# IU Natatorium vs Protocol

The clearest difference is in-app purchases: IU Natatorium at none against Protocol's 2. IU Natatorium also leads on iOS requirement (14.0 vs 17.5). Protocol's advantage is update cadence (every 2 days vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. Protocol sells 2 in-app purchases, starting at $1.99 per 7 days. IU Natatorium asks for nothing beyond the download.

IU Natatorium ships an update every 7 months, Protocol every 2 days. The most recent releases landed on September 19, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | IU Natatorium | Protocol |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/protocol-peptides/id6764390731/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 days** |
| Monetization | — | Free |
| Size | 45 MB | 47 MB |
| Requires iOS | **14.0** | 17.5 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 12+ |
| Developer | [InnoSoft Canada Inc.](https://appshunter.io/developer/672385534) | [Alexandre Masmejean](https://appshunter.io/developer/1895978437) |

## What reviewers say

### IU Natatorium

[App page](https://appshunter.io/ios/app/iu-natatorium/id1632034512)

**In-app purchases:** none


### Protocol

[App page](https://appshunter.io/ios/app/protocol-peptides/id6764390731)

This app helps users meticulously track peptide cycles, logging each injection with customizable details. It provides comprehensive guides on reconstitution, injection techniques, and safety, alongside personalized reminders and progress tracking.

**Highlights:** Log peptide injections with customizable details, Curated library of 25+ compounds, Add custom compounds and edit entries, Streak counter and dose history, Per-peptide reminders with native iOS notifications, Built-in safety and how-to guides, Personalized onboarding based on goals and experience

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Protocol Pro | $1.99 | per 7 days |
| Protocol Pro | $39.99 | per year |


## Frequently asked questions

### Is IU Natatorium free?

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

### Is Protocol free?

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

### Do IU Natatorium or Protocol have ads?

Neither IU Natatorium nor Protocol shows ads.

### Which is updated more often, IU Natatorium or Protocol?

IU Natatorium ships an update every 7 months, and Protocol every 2 days. Most recently, IU Natatorium was updated on September 19, 2026 and Protocol on October 2, 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.*