Decay Tree vs CBRNResponder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
CBRNResponder
This app offers free tools for logging, transmitting, storing, and analyzing environmental monitoring data. It provides a secure cloud environment for user data access and requires registration for full functionality.
- Environmental data logging
- Data transmission capabilities
- Secure cloud data storage
- Data analysis tools
- Data presentation features
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CBRNResponder provides free software tools for logging, transmitting, storing, analyzing, and presenting environmental radiological, chemical, and biological monitoring data. Data is stored in a secure cloud environment accessible only by the user. To register for an account and to obtain further information, please go to www.CBRNresponder.net
Screenshots
Verdict
The clearest difference is in-app purchases: CBRNResponder at none against Decay Tree's 2. CBRNResponder also leads on ads (none vs shown) and update cadence (weekly vs every 11 months). Decay Tree's advantage is iOS requirement (12.0 vs 15.6). On price, ratings volume and device support 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. CBRNResponder asks for nothing beyond the download.
CBRNResponder holds the better App Store score, 4.5 against 4.1. Both are backed by a comparable volume of ratings — 7 and 6 respectively.
Decay Tree ships an update every 11 months, CBRNResponder weekly. The most recent releases landed on October 13, 2026 and October 3, 2026 respectively.
| Parameter | Decay Tree | CBRNResponder |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (7 ratings) | 4.5 (6 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | 6 |
| Update frequency | Every 11 months | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 53 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Gustaf Holst | Attainx Inc. |
Customer experience
Decay Tree
CBRNResponder
In-app purchases
Decay Tree
- Radiation Table$0.99
- Remove Ads$1.99
CBRNResponder
No in-app purchases
Questions
Is Decay Tree free?
Is CBRNResponder free?
Which has better reviews, Decay Tree or CBRNResponder?
Do Decay Tree or CBRNResponder have ads?
Which is updated more often, Decay Tree or CBRNResponder?
Other comparisons
