# Spacetime Clock vs Screen Test

The clearest difference is in-app purchases: Spacetime Clock at none against Screen Test's 1. Spacetime Clock also leads on ads (none vs shown). Screen Test's advantage is update cadence (weekly vs every 5 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Screen Test sells 1 one-off in-app purchase. Spacetime Clock asks for nothing beyond the download.

Spacetime Clock ships an update every 5 weeks, Screen Test weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Spacetime Clock | Screen Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.8 (4 ratings)](https://appshunter.io/ios/app/spacetime-clock/id404558956/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 40.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Weekly** |
| Monetization | Paid | — |
| Size | 6 MB | 11 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [y-design](https://appshunter.io/developer/398188218) | [Yunus Gunduz](https://appshunter.io/developer/1694137492) |

## What reviewers say

### Spacetime Clock

[App page](https://appshunter.io/ios/app/spacetime-clock/id404558956)

Explore celestial mechanics and terrestrial positioning with this app. Visualize moon phases, Earth's rotation, and your location's latitude and longitude. It also includes a compass and level meter for your device.

**Highlights:** Moon phases visualization, Earth rotation and revolution simulation, Latitude and longitude display, Compass functionality, iPhone level meter, Customizable background colors

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

**In-app purchases:** none


### Screen Test

[App page](https://appshunter.io/ios/app/screen-test-dead-pixel-check/id6759452371)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | one-time |


## Frequently asked questions

### Is Spacetime Clock free?

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

### Is Screen Test free?

Screen Test is free to download, with in-app purchases available.

### Do Spacetime Clock or Screen Test have ads?

Screen Test shows ads; Spacetime Clock does not.

### Which is updated more often, Spacetime Clock or Screen Test?

Spacetime Clock ships an update every 5 weeks, and Screen Test weekly. Most recently, Spacetime Clock was updated on October 24, 2026 and Screen Test on October 25, 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.*