NASA vs Radioactive Decay Simulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NASA
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.
- NASA+ video streaming
- 21,000+ NASA images
- Latest NASA news
- Mission updates
- Podcasts
- ISS tracking and Sky View
- Augmented reality experiences
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The redesigned NASA App unlocks access to the new NASA+ video streaming service, plus all the latest NASA images, news, mission information, podcasts, and interactive augmented reality experiences to explore -- putting the universe at your fingertips! With the NASA App, you'll be able to: • Explore with unlimited access to NASA+, featuring all of NASA's official live coverage and original on-demand video series. No subscription required. • Easily view over 21,000 of the latest NASA images • Rate images and explore all of the highest rated ones • Read all the latest NASA news and feature articles • Get the latest updates on Artemis, the James Webb Space Telescope, and other exciting NASA missions. • Listen to our podcasts featuring astronauts and experts who take you on a tour of the galaxy without ever leaving Earth. • Set an alert for when the International Space Station will fly over your location and use the Sky View feature to help you locate the station during the visible pass • Experience our rovers and rockets up close and personal with augmented reality. • And so much more! Download the updated NASA App now!
Radioactive Decay Simulator
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.
- Emulates radioactive decay
- Select preset or custom atoms
- Adjust atom count
- Real-time decay graphs
- Adjustable simulation speed
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The Radioactive Decay Simulator emulates the radioactive decay of a group of like atoms. Users are able to select from a range of preset atoms, or enter the half-life of a specific atom that they wish to simulate. By adjusting the number of atoms, users are able to determine how even with a large number of atoms, the randomness of radioactive decay can be modeled. Users are able to observe the both number of decayed atoms as well as the number of non-decayed atoms remaining in a real time graph. The simulator can be sped up to allow atoms with a longer half-life to be analyzed quickly.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | NASA | Radioactive Decay Simulator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (64K ratings) — better | 4.0 (1 ratings) |
| Positive reviews | 69.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 64K — better | 1 |
| Update frequency | Every 2 weeks — better | Every 17 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Apple TV — better | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 9.3 — better |
| Further details — not scored | ||
| Size | 60 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | NASA | Alistair Shaw |
Customer experience
NASA
Radioactive Decay Simulator
Bugs and requests
NASA
Reported bugs
4 issues- 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
5 requests- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
NASA
No in-app purchases
Radioactive Decay Simulator
No in-app purchases
Questions
Is NASA free?
Is Radioactive Decay Simulator free?
Which has better reviews, NASA or Radioactive Decay Simulator?
Do NASA or Radioactive Decay Simulator have ads?
Which is updated more often, NASA or Radioactive Decay Simulator?
Other comparisons
