# 知识星图 vs GPT Solar System Explorer

The clearest difference is review sentiment: 知识星图 at 100% against GPT Solar System Explorer's 0%. 知识星图 also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 知识星图 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.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 30, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | 知识星图 | GPT Solar System Explorer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (96 ratings)](https://appshunter.io/ios/app/gpt-solar-system-explorer/id6743086286/reviews)** |
| Number of ratings | — | **96** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | — | Subscription |
| Size | 356 MB | 288 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Chisheng Technology Co., Ltd](https://appshunter.io/developer/1622788640) | [Apic Ways](https://appshunter.io/developer/1635604961) |

## What reviewers say

### 知识星图

[App page](https://appshunter.io/ios/app/id6504549693)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 知识星图年会员 | $14.99 | 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 知识星图 free?

知识星图 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.

### Do 知识星图 or GPT Solar System Explorer have ads?

Neither 知识星图 nor GPT Solar System Explorer shows ads.

### Which is updated more often, 知识星图 or GPT Solar System Explorer?

知识星图 ships an update every 2 weeks, and GPT Solar System Explorer every 2 weeks. Most recently, 知识星图 was updated on October 30, 2026 and GPT Solar System Explorer on November 4, 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.*