### Which has better reviews, WebMO Molecule Editor or Chem Viewer?

WebMO Molecule Editor is rated higher. WebMO Molecule Editor averages 4.0 out of 5 from 40 ratings, while Chem Viewer averages 4.0 from 4 ratings.

### Do WebMO Molecule Editor or Chem Viewer have ads?

Chem Viewer shows ads; WebMO Molecule Editor does not.

### Which is updated more often, WebMO Molecule Editor or Chem Viewer?

WebMO Molecule Editor ships an update every 3 months, and Chem Viewer every 4 days. Most recently, WebMO Molecule Editor was updated on September 3, 2026 and Chem Viewer on September 8, 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.*