# Decay calc vs EKOM App

The clearest difference is in-app purchases: EKOM App at none against Decay calc's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Decay calc sells 1 one-off in-app purchase. EKOM App asks for nothing beyond the download.

Decay calc ships an update every 3 months, EKOM App every 6 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Decay calc | EKOM App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/decay-calc/id1479526735/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 6 months |
| Monetization | Free with in-app purchases | — |
| Size | 27 MB | 20 MB |
| Requires iOS | 15.2 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Alexey Baranov](https://appshunter.io/developer/1479526734) | [EKOM spol. s r. o.](https://appshunter.io/developer/1671788013) |

## What reviewers say

### Decay calc

[App page](https://appshunter.io/ios/app/decay-calc/id1479526735)

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.

**Highlights:** Radioactive isotope decay calculation, Half-life integration, Activity prediction, Decay constant determination, Radiation dose calculation

**Features:** macOS Compatibility

**In-app purchases (1)**

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


### EKOM App

[App page](https://appshunter.io/ios/app/ekom-app/id1671788011)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Decay calc free?

Decay calc is free to download, with in-app purchases available.

### Is EKOM App free?

EKOM App is free to download, with no in-app purchases.

### Do Decay calc or EKOM App have ads?

Neither Decay calc nor EKOM App shows ads.

### Which is updated more often, Decay calc or EKOM App?

Decay calc ships an update every 3 months, and EKOM App every 6 months. Most recently, Decay calc was updated on November 3, 2026 and EKOM App on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*