# Protokol vs Peptide Library

The clearest difference is in-app purchases: Peptide Library at none against Protokol's 6. Peptide Library also leads on ads (none vs shown). Protokol's advantage is iOS requirement (15.1 vs 18.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Protokol sells 6 in-app purchases, starting at $4.99 per month. Peptide Library asks for nothing beyond the download.

Protokol ships an update every 4 days, Peptide Library every 5 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Protokol | Peptide Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (17 ratings)](https://appshunter.io/ios/app/protokol-peptides-simplified/id6762504580/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 5 days |
| Monetization | Free with in-app purchases | — |
| Size | 51 MB | 16 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Lukas LeChau](https://appshunter.io/developer/1885439213) | [Jay Park](https://appshunter.io/developer/6808156571) |

## What reviewers say

### Protokol

[App page](https://appshunter.io/ios/app/protokol-peptides-simplified/id6762504580)

This educational tool helps adults learn about research peptides with a guided onboarding, a library of peptide information, and tools for calculating doses and conversions. It also features a private journal for logging activities and wellness check-ins, and an AI assistant for research-related questions.

**Highlights:** Guided onboarding for personalized research summaries, Library of 19 research peptides with summaries, Dose and reconstitution math calculators, Syringe unit conversions, Private local-first journal for logging, AI research assistant

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Protokol Premium | $4.99 | per month |
| Protokol Premium | $9.99 | per month |
| Protokol Premium | $39.99 | per year |
| Protokol Premium | $59.99 | per year |
| protokol_annual | $69.99 | per year |
| Protokol Lifetime | $99.99 | one-time |


### Peptide Library

[App page](https://appshunter.io/ios/app/peptide-library/id6808156569)

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

**In-app purchases:** none


## Frequently asked questions

### Is Protokol free?

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

### Is Peptide Library free?

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

### Do Protokol or Peptide Library have ads?

Protokol shows ads; Peptide Library does not.

### Which is updated more often, Protokol or Peptide Library?

Protokol ships an update every 4 days, and Peptide Library every 5 days. Most recently, Protokol was updated on November 5, 2026 and Peptide Library on October 31, 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.*