# PLANETARIUM vs GPT Solar System Explorer

The clearest difference is in-app purchases: PLANETARIUM at none against GPT Solar System Explorer's 5. PLANETARIUM also leads on review sentiment (25% vs 0%) and iOS requirement (11.0 vs 15.0). GPT Solar System Explorer's advantage is update cadence (every 2 weeks vs every 49 months). On price, ads and device support there is nothing between them.

Both are free to download. GPT Solar System Explorer sells 5 in-app purchases, starting at $5.99 per month. PLANETARIUM asks for nothing beyond the download.

PLANETARIUM ships an update every 49 months, GPT Solar System Explorer every 2 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | PLANETARIUM | GPT Solar System Explorer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (95 ratings)](https://appshunter.io/ios/app/gpt-solar-system-explorer/id6743086286/reviews)** |
| Number of ratings | — | **95** |
| Positive reviews | **25.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 49 months | **Every 2 weeks** |
| Monetization | **Free** | Subscription |
| Size | 195 MB | 288 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WAY Srl](https://appshunter.io/developer/1707864476) | [Apic Ways](https://appshunter.io/developer/1635604961) |

## What reviewers say

### PLANETARIUM

[App page](https://appshunter.io/ios/app/planetarium/id1532715462)

Discover the Solar System with this educational app. Explore planets, land on points of interest to learn more, and test your knowledge with quizzes. Embark on a cosmic journey and learn about our celestial neighbors.

**Highlights:** Explore the Solar System, Learn about planets, Interactive landing points, Knowledge-testing quizzes, Educational content

**In-app purchases:** none


### GPT Solar System Explorer

[App page](https://appshunter.io/ios/app/gpt-solar-system-explorer/id6743086286)

Explore our Solar System in an interactive 3D environment powered by AI. Discover stunning images and videos from space agencies, and ask your AI guide anything about the cosmos. Perfect for curious minds of all ages.

**Highlights:** Interactive 3D Solar System model, AI-powered cosmic guide, NASA, SpaceX, ESA imagery & videos, Planet and mission details, Voice-activated Q&A, Intuitive controls for all ages

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro Subscription | $5.99 | per month |
| Monthly Super Pro Subscription | $19.99 | per month |
| Monthly Ultra Pro Subscription | $29.99 | per month |
| Yearly Pro Subscription | $39.99 | per year |
| AI coins | $5.99 | one-time |


## Frequently asked questions

### Is PLANETARIUM free?

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

### Is GPT Solar System Explorer free?

GPT Solar System Explorer is free to download, with in-app purchases available.

### Do PLANETARIUM or GPT Solar System Explorer have ads?

Neither PLANETARIUM nor GPT Solar System Explorer shows ads.

### Which is updated more often, PLANETARIUM or GPT Solar System Explorer?

PLANETARIUM ships an update every 49 months, and GPT Solar System Explorer every 2 weeks. Most recently, PLANETARIUM was updated on October 24, 2026 and GPT Solar System Explorer 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.*