# Spacetime Clock vs Compass AR

The clearest difference is review sentiment: Compass AR at 100% against Spacetime Clock's 41%. Compass AR also leads on update cadence (fortnightly vs every 5 weeks). Spacetime Clock's advantage is in-app purchases (none vs 4) and iOS requirement (16.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Compass AR sells 4 one-off in-app purchases. Spacetime Clock asks for nothing beyond the download.

Spacetime Clock ships an update every 5 weeks, Compass AR fortnightly. The most recent releases landed on October 28, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Spacetime Clock | Compass AR |
| --- | --- | --- |
| 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 | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 6 MB | 8 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [y-design](https://appshunter.io/developer/398188218) | [飞 吕](https://appshunter.io/developer/1851387805) |

## 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


### Compass AR

[App page](https://appshunter.io/ios/app/compass-ar-sun-and-moon/id6755030188)

This utility app provides precise directional, altitude, and speed readings on a clear interface. It offers augmented reality views of the sun and moon's paths, along with location data and weather information. Pro features include time scrubbing, AR tracking, and speed recording.

**Highlights:** AR sun and moon tracking, Precise direction and altitude, Live speed and acceleration, Sunrise, sunset, and golden hour, Location and weather data, Time scrubbing for celestial paths

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sponsor · A Lunch | $0.99 | one-time |
| CompassPlus Pro | $2.99 | one-time |
| Sponsor · A Coffee | $2.99 | one-time |
| Sponsor · A Resupply | $6.99 | one-time |


## Frequently asked questions

### Is Spacetime Clock free?

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

### Is Compass AR free?

Compass AR is free to download, with in-app purchases available.

### Do Spacetime Clock or Compass AR have ads?

Neither Spacetime Clock nor Compass AR shows ads.

### Which is updated more often, Spacetime Clock or Compass AR?

Spacetime Clock ships an update every 5 weeks, and Compass AR fortnightly. Most recently, Spacetime Clock was updated on October 28, 2026 and Compass AR on October 30, 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.*