# Trajectory vs One Step Challenges

The clearest difference is in-app purchases: Trajectory at none against One Step Challenges's 2. One Step Challenges's advantage is device support and iOS requirement (15.1 vs 18.5). On price there is nothing between them.

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

## The numbers

| Metric | Trajectory | One Step Challenges |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 3 days |
| Size | 2 MB | 30 MB |
| Requires iOS | 18.5 | **15.1** |
| Devices | — | **iPhone, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Mathieu Bonte](https://appshunter.io/developer/1876251649) | [JUSTIN MORGAN MAYEUR](https://appshunter.io/developer/1896273983) |

## What reviewers say

### Trajectory

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

**In-app purchases:** none


### One Step Challenges

[App page](https://appshunter.io/ios/app/one-step-challenges/id6766305390)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Step Pro Monthly | $4.99 | per month |
| One Step Pro Annual | $34.99 | per year |


## Frequently asked questions

### Is Trajectory free?

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

### Is One Step Challenges free?

One Step Challenges 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.*