# Encyclopedia vs GPT Solar System Explorer

The clearest difference is review sentiment: Encyclopedia at 83% against GPT Solar System Explorer's 0%. Encyclopedia also leads on monetization model (free with in-app purchases vs subscription). GPT Solar System Explorer's advantage is rating (4.7 vs 3.8) and update cadence (every 2 weeks vs monthly). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Encyclopedia sells 1 one-off in-app purchase and GPT Solar System Explorer sells 5 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

GPT Solar System Explorer holds the better App Store score, 4.7 against 3.8. That said, the two scores are not equally well evidenced: GPT Solar System Explorer has 90 ratings behind it against 14, so its average is the more settled of the two. Written reviews complicate that: 83% of Encyclopedia's written reviews are positive against 0% of GPT Solar System Explorer's, so the app with the better star average is not the one people write more warmly about.

Encyclopedia ships an update monthly, GPT Solar System Explorer every 2 weeks. The most recent releases landed on October 4, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Encyclopedia | GPT Solar System Explorer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (14 ratings)](https://appshunter.io/ios/app/encyclopedia-solar-system/id1124568774/reviews) | **[4.7 (90 ratings)](https://appshunter.io/ios/app/gpt-solar-system-explorer/id6743086286/reviews)** |
| Number of ratings | 14 | **90** |
| Positive reviews | **83.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 322 MB | 288 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Good Spider, LLC](https://appshunter.io/developer/1487595667) | [Apic Ways](https://appshunter.io/developer/1635604961) |

## What reviewers say

### Encyclopedia

[App page](https://appshunter.io/ios/app/encyclopedia-solar-system/id1124568774)

Explore the solar system with extensive articles and high-definition images. This app offers comprehensive information, engaging content, and a user-friendly interface, making it suitable for both children and adults interested in space.

**Highlights:** Thousands of articles and HD photos, Comprehensive solar system information, Engaging and easy-to-understand content, Offline availability, Badge collection for reading, Intuitive user interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


### 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 Encyclopedia free?

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

### Is GPT Solar System Explorer free?

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

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

GPT Solar System Explorer is rated higher. Encyclopedia averages 3.8 out of 5 from 14 ratings, while GPT Solar System Explorer averages 4.7 from 90 ratings.

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

Neither Encyclopedia nor GPT Solar System Explorer shows ads.

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

Encyclopedia ships an update monthly, and GPT Solar System Explorer every 2 weeks. Most recently, Encyclopedia was updated on October 4, 2026 and GPT Solar System Explorer on October 8, 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.*