# Stackr vs Pepmax

The clearest difference is rating: Pepmax at 5.0 against Stackr's 4.5. Stackr's advantage is ratings volume (126 vs 3). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Stackr sells 7 in-app purchases, starting at $7.99 per 7 days and Pepmax sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Pepmax holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Stackr has 126 ratings behind it against 3, so its average is the more settled of the two.

Stackr ships an update every 3 days, Pepmax every 4 days. The most recent releases landed on September 22, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Stackr | Pepmax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (126 ratings)](https://appshunter.io/ios/app/stackr-peptide-tracker/id6764821587/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/pepmax-peptide-dose-tracker/id6782624392/reviews)** |
| Number of ratings | **126** | 3 |
| Positive reviews | 78.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 days |
| Monetization | Freemium | Freemium |
| Size | 58 MB | 68 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 17+ |
| Developer | [Stackr Holdings LLC](https://appshunter.io/developer/1896525659) | [Viral Ventures Enterprises LLC](https://appshunter.io/developer/6782624394) |

## What reviewers say

### Stackr

[App page](https://appshunter.io/ios/app/stackr-peptide-tracker/id6764821587)

This app simplifies tracking peptide and GLP-1 doses, including supplies like vials and pens. It offers smart reminders, home screen widgets, and visual charts of estimated active levels based on half-life. Designed for users managing peptide protocols, it keeps your dosing information organized and accessible.

**Highlights:** Log peptide and GLP-1 doses, Track vials, pens, and other supplies, Smart reminders for next doses, Home screen widgets, Estimated active level charts, Multi-peptide stack tracking, Reference pages for common compounds

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackr+ Weekly | $7.99 | per 7 days |
| Monthly | $12.99 | per month |
| Stackr+ Yearly | $29.99 | per year |
| Stackr+ Yearly | $49.99 | per year |
| Stackr+ Yearly | $49.99 | per year |
| Stackr+ Yearly | $59.99 | per year |
| Yearly | $69.99 | per year |


### Pepmax

[App page](https://appshunter.io/ios/app/pepmax-peptide-dose-tracker/id6782624392)

This app helps users meticulously track their peptide protocols. It calculates reconstitution, logs doses, manages vial inventory, and monitors cycle structure. Users can also journal daily metrics and access a reference library for common compounds.

**Highlights:** Reconstitution calculator, Fast dose logging, Real cycle tracking, Vial inventory management, Daily journal, Reference library

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Annual | $19.99 | per year |
| Annual | $29.99 | per year |


## Frequently asked questions

### Is Stackr free?

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

### Is Pepmax free?

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

### Which has better reviews, Stackr or Pepmax?

Pepmax is rated higher. Stackr averages 4.5 out of 5 from 126 ratings, while Pepmax averages 5.0 from 3 ratings.

### Do Stackr or Pepmax have ads?

Neither Stackr nor Pepmax shows ads.

### Which is updated more often, Stackr or Pepmax?

Stackr ships an update every 3 days, and Pepmax every 4 days. Most recently, Stackr was updated on September 22, 2026 and Pepmax on September 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.*