# Trajectory vs Stax

The clearest difference is in-app purchases: Trajectory at none against Stax's 4. Stax's advantage is iOS requirement (16.4 vs 18.5). On price there is nothing between them.

Both are free to download. Stax sells 4 in-app purchases, starting at $6.99 per month. Trajectory asks for nothing beyond the download.

## The numbers

| Metric | Trajectory | Stax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (11 ratings)](https://appshunter.io/ios/app/stax-peptide-tracker/id6818569355/reviews)** |
| Number of ratings | — | **11** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 2 days |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 64 MB |
| Requires iOS | 18.5 | **16.4** |
| Devices | — | **iPhone** |
| Age rating | 17+ | 17+ |
| Developer | [Mathieu Bonte](https://appshunter.io/developer/1876251649) | [FARSHID ORAK](https://appshunter.io/developer/6818569357) |

## What reviewers say

### Trajectory

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

**In-app purchases:** none


### Stax

[App page](https://appshunter.io/ios/app/stax-peptide-tracker/id6818569355)

Easily log peptide shots, track your custom plan, and monitor your consistency. This private tool stores all data locally on your device, offering reminders and progress charts without requiring an account or internet connection.

**Highlights:** Log shots in seconds, Customizable daily/weekly plans, Private, local data storage, Undercover reminders, Daily, weekly, monthly progress charts, Edit/delete logged entries

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stax Plus Monthly | $6.99 | per month |
| Stax Plus Annual | $59.99 | per year |
| 14-day Trial | Free | one-time |
| Stax Plus Lifetime | $149.99 | one-time |


## Frequently asked questions

### Is Trajectory free?

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

### Is Stax free?

Stax 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.*