# NuklidCalc vs Decay Lab

The clearest difference is update cadence: Decay Lab at every 4 days against NuklidCalc's every 12 months. NuklidCalc's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NuklidCalc ships an update every 12 months, Decay Lab every 4 days. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | NuklidCalc | Decay Lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/decay-lab/id6746874842/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 4 days** |
| Size | 15 MB | 6 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bundesamt für Gesundheit BAG](https://appshunter.io/developer/557143322) | [Carlos Uribe](https://appshunter.io/developer/1818871232) |

## What reviewers say

### NuklidCalc

[App page](https://appshunter.io/ios/app/nuklidcalc/id6463144495)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decay Lab

[App page](https://appshunter.io/ios/app/decay-lab/id6746874842)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is NuklidCalc free?

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

### Is Decay Lab free?

Decay Lab is free to download, with no in-app purchases.

### Do NuklidCalc or Decay Lab have ads?

Neither NuklidCalc nor Decay Lab shows ads.

### Which is updated more often, NuklidCalc or Decay Lab?

NuklidCalc ships an update every 12 months, and Decay Lab every 4 days. Most recently, NuklidCalc was updated on October 11, 2026 and Decay Lab on October 25, 2026.

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