# Radioactive Decay Simulator vs Physics Lab AR

The clearest difference is review sentiment: Radioactive Decay Simulator at 100% against Physics Lab AR's 48%. Radioactive Decay Simulator also leads on in-app purchases (none vs 7) and iOS requirement (9.3 vs 15.0). Physics Lab AR's advantage is rating (4.7 vs 4.0) and update cadence (every 2 months vs every 17 months). On price, ads and device support there is nothing between them.

Both are free to download. Physics Lab AR sells 7 in-app purchases, starting at $1.49 per month. Radioactive Decay Simulator asks for nothing beyond the download.

Physics Lab AR holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Physics Lab AR has 1.9K ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 100% of Radioactive Decay Simulator's written reviews are positive against 48% of Physics Lab AR's, so the app with the better star average is not the one people write more warmly about.

Radioactive Decay Simulator ships an update every 17 months, Physics Lab AR every 2 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Radioactive Decay Simulator | Physics Lab AR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/radioactive-decay-simulator/id959357000/reviews) | **[4.7 (1.9K ratings)](https://appshunter.io/ios/app/physics-lab-ar/id1298984261/reviews)** |
| Number of ratings | 1 | **1.9K** |
| Positive reviews | **100.0% of reviews** | 47.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 20 MB | 177 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alistair Shaw](https://appshunter.io/developer/959356999) | [Turtle Sim LLC](https://appshunter.io/developer/1568741108) |

## What reviewers say

### 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


### Physics Lab AR

[App page](https://appshunter.io/ios/app/physics-lab-ar/id1298984261)

Explore physics through interactive virtual experiments and augmented reality. Build and test electrical circuits with over 100 components, visualize electromagnetic fields, and even design your own galaxy. Ideal for students, teachers, and curious minds of all ages.

**Highlights:** Virtual lab with AR mode, Build 3D electric circuits, 100+ circuit components, Precise scientific calculations, Electromagnetic field visualization, Design custom galaxies

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Component Subscription | $1.49 | per month |
| 60 Diamonds | $0.99 | one-time |
| 10 Diamonds | $0.99 | one-time |
| 120 Diamonds | $1.99 | one-time |
| 300 Diamonds | $4.99 | one-time |
| 680 Diamonds | $9.99 | one-time |
| 1280  Diamonds | $19.99 | one-time |

**What reviewers like**

- 👍 Nice app
- 🚀 Awesome app
- 💡 Good app idea
- 👍 Helpful for learning
- 👍 Useful for teachers

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Unstable app
- 🐛 Buggy app
- 🐛 App doesn't work
- 🔧 Needs improvements

**Reported bugs**

- App crashes when opening experiments or circuits
- Wires don't attach properly
- Objects fall through the table
- Camera position issues
- App freezes or becomes unresponsive

**Requested features**

- Add more components like transistors and potentiometers
- Improve camera controls and view options
- Implement saving and loading of circuits
- Add more tutorials and explanations
- Support for Vietnamese and other languages


## Frequently asked questions

### Is Radioactive Decay Simulator free?

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

### Is Physics Lab AR free?

Physics Lab AR is free to download, with in-app purchases available.

### Which has better reviews, Radioactive Decay Simulator or Physics Lab AR?

Physics Lab AR is rated higher. Radioactive Decay Simulator averages 4.0 out of 5 from 1 ratings, while Physics Lab AR averages 4.7 from 1.9K ratings.

### Do Radioactive Decay Simulator or Physics Lab AR have ads?

Neither Radioactive Decay Simulator nor Physics Lab AR shows ads.

### Which is updated more often, Radioactive Decay Simulator or Physics Lab AR?

Radioactive Decay Simulator ships an update every 17 months, and Physics Lab AR every 2 months. Most recently, Radioactive Decay Simulator was updated on November 1, 2026 and Physics Lab AR on November 6, 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.*