# BioViewer vs Protein Sequence Viewer

The clearest difference is ads: BioViewer at none against Protein Sequence Viewer's shown. Protein Sequence Viewer's advantage is update cadence (every 2 days vs every 9 days) and iOS requirement (13.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BioViewer ships an update every 9 days, Protein Sequence Viewer every 2 days. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | BioViewer | Protein Sequence Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/bioviewer/id1593006498/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 9 days | **Every 2 days** |
| Monetization | Free | — |
| Size | 9 MB | 25 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Raul Monton Pinillos](https://appshunter.io/developer/1576884003) | [Kazunari Sasaki](https://appshunter.io/developer/1857860050) |

## What reviewers say

### BioViewer

[App page](https://appshunter.io/ios/app/bioviewer/id1593006498)

Visualize 3D molecular structures from .pdb files on iOS, iPadOS, and macOS. Features smooth rendering, drag-and-drop support, and publication-quality photo exports for detailed analysis.

**Highlights:** 3D molecular structure visualization, Supports .pdb and .xyz files, Drag and drop functionality, Photo Mode with high-quality exports, Multi-model PDB support, Optimized for ProMotion displays

**In-app purchases:** none


### Protein Sequence Viewer

[App page](https://appshunter.io/ios/app/protein-sequence-viewer/id6758012449)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BioViewer free?

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

### Is Protein Sequence Viewer free?

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

### Do BioViewer or Protein Sequence Viewer have ads?

Protein Sequence Viewer shows ads; BioViewer does not.

### Which is updated more often, BioViewer or Protein Sequence Viewer?

BioViewer ships an update every 9 days, and Protein Sequence Viewer every 2 days. Most recently, BioViewer was updated on October 14, 2026 and Protein Sequence Viewer on October 5, 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.*