# Protocol vs Stacker

The clearest difference is ads: Protocol at none against Stacker's shown. Protocol also leads on monetization model (free vs free with in-app purchases) and rating (5.0 vs 4.8). Stacker's advantage is ratings volume (26 vs 1). On price, update cadence, in-app purchases 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 and Stacker sells 3 in-app purchases, starting at $49.99 per year. Whichever you choose, the download price is not the number that matters.

Protocol holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Stacker has 26 ratings behind it against 1, so its average is the more settled of the two.

Protocol ships an update every 2 days, Stacker every 4 days. The most recent releases landed on November 5, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Protocol | Stacker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/protocol-peptides/id6764390731/reviews)** | [4.8 (26 ratings)](https://appshunter.io/ios/app/stacker-peptide-tracker/id6776001253/reviews) |
| Number of ratings | 1 | **26** |
| Positive reviews | — | 85.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 47 MB | 52 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 17+ |
| Developer | [Alexandre Masmejean](https://appshunter.io/developer/1895978437) | [Above Capital LLC](https://appshunter.io/developer/6776001255) |

## What reviewers say

### 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 |


### Stacker

[App page](https://appshunter.io/ios/app/stacker-peptide-tracker/id6776001253)

This app helps you discover peptide stacks tailored to your health goals, track your routine with smart reminders, and monitor your progress with photos and metrics. It also features a peptide library and an AI assistant for information.

**Highlights:** Personalized stack recommendations, Curated peptide stack library, Routine and progress tracking, Smart scheduling and reminders, Peptide information catalog, AI peptide assistant (Pro), Partnered product purchasing (Pro)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stacker Pro | $49.99 | per year |
| Stacker Pro | $69.99 | per year |
| Stacker Pro | $129.99 | per year |


## Frequently asked questions

### Is Protocol free?

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

### Is Stacker free?

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

### Which has better reviews, Protocol or Stacker?

Protocol is rated higher. Protocol averages 5.0 out of 5 from 1 ratings, while Stacker averages 4.8 from 26 ratings.

### Do Protocol or Stacker have ads?

Stacker shows ads; Protocol does not.

### Which is updated more often, Protocol or Stacker?

Protocol ships an update every 2 days, and Stacker every 4 days. Most recently, Protocol was updated on November 5, 2026 and Stacker on November 13, 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.*