Isotope Browser vs Decay Tree
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Isotope Browser
Access comprehensive nuclear data for over 4,000 nuclides and isomers. Explore interactive charts, filter by various criteria, and view detailed information for each nuclide. Data is sourced from reliable resources and available offline.
- Properties of over 4,000 nuclides and isomers
- Interactive Chart of Nuclides
- Periodic Table of Elements
- Filter by half-life, decay mode, radiation type, and energy
- Detailed nuclide information with web links
- Offline access to embedded database
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Provided by the Nuclear Data Section of the International Atomic Energy Agency, the app gives properties of more than 4 000 nuclides and isomers. A Chart of Nuclides, with zooming and tapping enabled, and a Periodic Table of Elements are included to allow easy selection and navigation. Filter criteria on half-life, decay mode, radiation type and energy can be selected. Summary data are presented in a scrolling list, with a details page for each nuclide containing web links to the data sources and further information such as level and decay schema. The filtered nuclides can be visualised on the Chart of Nuclides. Data are taken from the most recent and reliable sources, and optimal search-and-retrieve performance is achieved with an embedded database, meaning that no network connection is required.
Decay Tree
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.
- 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
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Decay Tree visualizes the whole decay chain for almost any known nuclide. Decay modes and half-lives are graphically shown. In addition, details like spin, specific activity, and emitted particles are tabulated and graphed.
Screenshots
Verdict
The clearest difference is rating: Isotope Browser at 4.8 against Decay Tree's 4.1. Isotope Browser also leads on in-app purchases (none vs 2) and ads (none vs shown). Decay Tree's advantage is review sentiment (100% vs 83%). On price, device support and iOS requirement 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. Decay Tree sells 2 one-off in-app purchases. Isotope Browser asks for nothing beyond the download.
Isotope Browser holds the better App Store score, 4.8 against 4.1. Both are backed by a comparable volume of ratings — 27 and 7 respectively. Written reviews complicate that: 83% of Isotope Browser'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.
Isotope Browser ships an update every 6 weeks, Decay Tree every 11 months. The most recent releases landed on October 16, 2026 and October 13, 2026 respectively.
| Parameter | Isotope Browser | Decay Tree |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (27 ratings) — better | 4.1 (7 ratings) |
| Positive reviews | 82.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 27 — better | 7 |
| Update frequency | Every 6 weeks — better | Every 11 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 8 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | IAEA | Gustaf Holst |
Customer experience
Isotope Browser
Decay Tree
In-app purchases
Isotope Browser
No in-app purchases
Decay Tree
- Radiation Table$0.99
- Remove Ads$1.99
Questions
Is Isotope Browser free?
Is Decay Tree free?
Which has better reviews, Isotope Browser or Decay Tree?
Do Isotope Browser or Decay Tree have ads?
Which is updated more often, Isotope Browser or Decay Tree?
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