# PeptidePal vs Stackr

The clearest difference is review sentiment: Stackr at 78% against PeptidePal's 31%. Stackr also leads on ads (none vs shown). PeptidePal's advantage is ratings volume (4.7K vs 126) and rating (4.7 vs 4.5). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. PeptidePal sells 17 in-app purchases, starting at $3.99 per 7 days and Stackr sells 7 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

PeptidePal holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: PeptidePal has 4.7K ratings behind it against 126, so its average is the more settled of the two. Written reviews complicate that: 31% of PeptidePal's written reviews are positive against 78% of Stackr's, so the app with the better star average is not the one people write more warmly about.

PeptidePal ships an update every 5 days, Stackr every 3 days. Both last shipped on September 22, 2026.

## The numbers

| Metric | PeptidePal | Stackr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (4.7K ratings)](https://appshunter.io/ios/app/peptidepal-peptide-tracker/id6762102880/reviews)** | [4.5 (126 ratings)](https://appshunter.io/ios/app/stackr-peptide-tracker/id6764821587/reviews) |
| Number of ratings | **4.7K** | 126 |
| Positive reviews | 31.1% of reviews | **78.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 days | **Every 3 days** |
| Monetization | Free with in-app purchases | Freemium |
| Best chart rank | **#116** | — |
| Size | 102 MB | 58 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [Blank Labs LLC](https://appshunter.io/developer/1871385584) | [Stackr Holdings LLC](https://appshunter.io/developer/1896525659) |

## What reviewers say

### PeptidePal

[App page](https://appshunter.io/ios/app/peptidepal-peptide-tracker/id6762102880)

**Currently charting:** #116 Top Grossing · Health & Fitness (US App Store)

This app helps users track GLP-1 medications, research peptides, and TRT. It offers a protocol builder, a comprehensive peptide library, and a reconstitution calculator with visual aids. It also includes supply alerts and injection site rotation guidance.

**Highlights:** GLP-1 shot tracking, Research peptide tracking, TRT tracking, Protocol builder, Reconstitution calculator, Vial inventory & supply alerts, Injection site rotation

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

**In-app purchases (17)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PeptidePal – Weekly | $3.99 | per 7 days |
| PeptidePal – Weekly | $4.99 | per 7 days |
| PeptidePal – Monthly | $8.99 | per month |
| PeptidePal – Monthly | $9.99 | per month |
| PeptidePal – Monthly | $11.99 | per month |
| PeptidePal – Monthly | $12.99 | per month |
| PeptidePal – Monthly | $14.99 | per month |
| PeptidePal – Monthly | $19.99 | per month |
| PeptidePal – Quarterly | $29.99 | per 3 months |
| PeptidePal – Yearly | $29.99 | per year |
| PeptidePal – Yearly | $35.99 | per year |
| PeptidePal – Yearly | $35.99 | per year |
| PeptidePal – Yearly | $39.99 | per year |
| PeptidePal – Yearly | $39.99 | per year |
| PeptidePal – Yearly | $44.99 | per year |
| PeptidePal – Yearly | $59.99 | per year |
| PeptidePal – Yearly | $79.99 | per year |


### 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 |


## Frequently asked questions

### Is PeptidePal free?

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

### Is Stackr free?

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

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

PeptidePal is rated higher. PeptidePal averages 4.7 out of 5 from 4.7K ratings, while Stackr averages 4.5 from 126 ratings.

### Do PeptidePal or Stackr have ads?

PeptidePal shows ads; Stackr does not.

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

PeptidePal ships an update every 5 days, and Stackr every 3 days. Most recently, PeptidePal was updated on September 22, 2026 and Stackr on September 22, 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.*