Comparison

Isotope Browser vs Decay Tree

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

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
Read full description

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

Isotope Browser4 screens
Decay Tree4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Decay Tree sells 2 one-off in-app purchases. Isotope Browser asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Isotope Browser versus Decay Tree: the parameters behind the verdict, then further details
ParameterIsotope BrowserDecay Tree
PriceFreeFree
Rating4.8 (27 ratings) — better4.1 (7 ratings)
Positive reviews82.6% of reviews100.0% of reviews — better
Number of ratings27 — better7
Update frequencyEvery 6 weeks — betterEvery 11 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size8 MB53 MB
Age rating4+4+
DeveloperIAEAGustaf Holst

Customer experience

Isotope Browser

All ratings27 ratings
Positive92.6%
Neutral3.7%
Negative3.7%
Written reviews23 reviews
Positive82.6%
Neutral13.0%
Negative4.3%

Decay Tree

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Isotope Browser

No in-app purchases

2 purchases

Decay Tree

One-time2
  • Radiation Table$0.99
  • Remove Ads$1.99

Questions

Is Isotope Browser free?
Isotope Browser is free to download, with no in-app purchases.
Is Decay Tree free?
Decay Tree is free to download, with in-app purchases available.
Which has better reviews, Isotope Browser or Decay Tree?
Isotope Browser is rated higher. Isotope Browser averages 4.8 out of 5 from 27 ratings, while Decay Tree averages 4.1 from 7 ratings.
Do Isotope Browser or Decay Tree have ads?
Decay Tree shows ads; Isotope Browser does not.
Which is updated more often, Isotope Browser or Decay Tree?
Isotope Browser ships an update every 6 weeks, and Decay Tree every 11 months. Most recently, Isotope Browser was updated on October 16, 2026 and Decay Tree on October 13, 2026.

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