# PeptideJournal vs YDUN

The clearest difference is price: YDUN at Free against PeptideJournal's $5.99. YDUN also leads on iOS requirement (15.0 vs 17.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

YDUN is free to download; PeptideJournal costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | PeptideJournal | YDUN |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.3 (20 ratings)](https://appshunter.io/ios/app/peptidejournal/id6751492210/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Paid | — |
| Size | 12 MB | 20 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Christopher Madrid](https://appshunter.io/developer/1835373775) | [Ydun SRL](https://appshunter.io/developer/6780828839) |

## What reviewers say

### PeptideJournal

[App page](https://appshunter.io/ios/app/peptidejournal/id6751492210)

This app helps you precisely calculate peptide doses, manage your inventory, and track your usage history. It offers smart scheduling and detailed analytics, all while keeping your data private and secure on your device.

**Highlights:** Precision dose calculation, Reconstitution simulation, Inventory management, Dose history tracking, Usage analytics, Smart scheduling, Calendar integration

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

**In-app purchases:** none


### YDUN

[App page](https://appshunter.io/ios/app/ydun/id6780828837)

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

**In-app purchases:** none


## Frequently asked questions

### Is PeptideJournal free?

PeptideJournal costs $5.99, with no in-app purchases.

### Is YDUN free?

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

### Do PeptideJournal or YDUN have ads?

Neither PeptideJournal nor YDUN shows ads.

### Which is updated more often, PeptideJournal or YDUN?

PeptideJournal ships an update weekly, and YDUN weekly. Most recently, PeptideJournal was updated on October 24, 2026 and YDUN on October 7, 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.*