# Stack vs Peptly Health Tracker

The clearest difference is in-app purchases: Peptly Health Tracker at none against Stack's 2. Peptly Health Tracker also leads on update cadence (every 2 days vs every 8 days) and iOS requirement (15.1 vs 18.0). Stack's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Stack sells 2 in-app purchases, starting at $9.99 per 7 days. Peptly Health Tracker asks for nothing beyond the download.

Stack ships an update every 8 days, Peptly Health Tracker every 2 days. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Stack | Peptly Health Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/peptly-health-tracker/id6775672965/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 8 days | **Every 2 days** |
| Monetization | — | Ad-supported |
| Size | 136 MB | 26 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Amari Thomas](https://appshunter.io/developer/1868315587) | [John Chappell](https://appshunter.io/developer/6775672967) |

## What reviewers say

### Stack

[App page](https://appshunter.io/ios/app/stack-peptide-tracker/id6773488687)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stack Weekly | $9.99 | per 7 days |
| Stack Yearly | $49.99 | per year |


### Peptly Health Tracker

[App page](https://appshunter.io/ios/app/peptly-health-tracker/id6775672965)

This app helps you privately track your GLP-1 and peptide research protocols. Log doses, injection sites, and progress with simple charts and smart reminders. Connect with a username-only community for support.

**Highlights:** Log doses and injection sites, Track weight and measurements, View progress with charts, Set smart reminders, Manage vial inventory, Log bloodwork and lab markers, Access research library

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

**In-app purchases:** none


## Frequently asked questions

### Is Stack free?

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

### Is Peptly Health Tracker free?

Peptly Health Tracker is free to download, with no in-app purchases.

### Do Stack or Peptly Health Tracker have ads?

Peptly Health Tracker shows ads; Stack does not.

### Which is updated more often, Stack or Peptly Health Tracker?

Stack ships an update every 8 days, and Peptly Health Tracker every 2 days. Most recently, Stack was updated on October 1, 2026 and Peptly Health Tracker on October 5, 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.*