# Trajectory vs Vialmetry

The clearest difference is device support: Vialmetry at 2 against Trajectory's —. Vialmetry also leads on iOS requirement (16.4 vs 18.5). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Trajectory | Vialmetry |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/vialmetry-peptide-calculator/id6814296316/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | — | Every 2 days |
| Monetization | — | Free |
| Size | 2 MB | 44 MB |
| Requires iOS | 18.5 | **16.4** |
| Devices | — | **iPhone, iPad** |
| Age rating | 17+ | 17+ |
| Developer | [Mathieu Bonte](https://appshunter.io/developer/1876251649) | [Crestwood Holdings Management LLC](https://appshunter.io/developer/6800386430) |

## What reviewers say

### Trajectory

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

**In-app purchases:** none


### Vialmetry

[App page](https://appshunter.io/ios/app/vialmetry-peptide-calculator/id6814296316)

This app helps you privately track your vials, calculate dosages, log injections, and rotate sites. It offers a local-first logbook with no ads or tracking, and allows for export of your data.

**Highlights:** Record vial details (strength, water, mix date), Calculate syringe units and concentration, Log injections with amount, time, and site, Rotate subcutaneous injection sites, Schedule reminders for injections, Export data as spreadsheet or backup

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

**In-app purchases:** none


## Frequently asked questions

### Is Trajectory free?

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

### Is Vialmetry free?

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

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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.*