# TDF Calculator vs SARCULATOR

The clearest difference is rating: TDF Calculator at 5.0 against SARCULATOR's 4.3. TDF Calculator also leads on update cadence (every 3 weeks vs every 6 months) and iOS requirement (8.0 vs 15.0). SARCULATOR's advantage is ratings volume (3 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 4.3. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

TDF Calculator ships an update every 3 weeks, SARCULATOR every 6 months. The most recent releases landed on September 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TDF Calculator | SARCULATOR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tdf-calculator/id900087159/reviews)** | [4.3 (3 ratings)](https://appshunter.io/ios/app/sarculator/id1052119173/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Free | Free |
| Size | 14 MB | 29 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Hiroyuki KATOH](https://appshunter.io/developer/898546586) | [DIGITAL FOREST SRL](https://appshunter.io/developer/581246108) |

## 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


### SARCULATOR

[App page](https://appshunter.io/ios/app/sarculator/id1052119173)

This medical tool provides physicians with predictive models for retroperitoneal and extremity sarcoma patients. It estimates overall survival and disease-free survival, serving as an informative resource to enhance physician predictive capabilities.

**Highlights:** Predictive models for sarcoma patients, Estimates 5-year overall survival, Estimates 5-year disease-free survival, Estimates 10-year overall survival, Estimates cumulative incidence of distant metastasis, Informative tool for physicians

**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 SARCULATOR free?

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

### Which has better reviews, TDF Calculator or SARCULATOR?

TDF Calculator is rated higher. TDF Calculator averages 5.0 out of 5 from 1 ratings, while SARCULATOR averages 4.3 from 3 ratings.

### Do TDF Calculator or SARCULATOR have ads?

Neither TDF Calculator nor SARCULATOR shows ads.

### Which is updated more often, TDF Calculator or SARCULATOR?

TDF Calculator ships an update every 3 weeks, and SARCULATOR every 6 months. Most recently, TDF Calculator was updated on September 25, 2026 and SARCULATOR on October 24, 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.*