# Relativity Widget vs Trajectory

The clearest difference is ads: Relativity Widget at none against Trajectory's shown. Relativity Widget also leads on iOS requirement (14.0 vs 17.7.2). Trajectory's advantage is update cadence (fortnightly vs every 6 months). On price, in-app purchases and device support there is nothing between them.

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

Relativity Widget ships an update every 6 months, Trajectory fortnightly. The most recent releases landed on October 30, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Relativity Widget | Trajectory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/relativity-widget/id1534420574/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 1 MB | 36 MB |
| Requires iOS | **14.0** | 17.7.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Eliott Morgensztern](https://appshunter.io/developer/1478504124) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Relativity Widget

[App page](https://appshunter.io/ios/app/relativity-widget/id1534420574)

Visualize Einstein's theories of relativity directly on your home screen. Choose between Special Relativity to see time dilation in a spaceship or General Relativity to observe time differences near a black hole.

**Highlights:** Special Relativity visualization, General Relativity visualization, Time dilation display, Home screen integration, Customizable speed/distance settings

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

**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 Relativity Widget free?

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

### Is Trajectory free?

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

### Do Relativity Widget or Trajectory have ads?

Trajectory shows ads; Relativity Widget does not.

### Which is updated more often, Relativity Widget or Trajectory?

Relativity Widget ships an update every 6 months, and Trajectory fortnightly. Most recently, Relativity Widget was updated on October 30, 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.*