# Planetarium Projector vs GPT Solar System Explorer

The clearest difference is in-app purchases: Planetarium Projector at none against GPT Solar System Explorer's 5. Planetarium Projector also leads on review sentiment (22% vs 0%) and rating (5.0 vs 4.7). GPT Solar System Explorer's advantage is ratings volume (95 vs 1) and update cadence (every 2 weeks vs every 2 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 Projector asks for nothing beyond the download.

Planetarium Projector holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: GPT Solar System Explorer has 95 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 22% of Planetarium Projector's written reviews are positive against 0% of GPT Solar System Explorer's.

Planetarium Projector ships an update every 2 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 Projector | GPT Solar System Explorer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/planetarium-projector/id6471595659/reviews)** | [4.7 (95 ratings)](https://appshunter.io/ios/app/gpt-solar-system-explorer/id6743086286/reviews) |
| Number of ratings | 1 | **95** |
| Positive reviews | **22.2% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Subscription |
| Size | 574 MB | 288 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Clementoni S.p.A.](https://appshunter.io/developer/575135209) | [Apic Ways](https://appshunter.io/developer/1635604961) |

## What reviewers say

### Planetarium Projector

[App page](https://appshunter.io/ios/app/planetarium-projector/id6471595659)

Explore the universe with interactive lessons on constellations, planets, and space exploration. Engage with 3D augmented reality models and fun quizzes to learn about space history and mythology.

**Highlights:** Interactive space narrator, Augmented reality 3D models, Constellation drawing, Space conquest quiz, Planet and space facts, Rocket launching game

**Features:** macOS Compatibility

**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 Projector free?

Planetarium Projector 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.

### Which has better reviews, Planetarium Projector or GPT Solar System Explorer?

Planetarium Projector is rated higher. Planetarium Projector averages 5.0 out of 5 from 1 ratings, while GPT Solar System Explorer averages 4.7 from 95 ratings.

### Do Planetarium Projector or GPT Solar System Explorer have ads?

Neither Planetarium Projector nor GPT Solar System Explorer shows ads.

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

Planetarium Projector ships an update every 2 months, and GPT Solar System Explorer every 2 weeks. Most recently, Planetarium Projector 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.*