# Peptide Tracker vs Stack

The clearest difference is update cadence: Peptide Tracker at every 2 days against Stack's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Peptide Tracker sells 2 in-app purchases, starting at $7.99 per month and Stack sells 2 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Peptide Tracker ships an update every 2 days, Stack every 3 weeks. The most recent releases landed on October 5, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Peptide Tracker | Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/peptide-tracker-ai-peps/id6762054857/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 19 MB | 106 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Pepzen LLC](https://appshunter.io/developer/1882114847) | [Amari Thomas](https://appshunter.io/developer/1868315587) |

## What reviewers say

### Peptide Tracker

[App page](https://appshunter.io/ios/app/peptide-tracker-ai-peps/id6762054857)

Log research entries, reconstitution math, and personal schedules for peptide tracking. Features include scheduling reminders, site rotation tracking, and a research literature library. Offers AI insights and Apple Health integration for comprehensive self-tracking.

**Highlights:** Schedule reminders for research entries, Site rotation tracker with visual body map, Research literature library with 55+ peptides, AI insights for pattern analysis, Apple Health integration, Private and secure data storage

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $7.99 | per month |
| Annual Premium | $39.99 | per year |


### 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 |


## Frequently asked questions

### Is Peptide Tracker free?

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

### Is Stack free?

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

### Do Peptide Tracker or Stack have ads?

Neither Peptide Tracker nor Stack shows ads.

### Which is updated more often, Peptide Tracker or Stack?

Peptide Tracker ships an update every 2 days, and Stack every 3 weeks. Most recently, Peptide Tracker was updated on October 5, 2026 and Stack on October 18, 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.*