# USA Unit Converter vs Trajectory

The clearest difference is ads: USA Unit Converter at none against Trajectory's shown. Trajectory's advantage is update cadence (fortnightly vs every 14 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

USA Unit Converter ships an update every 14 months, Trajectory fortnightly. Both last shipped on October 11, 2026.

## The numbers

| Metric | USA Unit Converter | Trajectory |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 14 months | **Fortnightly** |
| Size | 2 MB | 36 MB |
| Requires iOS | **17.0** | 17.7.2 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Andrey Seleznev](https://appshunter.io/developer/1665252540) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### USA Unit Converter

[App page](https://appshunter.io/ios/app/usa-unit-converter/id1669915305)

**Features:** macOS Compatibility

**In-app purchases:** none


### Trajectory

[App page](https://appshunter.io/ios/app/trajectory-detection/id6511212764)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is USA Unit Converter free?

USA Unit Converter is free to download, with no in-app purchases.

### Is Trajectory free?

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

### Do USA Unit Converter or Trajectory have ads?

Trajectory shows ads; USA Unit Converter does not.

### Which is updated more often, USA Unit Converter or Trajectory?

USA Unit Converter ships an update every 14 months, and Trajectory fortnightly. Most recently, USA Unit Converter was updated on October 11, 2026 and Trajectory on October 11, 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.*