# TDF Calculator vs Rad Onc Tables

The clearest difference is price: TDF Calculator at Free against Rad Onc Tables's $9.99. TDF Calculator also leads on iOS requirement (8.0 vs 17.0). Rad Onc Tables's advantage is review sentiment (100% vs 67%) and ratings volume (23 vs 1). On rating, update cadence, ads and in-app purchases there is nothing between them.

TDF Calculator is free to download; Rad Onc Tables costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for TDF Calculator against 5.0 for Rad Onc Tables. That said, the two scores are not equally well evidenced: Rad Onc Tables has 23 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 67% of TDF Calculator's written reviews are positive against 100% of Rad Onc Tables's.

TDF Calculator ships an update every 3 weeks, Rad Onc Tables every 2 weeks. The most recent releases landed on September 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | TDF Calculator | Rad Onc Tables |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tdf-calculator/id900087159/reviews)** | [5.0 (23 ratings)](https://appshunter.io/ios/app/rad-onc-tables/id1435398887/reviews) |
| Number of ratings | 1 | **23** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#88** |
| Size | 14 MB | 49 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [Hiroyuki KATOH](https://appshunter.io/developer/898546586) | [Matthew Culbert](https://appshunter.io/developer/1435398886) |

## 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


### Rad Onc Tables

[App page](https://appshunter.io/ios/app/rad-onc-tables/id1435398887)

**Currently charting:** #88 Top Paid · Medical (US App Store)

Access concise research summaries and direct links for radiation oncology. This tool aids professionals in quickly finding and referencing relevant studies.

**Highlights:** Quick research summaries, Direct research links, Radiation oncology focus, Reference tool, Summarized findings

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

**In-app purchases:** none


## Frequently asked questions

### Is TDF Calculator free?

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

### Is Rad Onc Tables free?

Rad Onc Tables costs $9.99, with no in-app purchases.

### Which has better reviews, TDF Calculator or Rad Onc Tables?

TDF Calculator is rated higher. TDF Calculator averages 5.0 out of 5 from 1 ratings, while Rad Onc Tables averages 5.0 from 23 ratings.

### Do TDF Calculator or Rad Onc Tables have ads?

Neither TDF Calculator nor Rad Onc Tables shows ads.

### Which is updated more often, TDF Calculator or Rad Onc Tables?

TDF Calculator ships an update every 3 weeks, and Rad Onc Tables every 2 weeks. Most recently, TDF Calculator was updated on September 25, 2026 and Rad Onc Tables on October 29, 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.*