# PepKit vs Stackr

The clearest difference is rating: PepKit at 4.9 against Stackr's 4.4. PepKit also leads on review sentiment (86% vs 72%). Stackr's advantage is update cadence (every 4 days vs every 5 weeks) and iOS requirement (17.0 vs 26.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. PepKit sells 2 in-app purchases, starting at $5.99 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.

PepKit holds the better App Store score, 4.9 against 4.4. Both are backed by a comparable volume of ratings — 92 and 143 respectively. Written reviews point the same way: 86% of PepKit's written reviews are positive against 72% of Stackr's.

PepKit ships an update every 5 weeks, Stackr every 4 days. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | PepKit | Stackr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (92 ratings)](https://appshunter.io/ios/app/pepkit-peptide-tracker/id6762627972/reviews)** | [4.4 (143 ratings)](https://appshunter.io/ios/app/stackr-peptide-glp-1-tracker/id6764821587/reviews) |
| Number of ratings | 92 | **143** |
| Positive reviews | **85.7% of reviews** | 72.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 days** |
| Monetization | Freemium | Freemium |
| Size | 15 MB | 88 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Loona LLC](https://appshunter.io/developer/1817974100) | [Stackr Holdings LLC](https://appshunter.io/developer/1896525659) |

## What reviewers say

### PepKit

[App page](https://appshunter.io/ios/app/pepkit-peptide-tracker/id6762627972)

Precisely track your peptide protocols with a structured system. Log doses, calculate them accurately, and stay consistent with smart reminders and a clean interface. Designed for serious tracking.

**Highlights:** Precision dose logging, Built-in dose calculator, Structured scheduling, Smart reminders, Clean interface

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $5.99 | per 7 days |
| Annual | $44.99 | per year |


### Stackr

[App page](https://appshunter.io/ios/app/stackr-peptide-glp-1-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 PepKit free?

PepKit 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, PepKit or Stackr?

PepKit is rated higher. PepKit averages 4.9 out of 5 from 92 ratings, while Stackr averages 4.4 from 143 ratings.

### Do PepKit or Stackr have ads?

Neither PepKit nor Stackr shows ads.

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

PepKit ships an update every 5 weeks, and Stackr every 4 days. Most recently, PepKit was updated on October 1, 2026 and Stackr on September 30, 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.*