# Stack vs PepsLab

The clearest difference is iOS requirement: PepsLab at 15.1 against Stack's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Stack sells 2 in-app purchases, starting at $9.99 per 7 days and PepsLab sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

Stack ships an update every 8 days, PepsLab every 4 days. The most recent releases landed on October 1, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Stack | PepsLab |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 4 days** |
| Monetization | — | Subscription |
| Size | 136 MB | 42 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Amari Thomas](https://appshunter.io/developer/1868315587) | [Eyko LLC](https://appshunter.io/developer/1881731925) |

## 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 |


### PepsLab

[App page](https://appshunter.io/ios/app/pepslab-peptide-tracker/id6788729970)

Manage your peptide and GLP-1 journey with this app. Track inventory, health metrics, nutrition, and personal logs. Features include AI meal scanning, injection mapping, and symptom tracking for a consistent routine.

**Highlights:** Inventory management with vial photos, Visual injection zone mapping, Symptom and dosage tracking, AI meal scanning for macro estimation, Hydration and sleep monitoring, GLP-1 weight trend visualization, AI pattern recognition for correlations

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PepsLab Pro Monthly | $8.99 | per month |
| PepsLab Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is Stack free?

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

### Is PepsLab free?

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

### Do Stack or PepsLab have ads?

Neither Stack nor PepsLab shows ads.

### Which is updated more often, Stack or PepsLab?

Stack ships an update every 8 days, and PepsLab every 4 days. Most recently, Stack was updated on October 1, 2026 and PepsLab on September 23, 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.*