# ISS Explorer vs Hydra Budding

The clearest difference is price: ISS Explorer at Free against Hydra Budding's $1.99. ISS Explorer also leads on update cadence (every 10 months vs every 44 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

ISS Explorer is free to download; Hydra Budding costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ISS Explorer ships an update every 10 months, Hydra Budding every 44 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ISS Explorer | Hydra Budding |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.9 (16 ratings)](https://appshunter.io/ios/app/iss-explorer/id1429876038/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 44 months |
| Monetization | Free | — |
| Size | 747 MB | 273 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NASA](https://appshunter.io/developer/355542146) | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) |

## 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


### Hydra Budding

[App page](https://appshunter.io/ios/app/hydra-budding-edutech-era/id1617053618)

**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 Hydra Budding free?

Hydra Budding costs $1.99, with no in-app purchases.

### Do ISS Explorer or Hydra Budding have ads?

Neither ISS Explorer nor Hydra Budding shows ads.

### Which is updated more often, ISS Explorer or Hydra Budding?

ISS Explorer ships an update every 10 months, and Hydra Budding every 44 months. Most recently, ISS Explorer was updated on October 24, 2026 and Hydra Budding on October 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.*