# PDB Viewer vs cella

The clearest difference is update cadence: cella at every 10 days against PDB Viewer's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. PDB Viewer sells 1 one-off in-app purchase and cella sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

PDB Viewer ships an update monthly, cella every 10 days. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | PDB Viewer | cella |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cella-crystal-viewer/id6790140743/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 2 MB | 71 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Qvyshift LLC](https://appshunter.io/developer/1536442361) | [武汉回到未来科技有限公司](https://appshunter.io/developer/1891400712) |

## 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 |


### cella

[App page](https://appshunter.io/ios/app/cella-crystal-viewer/id6790140743)

Explore crystal structures in interactive 3D. Visualize atomic arrangements, view different molecular models, and access a curated atlas of common materials. Supports CIF file import and export with a one-time purchase.

**Highlights:** Interactive 3D crystal exploration, Fifteen visual Cell Notes, Curated structure atlas, Multiple view modes (ball-and-stick, space-filling), Unit cell and (hkl) plane visualization, CIF file import and export (Pro), No ads, tracking, or analytics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| cella Pro | $5.99 | one-time |


## Frequently asked questions

### Is PDB Viewer free?

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

### Is cella free?

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

### Do PDB Viewer or cella have ads?

Neither PDB Viewer nor cella shows ads.

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

PDB Viewer ships an update monthly, and cella every 10 days. Most recently, PDB Viewer was updated on October 16, 2026 and cella on October 17, 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.*