# Protein Guide vs PDB Viewer

The clearest difference is in-app purchases: Protein Guide at none against PDB Viewer's 1. Protein Guide also leads on iOS requirement (11.0 vs 16.0). PDB Viewer's advantage is update cadence (monthly vs every 9 months). On price, ads and device support there is nothing between them.

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

Protein Guide ships an update every 9 months, PDB Viewer monthly. Both last shipped on October 16, 2026.

## The numbers

| Metric | Protein Guide | PDB Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (36 ratings)](https://appshunter.io/ios/app/protein-guide/id1375157917/reviews)** | — |
| Number of ratings | **36** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Monetization | Free | — |
| Size | 224 MB | 2 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Axton Pitt](https://appshunter.io/developer/957165645) | [Qvyshift LLC](https://appshunter.io/developer/1536442361) |

## What reviewers say

### Protein Guide

[App page](https://appshunter.io/ios/app/protein-guide/id1375157917)

Explore the intricate stages of protein structure with detailed diagrams, explanations, and animations. This app serves as a valuable reference for both beginners and experienced individuals, offering insights into unique properties and biological functions.

**Highlights:** Detailed diagrams of protein structure, Explanations of protein stages, Animations of protein structures, Information on unique properties and functions, Example proteins demonstrating structural aspects, ClassKit integration for teachers

**Features:** macOS Compatibility

**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 Protein Guide free?

Protein Guide 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 Protein Guide or PDB Viewer have ads?

Neither Protein Guide nor PDB Viewer shows ads.

### Which is updated more often, Protein Guide or PDB Viewer?

Protein Guide ships an update every 9 months, and PDB Viewer monthly. Most recently, Protein Guide was updated on October 16, 2026 and PDB Viewer on October 16, 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.*