Decay calc vs LDM Valves
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.
LDM Valves
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This programme is designed for calculation of Kvs/Cvs of industrial valves.
Screenshots
Verdict
The clearest difference is in-app purchases: LDM Valves at none against Decay calc's 1. On price, update cadence, ads 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 calc sells 1 one-off in-app purchase. LDM Valves asks for nothing beyond the download.
Decay calc ships an update every 3 months, LDM Valves every 5 months. The most recent releases landed on October 8, 2026 and October 17, 2026 respectively.
| Parameter | Decay calc | LDM Valves |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.2 — better | 15.3 |
| Further details — not scored | ||
| Size | 27 MB | 37 MB |
| Age rating | 17+ | 4+ |
| Developer | Alexey Baranov | LDM, spol. s r.o. |
In-app purchases
Decay calc
- Radio calc$0.99
LDM Valves
No in-app purchases
