# Decay calc

> Calculates radioactive isotope decay over time using half-life. (iPhone/iPad app by Alexey Baranov.)

- Source: https://appshunter.io/ios/app/decay-calc/id1479526735 (this page in markdown: same URL + `.md`)
- Developer: [Alexey Baranov](https://appshunter.io/developer/1479526734)
- Category: Utilities
- Price: Free with in-app purchases
- Rating: 1.00/5 from 1 App Store ratings · 4 written reviews indexed
- Age rating: 17+
- Requires: iOS 15.2 · 27 MB
- Languages: English
- Released: 2019-09-13
- Data updated: 2026-06-05
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/decay-calc/id1479526735/reviews.md

## What is Decay calc?

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.

## Key features

- Radioactive isotope decay calculation
- Half-life integration
- Activity prediction
- Decay constant determination
- Radiation dose calculation

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Radio calc | $0.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/decay-calc/id1479526735/reviews.md

### 1/5 — Only preset Isotopes (many missing or locked)

*2021-11-23*

Ac-225 is not available… why isn’t it possible to define Isotopes?
Useless App!

### 2/5 — Так себе

*2020-10-26*

А с каких это пор активность в Зивертах и Рентгенах измеряется? За 75-то рублей можно было бы вкладку dose rate создать. Неплохо бы добавить кБк и МБк и Кюри.

### 5/5 — Лучшее приложение

*2020-07-10*

Одно из лучших приложений в своём роде

### 5/5 — Good app for engineers

*2020-05-02*

I’ve been searching for long time for application like this. Big list of isotopes, convenient interface. Great for engineers. Thanks!

## Frequently asked questions about Decay calc

### What is Decay calc?

Decay calc is a utility tool designed to calculate the decay of radioactive isotopes over time. It uses the isotope's half-life to provide accurate predictions of remaining activity and can also determine the decay constant.

### What fields can use Decay calc?

Decay calc is applicable in fields such as nuclear medicine, environmental monitoring, and radiation safety. It aids in the safe handling, disposal, and understanding of radioactive materials.

### How does Decay calc help with radiation safety?

By accurately calculating isotope decay and determining the decay constant, Decay calc helps in assessing potential radiation doses. This information is crucial for ensuring the safety of individuals exposed to radioactive materials.

### What devices does Decay calc support?

Decay calc is available for iPhone and iPad devices. It is designed to run on iOS operating systems.

### What is the age rating for Decay calc?

Decay calc has an age rating of 17+. This is likely due to the scientific and potentially sensitive nature of radioactivity calculations.

### How often is Decay calc updated?

The latest version of Decay calc, 3.3, was released on April 26, 2024. This indicates that the app receives regular updates from the developer, Alexey Baranov.

### Does Decay calc have ads?

No, Decay calc does not contain advertisements. The app is free to download and use, with optional in-app purchases.

### What is the user rating for Decay calc?

Decay calc has a rating of 1.0 stars based on 1 rating. This suggests a very limited number of user reviews are available.

## Version history (last 5 releases)

### 3.3 — 2024-04-26

Added isotopes Radium-223, Thorium-227, Lead-212, Rhenium-186, Rhenium-188, Terbium-149, Hafnium-172.

### 3.2 — 2023-04-11

I hope you will like the updated design and the app will become even more user-friendly.

### 3.1 — 2023-01-16

the interface changed

### 3.0 — 2022-11-09

Ac-255 isotope added

### 2.9 — 2021-11-12

The interface has changed.

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## More apps by Alexey Baranov

- [Sonj8 Gallery](https://appshunter.io/ios/app/sonj8-gallery/id1546614887)
- [StrawberryX](https://appshunter.io/ios/app/strawberryx/id1566006060)

All apps by Alexey Baranov: https://appshunter.io/developer/1479526734

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*