# NASA vs Radioactive Decay Simulator

The clearest difference is rating: NASA at 4.8 against Radioactive Decay Simulator's 4.0. NASA also leads on update cadence (every 2 weeks vs every 17 months) and ratings volume (64K vs 1). Radioactive Decay Simulator's advantage is review sentiment (100% vs 70%) and iOS requirement (9.3 vs 15.6). On price, ads, in-app purchases and monetization model there is nothing between them.

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

NASA holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: NASA has 64K ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 70% of NASA's written reviews are positive against 100% of Radioactive Decay Simulator's, so the app with the better star average is not the one people write more warmly about.

NASA ships an update every 2 weeks, Radioactive Decay Simulator every 17 months. The most recent releases landed on November 8, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | NASA | Radioactive Decay Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (64K ratings)](https://appshunter.io/ios/app/nasa/id334325516/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/radioactive-decay-simulator/id959357000/reviews) |
| Number of ratings | **64K** | 1 |
| Positive reviews | 69.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 17 months |
| Monetization | Free | Free |
| Size | 60 MB | 20 MB |
| Requires iOS | 15.6 | **9.3** |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NASA](https://appshunter.io/developer/355542146) | [Alistair Shaw](https://appshunter.io/developer/959356999) |

## What reviewers say

### NASA

[App page](https://appshunter.io/ios/app/nasa/id334325516)

Explore the universe with access to live and on-demand NASA+ videos, a vast collection of stunning images, and the latest mission news. Discover interactive augmented reality experiences and track the International Space Station's path.

**Highlights:** NASA+ video streaming, 21,000+ NASA images, Latest NASA news, Mission updates, Podcasts, ISS tracking and Sky View, Augmented reality experiences

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Fast loading
- 👍 Informative and educational
- 🌟 Amazing images and videos
- 💻 Great for learning about space
- 🔭 Comprehensive space information

**What reviewers complain about**

- 🐛 Crashes and freezes
- 🔍 Difficult to navigate and find content
- 📺 Missing live streaming features
- 🔄 Outdated user interface
- 🔍 Lack of search functionality

**Reported bugs**

- Crashes on launch for some devices
- Inability to close/exit image viewer
- Notifications not working as expected
- Incompatibility issues with newer iOS versions

**Requested features**

- Add live streaming of NASA TV
- Improve navigation and search
- Implement dark mode option
- Bring back old features (e.g. APOD widget, ISS sightings)
- Enhance 3D models and AR capabilities


### Radioactive Decay Simulator

[App page](https://appshunter.io/ios/app/radioactive-decay-simulator/id959357000)

This educational tool simulates radioactive decay for a group of atoms. Users can choose preset atoms or input custom half-lives to observe decay in real-time graphs. The simulator allows for adjustments in atom count and speed for efficient analysis.

**Highlights:** Emulates radioactive decay, Select preset or custom atoms, Adjust atom count, Real-time decay graphs, Adjustable simulation speed

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NASA free?

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

### Is Radioactive Decay Simulator free?

Radioactive Decay Simulator is free to download, with no in-app purchases.

### Which has better reviews, NASA or Radioactive Decay Simulator?

NASA is rated higher. NASA averages 4.8 out of 5 from 64K ratings, while Radioactive Decay Simulator averages 4.0 from 1 ratings.

### Do NASA or Radioactive Decay Simulator have ads?

Neither NASA nor Radioactive Decay Simulator shows ads.

### Which is updated more often, NASA or Radioactive Decay Simulator?

NASA ships an update every 2 weeks, and Radioactive Decay Simulator every 17 months. Most recently, NASA was updated on November 8, 2026 and Radioactive Decay Simulator on November 1, 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.*