# Protein Sequence Viewer vs PlasmidViewer Pro

The clearest difference is in-app purchases: Protein Sequence Viewer at none against PlasmidViewer Pro's 2. Protein Sequence Viewer also leads on update cadence (every 2 days vs every 4 months) and iOS requirement (13.0 vs 17.0). PlasmidViewer Pro's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. PlasmidViewer Pro sells 2 in-app purchases, starting at $4.99 per month. Protein Sequence Viewer asks for nothing beyond the download.

Protein Sequence Viewer ships an update every 2 days, PlasmidViewer Pro every 4 months. The most recent releases landed on November 9, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Protein Sequence Viewer | PlasmidViewer Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 4 months |
| Size | 25 MB | 7 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Kazunari Sasaki](https://appshunter.io/developer/1857860050) | [MARTIN WILLIAMS](https://appshunter.io/developer/6786027753) |

## What reviewers say

### Protein Sequence Viewer

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

**Features:** macOS Compatibility

**In-app purchases:** none


### PlasmidViewer Pro

[App page](https://appshunter.io/ios/app/plasmidviewer-pro/id6786027751)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PlasmidViewer Pro (Monthly) | $4.99 | per month |
| PlasmidViewer Pro (Yearly) | $49.99 | per year |


## Frequently asked questions

### Is Protein Sequence Viewer free?

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

### Is PlasmidViewer Pro free?

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

### Do Protein Sequence Viewer or PlasmidViewer Pro have ads?

Protein Sequence Viewer shows ads; PlasmidViewer Pro does not.

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

Protein Sequence Viewer ships an update every 2 days, and PlasmidViewer Pro every 4 months. Most recently, Protein Sequence Viewer was updated on November 9, 2026 and PlasmidViewer Pro on November 13, 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.*