# PDB Viewer vs Crys

The clearest difference is in-app purchases: Crys at none against PDB Viewer's 1. Crys also leads on update cadence (every 4 days vs monthly). 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. Crys asks for nothing beyond the download.

PDB Viewer ships an update monthly, Crys every 4 days. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | PDB Viewer | Crys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/crys-cast/id6784123301/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | — | Free |
| Size | 2 MB | 8 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Qvyshift LLC](https://appshunter.io/developer/1536442361) | [子铭 叶](https://appshunter.io/developer/6784052907) |

## What reviewers say

### 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 |


### Crys

[App page](https://appshunter.io/ios/app/crys-cast/id6784123301)

This app allows users to view and analyze crystal structures locally on their mobile devices. It supports various file formats and offers tools for inspecting atoms, bonds, and unit cells, with features for generating simulated PXRD patterns and morphology previews.

**Highlights:** Local structure viewing, Supports CIF, XYZ, PDB, MOL, SDF, MOL2, RES files, Inspect atoms, bonds, unit cells, Display styles and scope control, Fullscreen and PXRD presentation modes, Simulated PXRD pattern generation, BFDH morphology preview

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

**In-app purchases:** none


## Frequently asked questions

### Is PDB Viewer free?

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

### Is Crys free?

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

### Do PDB Viewer or Crys have ads?

Neither PDB Viewer nor Crys shows ads.

### Which is updated more often, PDB Viewer or Crys?

PDB Viewer ships an update monthly, and Crys every 4 days. Most recently, PDB Viewer was updated on October 16, 2026 and Crys on October 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.*