# Vial AI vs Protocol

The clearest difference is ads: Protocol at none against Vial AI's shown. Protocol also leads on update cadence (every 2 days vs monthly). Vial AI's advantage is iOS requirement (15.1 vs 17.5). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Vial AI sells 4 in-app purchases, starting at $14.99 per month and Protocol sells 2 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Vial AI ships an update monthly, Protocol every 2 days. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Vial AI | 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 | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | — | Free |
| Size | 61 MB | 47 MB |
| Requires iOS | **15.1** | 17.5 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 12+ |
| Developer | [Fabio Jonathan Arifin](https://appshunter.io/developer/1803911370) | [Alexandre Masmejean](https://appshunter.io/developer/1895978437) |

## What reviewers say

### Vial AI

[App page](https://appshunter.io/ios/app/vial-ai-peptide-tracker/id6763749357)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vial Monthly | $14.99 | per month |
| Vial Premium (Special Price) | $39.99 | per year |
| Vial Yearly | $59.99 | per year |
| Vial Lifetime (Limited) | $149.99 | one-time |


### 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 Vial AI free?

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

### Is Protocol free?

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

### Do Vial AI or Protocol have ads?

Vial AI shows ads; Protocol does not.

### Which is updated more often, Vial AI or Protocol?

Vial AI ships an update monthly, and Protocol every 2 days. Most recently, Vial AI was updated on October 26, 2026 and Protocol on October 24, 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.*