# Avenir Secours vs NuklidCalc

The clearest difference is update cadence: Avenir Secours at every 2 months against NuklidCalc's every 12 months. NuklidCalc's advantage is iOS requirement (13.0 vs 15.0). 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.

Avenir Secours ships an update every 2 months, NuklidCalc every 12 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Avenir Secours | NuklidCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 12 months |
| Size | 3 MB | 15 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Definima](https://appshunter.io/developer/527016837) | [Bundesamt für Gesundheit BAG](https://appshunter.io/developer/557143322) |

## What reviewers say

### Avenir Secours

[App page](https://appshunter.io/ios/app/avenir-secours/id1549689577)

**Features:** macOS Compatibility

**In-app purchases:** none


### NuklidCalc

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Avenir Secours free?

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

### Is NuklidCalc free?

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

### Do Avenir Secours or NuklidCalc have ads?

Neither Avenir Secours nor NuklidCalc shows ads.

### Which is updated more often, Avenir Secours or NuklidCalc?

Avenir Secours ships an update every 2 months, and NuklidCalc every 12 months. Most recently, Avenir Secours was updated on November 3, 2026 and NuklidCalc on October 30, 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.*