# COMPOUND vs Stacksy

The clearest difference is monetization model: COMPOUND at free with in-app purchases against Stacksy's subscription. Stacksy's advantage is update cadence (every 2 days vs every 9 days) and ratings volume (16 vs 3). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. COMPOUND sells 5 in-app purchases, starting at $6.99 per 7 days and Stacksy sells 5 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for COMPOUND against 5.0 for Stacksy. That said, the two scores are not equally well evidenced: Stacksy has 16 ratings behind it against 3, so its average is the more settled of the two.

COMPOUND ships an update every 9 days, Stacksy every 2 days. The most recent releases landed on September 29, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | COMPOUND | Stacksy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/compound-peptide-calculator/id6762041256/reviews) | [5.0 (16 ratings)](https://appshunter.io/ios/app/stacksy/id6782694853/reviews) |
| Number of ratings | 3 | **16** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 2 days** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 52 MB | 65 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Torben Nils Seidler](https://appshunter.io/developer/1834241692) | [Velor4 LLC](https://appshunter.io/developer/6782694855) |

## What reviewers say

### COMPOUND

[App page](https://appshunter.io/ios/app/compound-peptide-calculator/id6762041256)

This app provides advanced tracking and analysis for peptide and TRT protocols. It uses AI to analyze interactions, correlate side effects with dosing, and scan bloodwork results. Manage complex stacks with smart reconstitution, a comprehensive database, and interactive pharmacokinetics.

**Highlights:** AI Stack Analyzer for interaction warnings, Side-Effect Correlation Engine, Bloodwork OCR Scanner, Smart Reconstitution calculations, 42-Compound Database with research links, Protocol AI Chat for personalized advice, Interactive Stack Pharmacokinetics visualization

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Compound Pro · Weekly | $6.99 | per 7 days |
| Compound Pro · Quarterly | $24.99 | per 3 months |
| Compound Pro · Yearly DISCOUNTED | $34.99 | per year |
| Compound Pro · Yearly | $49.99 | per year |
| COMPOUND Pro · Yearly | $69.99 | per year |


### Stacksy

[App page](https://appshunter.io/ios/app/stacksy/id6782694853)

Organize and track your personal peptide protocol with this private application. Manage your entire routine, including what peptides to take and when. Offers monthly and yearly subscription plans for full access.

**Highlights:** Organize peptide protocols, Track peptide dosages, Schedule peptide intake, Private routine management, GLP-1 tracking

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stacksy Pro (Monthly) | $9.99 | per month |
| Stacksy Pro (Yearly) | $24.99 | per year |
| Stacksy Pro (Yearly) | $24.99 | per year |
| Stacksy Pro (Yearly) | $24.99 | per year |
| Stacksy Pro (Yearly) | $39.99 | per year |


## Frequently asked questions

### Is COMPOUND free?

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

### Is Stacksy free?

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

### Which has better reviews, COMPOUND or Stacksy?

COMPOUND and Stacksy are both rated 5.0 out of 5 on the App Store, from 3 and 16 ratings respectively.

### Do COMPOUND or Stacksy have ads?

Neither COMPOUND nor Stacksy shows ads.

### Which is updated more often, COMPOUND or Stacksy?

COMPOUND ships an update every 9 days, and Stacksy every 2 days. Most recently, COMPOUND was updated on September 29, 2026 and Stacksy on October 11, 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.*