# Elementium vs Decay Tree

The clearest difference is ads: Elementium at none against Decay Tree's shown. Elementium also leads on rating (4.6 vs 4.1) and update cadence (every 3 weeks vs every 11 months). Decay Tree's advantage is review sentiment (100% vs 75%) and iOS requirement (12.0 vs 16.1). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Elementium sells 9 in-app purchases, starting at $1.99 per month and Decay Tree sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Elementium holds the better App Store score, 4.6 against 4.1. That said, the two scores are not equally well evidenced: Elementium has 576 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 75% of Elementium's written reviews are positive against 100% of Decay Tree's, so the app with the better star average is not the one people write more warmly about.

Elementium ships an update every 3 weeks, Decay Tree every 11 months. The most recent releases landed on October 12, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Elementium | Decay Tree |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (576 ratings)](https://appshunter.io/ios/app/elementium/id892123825/reviews)** | [4.1 (7 ratings)](https://appshunter.io/ios/app/decay-tree/id1066023546/reviews) |
| Number of ratings | **576** | 7 |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 11 months |
| Monetization | Freemium | Free with in-app purchases |
| Size | 752 MB | 53 MB |
| Requires iOS | 16.1 | **12.0** |
| Devices | iPhone, iPad, Apple TV | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Samuel Spencer](https://appshunter.io/developer/1128165856) | [Gustaf Holst](https://appshunter.io/developer/1066023545) |

## What reviewers say

### Elementium

[App page](https://appshunter.io/ios/app/elementium/id892123825)

Access comprehensive information on every element of the periodic table. Explore detailed data, visualize trends, and utilize a built-in solubility calculator. Perfect for students and professionals needing quick, accurate chemical data.

**Highlights:** Detailed element information, Interactive periodic table, Dynamic filtering and trend visualization, Solubility calculator, Element image library, Bohr model visualizations, Home screen widgets

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ION, 1 month | $1.99 | per month |
| ION, 3 Months | $3.99 | per 3 months |
| ION, 6 months | $5.99 | per 6 months |
| ION, 1 year | $9.99 | per year |
| Export Data | $0.99 | one-time |
| Bohr Models | $1.99 | one-time |
| Advanced Sorting | $2.99 | one-time |
| Visual Elements | $3.99 | one-time |
| Advanced Tools | $4.99 | one-time |

**What reviewers like**

- 👍 User-friendly and intuitive interface
- 📚 Comprehensive element information and data
- 🎨 Beautiful, clean, and visually appealing design
- 🔗 Helpful Wikipedia and external resource links
- 📖 Excellent for educational purposes and studying

**What reviewers complain about**

- 💰 Expensive subscription model for premium features
- 🔐 Paywall blocking key features and element images
- 📺 Intrusive ads and purchase prompts on startup
- 🎨 Poor color contrast on metalloid background text
- 📱 Crashes on older devices (iPhone 6G iPod Touch, iPhone XS Max)

**Reported bugs**

- App crashes on startup and when tapping elements
- Crashes on older iOS devices and iPod Touch
- Molar mass not visible in iPhone landscape orientation
- Intrusive purchase prompt that's difficult to dismiss
- Rating request spam appearing too early in user experience

**Requested features**

- Element images and visual representations
- One-time purchase option instead of subscription
- Zoom out to view entire periodic table at once
- Better display of molar mass on iPhone in landscape mode
- More detailed information and content


### 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 |


## Frequently asked questions

### Is Elementium free?

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

### Is Decay Tree free?

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

### Which has better reviews, Elementium or Decay Tree?

Elementium is rated higher. Elementium averages 4.6 out of 5 from 576 ratings, while Decay Tree averages 4.1 from 7 ratings.

### Do Elementium or Decay Tree have ads?

Decay Tree shows ads; Elementium does not.

### Which is updated more often, Elementium or Decay Tree?

Elementium ships an update every 3 weeks, and Decay Tree every 11 months. Most recently, Elementium was updated on October 12, 2026 and Decay Tree on September 28, 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.*