Decay calc vs RadexM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Decay calc
This tool calculates the decay of radioactive isotopes over time, considering half-life for accurate activity predictions. It's useful in nuclear medicine, environmental monitoring, and radiation safety for handling and disposal of materials.
- Radioactive isotope decay calculation
- Half-life integration
- Activity prediction
- Decay constant determination
- Radiation dose calculation
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Decay calc is a tool used to calculate the decay of radioactive isotopes over time. It takes into account the half-life of the isotope and allows for accurate predictions of the remaining activity of the isotope at any given time. Decay calc can be used in a variety of fields, such as nuclear medicine, environmental monitoring, and radiation safety. It can help determine the appropriate handling and disposal of radioactive materials and ensure the safety of individuals who may come into contact with them. In addition to calculating the remaining activity of the isotope, decay calc can also be used to determine the decay constant, which is a measure of the rate at which the isotope decays. This information can be used to calculate the radiation dose received by individuals who are exposed to the isotope. Overall, decay calc is a useful tool for anyone working with radioactive materials or interested in learning more about radioactivity and its effects. It provides accurate and reliable calculations that can help ensure safety and proper handling of radioactive materials.
RadexM
This utility app enhances the functionality of RADEX devices by allowing easy settings adjustments and providing a history of measurements. View your data in graphical or tabular formats after connecting via Bluetooth.
- Bluetooth device connection
- Quick settings changes
- Measurement history tracking
- Graphical data display
- Tabular data display
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The RadexM mobile application adds practical and valuable features to RADEX devices while making settings easier. Connection to devices is via Bluetooth. Right after installing the application you can quickly change the settings on the device, as well as see the history of measurements in the form of graphs or tables.
Screenshots
Verdict
The clearest difference is review sentiment: RadexM at 100% against Decay calc's 50%. RadexM also leads on rating (4.8 vs 1.0) and in-app purchases (none vs 1). Decay calc's advantage is device support (3 vs 1). On price, ads 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 calc sells 1 one-off in-app purchase. RadexM asks for nothing beyond the download.
RadexM holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: RadexM has 19 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Decay calc's written reviews are positive against 100% of RadexM's.
Decay calc ships an update every 3 months, RadexM every 3 weeks. The most recent releases landed on October 8, 2026 and October 20, 2026 respectively.
| Parameter | Decay calc | RadexM |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 4.8 (19 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 19 — better |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.2 — better | 16.0 |
| Further details — not scored | ||
| Size | 27 MB | 113 MB |
| Age rating | 17+ | 4+ |
| Developer | Alexey Baranov | KVARTA-RAD, OOO |
Customer experience
Decay calc
RadexM
In-app purchases
Decay calc
- Radio calc$0.99
RadexM
No in-app purchases
