# BED Calculator vs RTTools

The clearest difference is update cadence: RTTools at daily against BED Calculator's every 41 months. 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.

BED Calculator ships an update every 41 months, RTTools daily. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | BED Calculator | RTTools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/bed-calculator-radiotherapy/id397088240/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Daily** |
| Monetization | Free | — |
| Size | 4 MB | 26 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MARGINAL GAINS INC.](https://appshunter.io/developer/1790407458) | [TAKASHI NISHIHARA](https://appshunter.io/developer/1887765352) |

## What reviewers say

### BED Calculator

[App page](https://appshunter.io/ios/app/bed-calculator-radiotherapy/id397088240)

This tool helps radiation oncology professionals calculate Biological Effective Dose (BED) and Equivalent Dose in 2 Gy fractions (EQD2) using the Linear-Quadratic model. It offers a streamlined interface for rapid dose calculations, including cumulative dose summation and fractionation conversion, and is now available on Apple Watch.

**Highlights:** Biological Effective Dose (BED) calculation, Equivalent Dose in 2 Gy fractions (EQD2) calculation, Linear-Quadratic (LQ) model, Cumulative dose summation, Fractionation conversion, Apple Watch support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### RTTools

[App page](https://appshunter.io/ios/app/rttools/id6761875910)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BED Calculator free?

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

### Is RTTools free?

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

### Do BED Calculator or RTTools have ads?

Neither BED Calculator nor RTTools shows ads.

### Which is updated more often, BED Calculator or RTTools?

BED Calculator ships an update every 41 months, and RTTools daily. Most recently, BED Calculator was updated on November 1, 2026 and RTTools 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.*