# Trajectory vs PepStack

The clearest difference is in-app purchases: Trajectory at none against PepStack's 2. PepStack's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. PepStack sells 2 in-app purchases, starting at $4.99 per month. Trajectory asks for nothing beyond the download.

## The numbers

| Metric | Trajectory | PepStack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Size | 2 MB | 9 MB |
| Requires iOS | 18.5 | **17.0** |
| Devices | — | **iPhone, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Mathieu Bonte](https://appshunter.io/developer/1876251649) | [Daniel Son, LLC](https://appshunter.io/developer/1892058935) |

## What reviewers say

### Trajectory

[App page](https://appshunter.io/ios/app/trajectory-weight-tracker/id6759000055)

**In-app purchases:** none


### PepStack

[App page](https://appshunter.io/ios/app/pepstack-peptide-calculator/id6761916679)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PepStack Pro Monthly | $4.99 | per month |
| PepStack Pro Annual | $29.99 | per year |


## Frequently asked questions

### Is Trajectory free?

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

### Is PepStack free?

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

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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.*