# TDF Calc vs ESTRO 2026

The clearest difference is review sentiment: TDF Calc at 100% against ESTRO 2026's 0%. TDF Calc also leads on iOS requirement (13.2 vs 15.5). ESTRO 2026's advantage is update cadence (weekly vs every 67 months). 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 ships an update every 67 months, ESTRO 2026 weekly. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | TDF Calc | ESTRO 2026 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tdf-calc/id312749340/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 67 months | **Weekly** |
| Monetization | Free | Free |
| Size | 2 MB | 100 MB |
| Requires iOS | **13.2** | 15.5 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Eye Physics](https://appshunter.io/developer/312749343) | [CYIM](https://appshunter.io/developer/394180060) |

## 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


### ESTRO 2026

[App page](https://appshunter.io/ios/app/estro-2026/id1614477899)

Access the full program, engage during sessions, and view posters for a leading radiation oncology congress. This app facilitates learning, collaboration, and connection within the medical community.

**Highlights:** Access congress program, Interact during sessions, Watch session replays, View posters, Connect with community

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

**In-app purchases:** none


## Frequently asked questions

### Is TDF Calc free?

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

### Is ESTRO 2026 free?

ESTRO 2026 is free to download, with no in-app purchases.

### Do TDF Calc or ESTRO 2026 have ads?

Neither TDF Calc nor ESTRO 2026 shows ads.

### Which is updated more often, TDF Calc or ESTRO 2026?

TDF Calc ships an update every 67 months, and ESTRO 2026 weekly. Most recently, TDF Calc was updated on October 14, 2026 and ESTRO 2026 on October 20, 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.*