# Molecule World vs PDB Viewer

The clearest difference is in-app purchases: Molecule World at none against PDB Viewer's 1. PDB Viewer's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PDB Viewer sells 1 one-off in-app purchase. Molecule World asks for nothing beyond the download.

Molecule World ships an update every 2 months, PDB Viewer every 3 weeks. The most recent releases landed on September 20, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Molecule World | PDB Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/molecule-world/id863565223/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 8 MB | 2 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Digital World Biology LLC](https://appshunter.io/developer/863565226) | [Qvyshift LLC](https://appshunter.io/developer/1536442361) |

## What reviewers say

### Molecule World

[App page](https://appshunter.io/ios/app/molecule-world/id863565223)

Explore interactive 3D models of molecules, proteins, and DNA. This educational tool allows users to manipulate structures, experiment with visualization styles, and learn about chemical properties. Ideal for students and science enthusiasts of all ages.

**Highlights:** Interactive 3D molecule manipulation, Experiment with drawing and coloring styles, View and control molecular sequences (protein, DNA, RNA), Identify elements and investigate molecular properties, Capture images of molecular structures, Explore themed collections of molecules

**In-app purchases:** none


### PDB Viewer

[App page](https://appshunter.io/ios/app/pdb-viewer-3d-molecules/id6777468488)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDB Viewer Pro | $9.99 | one-time |


## Frequently asked questions

### Is Molecule World free?

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

### Is PDB Viewer free?

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

### Do Molecule World or PDB Viewer have ads?

Neither Molecule World nor PDB Viewer shows ads.

### Which is updated more often, Molecule World or PDB Viewer?

Molecule World ships an update every 2 months, and PDB Viewer every 3 weeks. Most recently, Molecule World was updated on September 20, 2026 and PDB Viewer 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.*