# TDF Calc vs RO Toolbox

The clearest difference is review sentiment: TDF Calc at 100% against RO Toolbox's 0%. TDF Calc also leads on rating (5.0 vs 4.5) and iOS requirement (13.2 vs 15.6). RO Toolbox's advantage is update cadence (every 3 months vs every 67 months) and 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 Calc 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: 100% of TDF Calc's written reviews are positive against 0% of RO Toolbox's.

TDF Calc ships an update every 67 months, RO Toolbox every 3 months. The most recent releases landed on June 5, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | TDF Calc | RO Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tdf-calc/id312749340/reviews)** | [4.5 (4 ratings)](https://appshunter.io/ios/app/ro-toolbox/id968361326/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 67 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 2 MB | 80 MB |
| Requires iOS | **13.2** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Eye Physics](https://appshunter.io/developer/312749343) | [Radiation Oncology Institute](https://appshunter.io/developer/968361325) |

## What reviewers say

### TDF Calc

[App page](https://appshunter.io/ios/app/tdf-calc/id312749340)

This app calculates the biologically effective dose (BED) for radiation therapy fractionation regimens. It allows for comparisons of different treatment schedules and helps determine dose per fraction based on desired treatment duration.

**Highlights:** Linear-quadratic (LQ) method implementation, Biologically effective dose (BED) calculation, External beam radiation therapy (EBRT) fractionation, Low dose rate (LDR) brachytherapy, Permanent implant brachytherapy, Dose per fraction calculation

**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 Calc free?

TDF Calc 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 Calc or RO Toolbox?

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

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

Neither TDF Calc nor RO Toolbox shows ads.

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

TDF Calc ships an update every 67 months, and RO Toolbox every 3 months. Most recently, TDF Calc was updated on June 5, 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.*