# TDF Calc vs ICCR

The clearest difference is update cadence: ICCR at every 33 months against TDF Calc's every 67 months. TDF Calc's advantage is iOS requirement (13.2 vs 15.6). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. 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 Calc against 5.0 for ICCR. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

TDF Calc ships an update every 67 months, ICCR every 33 months. The most recent releases landed on June 5, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | TDF Calc | ICCR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/tdf-calc/id312749340/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/iccr/id717358930/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 67 months | **Every 33 months** |
| Monetization | Free | Free |
| Size | 2 MB | 37 MB |
| Requires iOS | **13.2** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Eye Physics](https://appshunter.io/developer/312749343) | [ORAU](https://appshunter.io/developer/630626943) |

## 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


### ICCR

[App page](https://appshunter.io/ios/app/iccr/id717358930)

This reference tool provides information on internal contamination with radionuclides and their medical countermeasures. It estimates reference concentrations in urine based on hypothetical patient scenarios and standard biokinetic models. The app is designed for professionals interested in radioactive material contamination and therapy.

**Highlights:** Radionuclide and medical countermeasure reference information, Hypothetical patient scenario assessments, Reference concentration estimation in urine, Save, edit, and share assessments, Information on internal contamination and therapy

**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 ICCR free?

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

### Which has better reviews, TDF Calc or ICCR?

TDF Calc and ICCR are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do TDF Calc or ICCR have ads?

Neither TDF Calc nor ICCR shows ads.

### Which is updated more often, TDF Calc or ICCR?

TDF Calc ships an update every 67 months, and ICCR every 33 months. Most recently, TDF Calc was updated on June 5, 2026 and ICCR on September 9, 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.*