# Decay Tree vs Atomizer AR

The clearest difference is ads: Atomizer AR at none against Decay Tree's shown. Atomizer AR also leads on update cadence (every 4 weeks vs every 11 months). Decay Tree's advantage is iOS requirement (12.0 vs 15.2). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Decay Tree sells 2 one-off in-app purchases and Atomizer AR sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.1 for Decay Tree against 4.0 for Atomizer AR. Both are backed by a comparable volume of ratings — 7 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Decay Tree ships an update every 11 months, Atomizer AR every 4 weeks. The most recent releases landed on October 13, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Decay Tree | Atomizer AR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (7 ratings)](https://appshunter.io/ios/app/decay-tree/id1066023546/reviews)** | [4.0 (3 ratings)](https://appshunter.io/ios/app/atomizer-ar-quantum-chemistry/id6449015706/reviews) |
| Number of ratings | **7** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 11 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 53 MB | 132 MB |
| Requires iOS | **12.0** | 15.2 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Gustaf Holst](https://appshunter.io/developer/1066023545) | [Wonmo Seong](https://appshunter.io/developer/1625011193) |

## What reviewers say

### Decay Tree

[App page](https://appshunter.io/ios/app/decay-tree/id1066023546)

This educational app visually represents nuclear decay chains for various nuclides. It graphically displays decay modes and half-lives, alongside detailed tables and graphs of spin, specific activity, and emitted particles.

**Highlights:** Visualizes decay chains, Graphical display of decay modes, Graphical display of half-lives, Tabulated details of spin, specific activity, emitted particles, Graphs of spin, specific activity, emitted particles

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Radiation Table | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |


### Atomizer AR

[App page](https://appshunter.io/ios/app/atomizer-ar-quantum-chemistry/id6449015706)

Explore the quantum world with interactive 3D models of atoms and molecules in augmented reality. Visualize atomic and molecular orbitals, and sketch organic compounds to instantly generate their nomenclature.

**Highlights:** 3D atomic and molecular orbital visualization, Augmented reality integration, Hartree-Fock computational method for MOs, Sketch organic compounds, Automatic SMILES and IUPAC nomenclature generation

**Features:** Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Californium Pass | $1.99 | per month |
| Californium Pass | $2.99 | per month |
| Einsteinium Pass | $3.99 | per year |
| Einsteinium Pass | $6.99 | per month |


## Frequently asked questions

### Is Decay Tree free?

Decay Tree is free to download, with in-app purchases available.

### Is Atomizer AR free?

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

### Which has better reviews, Decay Tree or Atomizer AR?

Decay Tree is rated higher. Decay Tree averages 4.1 out of 5 from 7 ratings, while Atomizer AR averages 4.0 from 3 ratings.

### Do Decay Tree or Atomizer AR have ads?

Decay Tree shows ads; Atomizer AR does not.

### Which is updated more often, Decay Tree or Atomizer AR?

Decay Tree ships an update every 11 months, and Atomizer AR every 4 weeks. Most recently, Decay Tree was updated on October 13, 2026 and Atomizer AR on October 15, 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.*