# DLR COMETS vs GPT Solar System Explorer

The clearest difference is in-app purchases: DLR COMETS at none against GPT Solar System Explorer's 5. DLR COMETS also leads on iOS requirement (8.1 vs 15.0). On price, review sentiment, update cadence and ads 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. DLR COMETS asks for nothing beyond the download.

DLR COMETS ships an update every 3 weeks, GPT Solar System Explorer every 2 weeks. The most recent releases landed on September 8, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | DLR COMETS | GPT Solar System Explorer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (90 ratings)](https://appshunter.io/ios/app/gpt-solar-system-explorer/id6743086286/reviews)** |
| Number of ratings | — | **90** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | **Free** | Subscription |
| Size | 416 MB | 288 MB |
| Requires iOS | **8.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DLR German Aerospace Center e.V.](https://appshunter.io/developer/418202933) | [Apic Ways](https://appshunter.io/developer/1635604961) |

## What reviewers say

### DLR COMETS

[App page](https://appshunter.io/ios/app/dlr-comets/id1363156480)

Explore the Rosetta mission to Comet 67P/Churyumov-Gerasimenko through an interactive exhibition. Discover the science behind comets and the historic Philae lander touchdown. Relive this exceptional spaceflight adventure with multimedia content.

**Highlights:** Interactive comet model, Mission highlights and photographs, Historical background on comets, Rosetta mission science, Philae lander touchdown details, Personal stories from the mission

**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 DLR COMETS free?

DLR COMETS 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 DLR COMETS or GPT Solar System Explorer have ads?

Neither DLR COMETS nor GPT Solar System Explorer shows ads.

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

DLR COMETS ships an update every 3 weeks, and GPT Solar System Explorer every 2 weeks. Most recently, DLR COMETS was updated on September 8, 2026 and GPT Solar System Explorer on September 21, 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.*