# Peptid.io vs Stack

The clearest difference is update cadence: Stack at every 3 weeks against Peptid.io's every 6 weeks. Peptid.io's advantage is iOS requirement (13.4 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Peptid.io sells 3 in-app purchases, starting at $19.99 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.

Peptid.io ships an update every 6 weeks, Stack every 3 weeks. The most recent releases landed on October 8, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Peptid.io | Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/peptidio-peptides-and-macros/id6770778753/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 31 MB | 106 MB |
| Requires iOS | **13.4** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Denis Korovkin](https://appshunter.io/developer/1896763442) | [Amari Thomas](https://appshunter.io/developer/1868315587) |

## What reviewers say

### Peptid.io

[App page](https://appshunter.io/ios/app/peptidio-peptides-and-macros/id6770778753)

This app serves as a research companion and private log for adults interested in peptides, GLP-1 protocols, and nutrition. It allows users to build protocols, log doses with detailed notes, track nutrition goals, and access an evidence-based library. An AI coach provides educational insights on compounds and their mechanisms.

**Highlights:** Protocol building with compound stacks, Dose logging with injection site map, Estimated compound level tracking, Vial inventory and reconstitution calculation, Calorie and macro goal setting, AI-powered educational coach, Evidence-based compound library

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $19.99 | per month |
| Pro 6-Month | $79.99 | per 6 months |
| Pro Annual | $99.99 | 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 Peptid.io free?

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

### Is Stack free?

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

### Do Peptid.io or Stack have ads?

Neither Peptid.io nor Stack shows ads.

### Which is updated more often, Peptid.io or Stack?

Peptid.io ships an update every 6 weeks, and Stack every 3 weeks. Most recently, Peptid.io was updated on October 8, 2026 and Stack on October 19, 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.*