# RetroFit! vs PepKit

The clearest difference is in-app purchases: RetroFit! at none against PepKit's 2. RetroFit! also leads on iOS requirement (17.2 vs 26.0). PepKit's advantage is update cadence (every 6 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. PepKit sells 2 in-app purchases, starting at $5.99 per 7 days. RetroFit! asks for nothing beyond the download.

RetroFit! ships an update every 4 months, PepKit every 6 weeks. The most recent releases landed on October 25, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | RetroFit! | PepKit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (163 ratings)](https://appshunter.io/ios/app/pepkit-peptide-tracker/id6762627972/reviews)** |
| Number of ratings | — | **163** |
| Positive reviews | — | 87.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | — | Freemium |
| Size | 1 MB | 17 MB |
| Requires iOS | **17.2** | 26.0 |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Nicholas Pompea](https://appshunter.io/developer/1444570173) | [Loona LLC](https://appshunter.io/developer/1817974100) |

## What reviewers say

### RetroFit!

[App page](https://appshunter.io/ios/app/retrofit/id6478472221)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is RetroFit! free?

RetroFit! is free to download, with no in-app purchases.

### Is PepKit free?

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

### Do RetroFit! or PepKit have ads?

Neither RetroFit! nor PepKit shows ads.

### Which is updated more often, RetroFit! or PepKit?

RetroFit! ships an update every 4 months, and PepKit every 6 weeks. Most recently, RetroFit! was updated on October 25, 2026 and PepKit on November 5, 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.*