# ISS Explorer vs Space Telescope App

The clearest difference is review sentiment: ISS Explorer at 100% against Space Telescope App's 40%. ISS Explorer also leads on rating (4.9 vs 4.0) and in-app purchases (none vs 4). Space Telescope App's advantage is update cadence (every 10 days vs every 10 months). On price, ratings volume and device support there is nothing between them.

Both are free to download. Space Telescope App sells 4 in-app purchases, starting at $4.99 per month. ISS Explorer asks for nothing beyond the download.

ISS Explorer holds the better App Store score, 4.9 against 4.0. Both are backed by a comparable volume of ratings — 16 and 30 respectively. Written reviews point the same way: 100% of ISS Explorer's written reviews are positive against 40% of Space Telescope App's.

ISS Explorer ships an update every 10 months, Space Telescope App every 10 days. The most recent releases landed on September 7, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | ISS Explorer | Space Telescope App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (16 ratings)](https://appshunter.io/ios/app/iss-explorer/id1429876038/reviews)** | [4.0 (30 ratings)](https://appshunter.io/ios/app/space-telescope-app/id1603876992/reviews) |
| Number of ratings | 16 | **30** |
| Positive reviews | **100.0% of reviews** | 40.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 747 MB | 104 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NASA](https://appshunter.io/developer/355542146) | [KAKHA GIORGASHVILI](https://appshunter.io/developer/1501353984) |

## What reviewers say

### 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


### Space Telescope App

[App page](https://appshunter.io/ios/app/space-telescope-app/id1603876992)

Explore the universe with real-time updates and stunning visuals from NASA's James Webb Space Telescope. Engage with expert insights, join community discussions, and test your knowledge with interactive quizzes. Discover distant galaxies and unlock the secrets of the early universe.

**Highlights:** Live mission updates, Breathtaking image gallery, Expert Q&A with astronomers, Community discussions, Interactive space quizzes, 3D solar system explorer, Exclusive wallpapers

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Ad-Free Plan | $4.99 | per month |
| Ad-Free Annual Access | $29.99 | per year |
| Premium | $2.99 | one-time |
| Buy 1M Points | $99.99 | one-time |


## Frequently asked questions

### Is ISS Explorer free?

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

### Is Space Telescope App free?

Space Telescope App is free to download, with in-app purchases available.

### Which has better reviews, ISS Explorer or Space Telescope App?

ISS Explorer is rated higher. ISS Explorer averages 4.9 out of 5 from 16 ratings, while Space Telescope App averages 4.0 from 30 ratings.

### Do ISS Explorer or Space Telescope App have ads?

Space Telescope App shows ads; ISS Explorer does not.

### Which is updated more often, ISS Explorer or Space Telescope App?

ISS Explorer ships an update every 10 months, and Space Telescope App every 10 days. Most recently, ISS Explorer was updated on September 7, 2026 and Space Telescope App on September 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.*