# Explain 3D vs Astris

The clearest difference is in-app purchases: Astris at none against Explain 3D's 1. Astris also leads on update cadence (every 3 months vs every 5 months). Explain 3D's advantage is iOS requirement (10.0 vs 15.0). 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. Astris asks for nothing beyond the download.

Explain 3D ships an update every 5 months, Astris every 3 months. The most recent releases landed on October 22, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Explain 3D | Astris |
| --- | --- | --- |
| 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 3 months** |
| Monetization | Free with in-app purchases | — |
| Size | 205 MB | 21 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Explain 3D](https://appshunter.io/developer/1019479194) | [ISTITUTI EDMONDO DE AMICIS SRL](https://appshunter.io/developer/1219261025) |

## 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 |


### Astris

[App page](https://appshunter.io/ios/app/astris/id6454899891)

**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 Astris free?

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

### Do Explain 3D or Astris have ads?

Neither Explain 3D nor Astris shows ads.

### Which is updated more often, Explain 3D or Astris?

Explain 3D ships an update every 5 months, and Astris every 3 months. Most recently, Explain 3D was updated on October 22, 2026 and Astris on October 6, 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.*