# Copernicus Sentinel vs ISS Explorer

The clearest difference is review sentiment: ISS Explorer at 100% against Copernicus Sentinel's 14%. ISS Explorer also leads on rating (4.9 vs 4.3). Copernicus Sentinel's advantage is update cadence (every 2 months vs every 10 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ISS Explorer holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 18 and 16 respectively. Written reviews point the same way: 14% of Copernicus Sentinel's written reviews are positive against 100% of ISS Explorer's.

Copernicus Sentinel ships an update every 2 months, ISS Explorer every 10 months. The most recent releases landed on September 14, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Copernicus Sentinel | ISS Explorer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (18 ratings)](https://appshunter.io/ios/app/copernicus-sentinel/id1036738151/reviews) | **[4.9 (16 ratings)](https://appshunter.io/ios/app/iss-explorer/id1429876038/reviews)** |
| Number of ratings | **18** | 16 |
| Positive reviews | 14.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 56 MB | 747 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ESA - European Space Agency](https://appshunter.io/developer/429660009) | [NASA](https://appshunter.io/developer/355542146) |

## What reviewers say

### Copernicus Sentinel

[App page](https://appshunter.io/ios/app/copernicus-sentinel/id1036738151)

Explore and track Earth observation satellites in real-time. Discover satellite details, view 3D models, and receive notifications for overhead passes. Stay updated on the latest news and products from this space observation program.

**Highlights:** Real-time satellite tracking, Detailed 3D satellite models, Overhead pass notifications, Latest news and product updates, Historical data transmission visualization, Interactive 3D globe exploration

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

**In-app purchases:** none


### ISS Explorer

[App page](https://appshunter.io/ios/app/iss-explorer/id1429876038)

Explore a detailed 3D model of the International Space Station. Rotate, zoom, and select individual components to learn about their function and systems. Organize your view by turning parts and labels on or off.

**Highlights:** Interactive 3D ISS model, Rotate and zoom functionality, Selectable parts with isolation, Detailed information on components, Hierarchical part organization, Toggle parts and labels

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Copernicus Sentinel free?

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

### Is ISS Explorer free?

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

### Which has better reviews, Copernicus Sentinel or ISS Explorer?

ISS Explorer is rated higher. Copernicus Sentinel averages 4.3 out of 5 from 18 ratings, while ISS Explorer averages 4.9 from 16 ratings.

### Do Copernicus Sentinel or ISS Explorer have ads?

Neither Copernicus Sentinel nor ISS Explorer shows ads.

### Which is updated more often, Copernicus Sentinel or ISS Explorer?

Copernicus Sentinel ships an update every 2 months, and ISS Explorer every 10 months. Most recently, Copernicus Sentinel was updated on September 14, 2026 and ISS Explorer on September 7, 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.*