# EQD2 Calculator vs CritiCalc

The clearest difference is iOS requirement: EQD2 Calculator at 10.0 against CritiCalc's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

EQD2 Calculator ships an update monthly, CritiCalc every 2 weeks. The most recent releases landed on October 9, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | EQD2 Calculator | CritiCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/eqd2-calculator/id1200344433/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 17 MB | 53 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [Jon Giambattista](https://appshunter.io/developer/983771622) | [Jason Richmond](https://appshunter.io/developer/1659125082) |

## What reviewers say

### EQD2 Calculator

[App page](https://appshunter.io/ios/app/eqd2-calculator/id1200344433)

Calculate radiation dose in equivalent 2 Gy fractions and biological equivalent dose (BED). The app offers selectable alpha beta ratios for normal tissues and tumors, and includes a dose conversion mode for custom calculations.

**Highlights:** Calculate EQD2, Calculate BED, Selectable alpha beta ratios, Dose conversion mode, Custom dose per fraction calculation

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

**In-app purchases:** none


### CritiCalc

[App page](https://appshunter.io/ios/app/criticalc/id1659125080)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is EQD2 Calculator free?

EQD2 Calculator is free to download, with no in-app purchases.

### Is CritiCalc free?

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

### Do EQD2 Calculator or CritiCalc have ads?

Neither EQD2 Calculator nor CritiCalc shows ads.

### Which is updated more often, EQD2 Calculator or CritiCalc?

EQD2 Calculator ships an update monthly, and CritiCalc every 2 weeks. Most recently, EQD2 Calculator was updated on October 9, 2026 and CritiCalc on October 17, 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.*