# ISS Explorer vs 영 단어즙

The clearest difference is update cadence: ISS Explorer at every 10 months against 영 단어즙's every 33 months. ISS Explorer also leads on ratings volume (16 vs 3) and iOS requirement (13.0 vs 15.6). On price, rating, review sentiment and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.9 for ISS Explorer against 5.0 for 영 단어즙. That said, the two scores are not equally well evidenced: ISS Explorer has 16 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

ISS Explorer ships an update every 10 months, 영 단어즙 every 33 months. The most recent releases landed on September 7, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | ISS Explorer | 영 단어즙 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (16 ratings)](https://appshunter.io/ios/app/iss-explorer/id1429876038/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/id1480979760/reviews)** |
| Number of ratings | **16** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 33 months |
| Monetization | Free | Free |
| Size | 747 MB | 20 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NASA](https://appshunter.io/developer/355542146) | [별책](https://appshunter.io/developer/569035377) |

## 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


### 영 단어즙

[App page](https://appshunter.io/ios/app/id1480979760)

This app offers a concentrated approach to learning English vocabulary through daily, bite-sized "juice" extractions. It uses a quiz format to help users memorize words, tracking incorrect answers for targeted review. Various visual styles and an integrated English-English dictionary enhance the learning experience.

**Highlights:** Daily vocabulary "juice" extraction, Quiz-based learning format, Tracking of incorrect words for review, Integrated Oxford English-English dictionary, Native speaker pronunciation audio, iCloud data synchronization, Customizable learning deadlines

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

**In-app purchases:** none


## Frequently asked questions

### Is ISS Explorer free?

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

### Is 영 단어즙 free?

영 단어즙 is free to download, with no in-app purchases.

### Which has better reviews, ISS Explorer or 영 단어즙?

영 단어즙 is rated higher. ISS Explorer averages 4.9 out of 5 from 16 ratings, while 영 단어즙 averages 5.0 from 3 ratings.

### Do ISS Explorer or 영 단어즙 have ads?

Neither ISS Explorer nor 영 단어즙 shows ads.

### Which is updated more often, ISS Explorer or 영 단어즙?

ISS Explorer ships an update every 10 months, and 영 단어즙 every 33 months. Most recently, ISS Explorer was updated on September 7, 2026 and 영 단어즙 on September 17, 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.*