# Explain 3D vs Solar System Clock

The clearest difference is in-app purchases: Solar System Clock at none against Explain 3D's 1. Solar System Clock also leads on update cadence (every 2 days vs every 5 months). Explain 3D's advantage is iOS requirement (10.0 vs 16.6). On price, ads and device support there is nothing between them.

Both are free to download. Explain 3D sells 1 one-off in-app purchase. Solar System Clock asks for nothing beyond the download.

Explain 3D ships an update every 5 months, Solar System Clock every 2 days. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Explain 3D | Solar System Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (7 ratings)](https://appshunter.io/ios/app/explain-3d-explore-the-solar-system-free/id1051361866/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 205 MB | 5 MB |
| Requires iOS | **10.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Explain 3D](https://appshunter.io/developer/1019479194) | [Mateusz Andrzejczuk](https://appshunter.io/developer/1158375886) |

## What reviewers say

### Explain 3D

[App page](https://appshunter.io/ios/app/explain-3d-explore-the-solar-system-free/id1051361866)

Explore the solar system and universe in a 3D environment with realistic models and animations. Learn about planets and spacecrafts, with an option to suggest new simulations. The free version offers basic solar system data, while the full version unlocks more celestial bodies and spacecrafts.

**Highlights:** Interactive 3D environment, Realistic 3D models and animations, Planet and spacecraft descriptions, Engaging educational content, Suggest simulation tool, Full version with expanded content

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all simulations | $3.99 | one-time |


### Solar System Clock

[App page](https://appshunter.io/ios/app/solar-system-clock/id6746730661)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Explain 3D free?

Explain 3D is free to download, with in-app purchases available.

### Is Solar System Clock free?

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

### Do Explain 3D or Solar System Clock have ads?

Neither Explain 3D nor Solar System Clock shows ads.

### Which is updated more often, Explain 3D or Solar System Clock?

Explain 3D ships an update every 5 months, and Solar System Clock every 2 days. Most recently, Explain 3D was updated on October 13, 2026 and Solar System Clock on October 9, 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.*