# TDF Calculator vs RO Toolbox

The clearest difference is review sentiment: TDF Calculator at 67% against RO Toolbox's 0%. TDF Calculator also leads on rating (5.0 vs 4.5) and update cadence (every 3 weeks vs every 3 months). RO Toolbox's advantage is ratings volume (4 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

TDF Calculator holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 1 and 4 respectively. Written reviews point the same way: 67% of TDF Calculator's written reviews are positive against 0% of RO Toolbox's.

TDF Calculator ships an update every 3 weeks, RO Toolbox every 3 months. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | TDF Calculator | RO Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tdf-calculator/id900087159/reviews)** | [4.5 (4 ratings)](https://appshunter.io/ios/app/ro-toolbox/id968361326/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free | Free |
| Size | 14 MB | 80 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Hiroyuki KATOH](https://appshunter.io/developer/898546586) | [Radiation Oncology Institute](https://appshunter.io/developer/968361325) |

## What reviewers say

### TDF Calculator

[App page](https://appshunter.io/ios/app/tdf-calculator/id900087159)

This app simplifies the calculation of normal tissue tolerance dose in radiotherapy using the TDF factor. It offers an easy-to-use interface for radiation oncology professionals to quickly obtain results and understand the impact of fractionation on different tissues.

**Highlights:** Calculates TDF factors for normal tissue tolerance dose, Supports two TDF factor versions (1973 and 1986), Calculates TDF factors for three different conditions simultaneously, Automatically sums TDF factors, Calculates related total or fraction dose, Organizable with URL scheme

**Features:** macOS Compatibility

**In-app purchases:** none


### RO Toolbox

[App page](https://appshunter.io/ios/app/ro-toolbox/id968361326)

A point-of-care resource for healthcare professionals, offering frequently accessed references for radiation therapy delivery. It includes dose constraints, calculators, clinical practice guidelines, and staging information to support evidence-based practice.

**Highlights:** Dose constraints, Calculators, Clinical practice guidelines, Staging information, Oncology resources, Evidence-based practice support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TDF Calculator free?

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

### Is RO Toolbox free?

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

### Which has better reviews, TDF Calculator or RO Toolbox?

TDF Calculator is rated higher. TDF Calculator averages 5.0 out of 5 from 1 ratings, while RO Toolbox averages 4.5 from 4 ratings.

### Do TDF Calculator or RO Toolbox have ads?

Neither TDF Calculator nor RO Toolbox shows ads.

### Which is updated more often, TDF Calculator or RO Toolbox?

TDF Calculator ships an update every 3 weeks, and RO Toolbox every 3 months. Most recently, TDF Calculator was updated on September 9, 2026 and RO Toolbox on June 1, 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.*