# Protein Sequence Viewer vs Peptendium

The clearest difference is in-app purchases: Protein Sequence Viewer at none against Peptendium's 2. Protein Sequence Viewer also leads on update cadence (every 2 days vs monthly) and device support (3 vs 1). Peptendium's advantage is ads (none vs shown). On price there is nothing between them.

Both are free to download. Peptendium sells 2 in-app purchases, starting at $9.99 per month. Protein Sequence Viewer asks for nothing beyond the download.

Protein Sequence Viewer ships an update every 2 days, Peptendium monthly. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Protein Sequence Viewer | Peptendium |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/peptendium/id6786397444/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Monthly |
| Monetization | — | Freemium |
| Size | 25 MB | 39 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Kazunari Sasaki](https://appshunter.io/developer/1857860050) | [Ocoee Studios LLC](https://appshunter.io/developer/6784049772) |

## What reviewers say

### Protein Sequence Viewer

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Peptendium

[App page](https://appshunter.io/ios/app/peptendium/id6786397444)

This app provides an educational platform for understanding peptide science. It features a library of peptide profiles, research summaries, and learning modules to enhance research literacy. It is designed for students and researchers, focusing on educational content rather than medical advice.

**Highlights:** 297 peptide profiles with detailed information, Evidence signal to distinguish research maturity, Curated research briefs and summaries, Daily, weekly, and monthly research snapshots, Structured learning modules and lessons, Library search, filter, and comparison tools, Private notebook for research organization

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Peptendium Pro | $9.99 | per month |
| Peptendium Pro | $79.99 | per year |


## Frequently asked questions

### Is Protein Sequence Viewer free?

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

### Is Peptendium free?

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

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

Protein Sequence Viewer shows ads; Peptendium does not.

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

Protein Sequence Viewer ships an update every 2 days, and Peptendium monthly. Most recently, Protein Sequence Viewer was updated on October 5, 2026 and Peptendium on October 8, 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.*