TDF Calc vs GadCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TDF Calc
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.
- 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
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TDFCalc is an application which implements the linear-quadratic (LQ) method for comparing the biologically effective dose (BED) of external beam radiation therapy (EBRT) fractionation regimens as well as low dose rate (LDR) and permanent implant brachytherapy treatments. It calculates BED for a given alpha/beta ratio as a function of the dose per fraction and number of fractions for EBRT, and initial dose rate for brachytherapy. For a predetermined BED, the app solves the quadratic equation to calculate dose per fraction as a function of the number of fractions desired. This enables quick comparison of modified fractionation regimens (e.g. hypofractionation or compensating for missing treatment fractions) vs a conventional and/or originally intended regimen.
GadCalc
This medical app assists with calculating MRI contrast agent doses. It provides access to package inserts and lists standard and specific doses for FDA-approved agents. It's a convenient tool for healthcare professionals.
- Calculate MRI contrast agent dose
- View contrast agent package inserts
- Access online and offline inserts
- Look up standard doses
- Find University of Wisconsin specific doses
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The University of Wisconsin Gadolinium Calculator (GadCalc) app is an easy and convenient way to help you: • Calculate MRI contrast agent dose • View package inserts for contrast agents, either online or offline • Look up standard, and University of Wisconsin specific, doses for all FDA approved contrast agents If you have questions, problems or feedback, please reach us at radweb@uwhealth.org
Screenshots
Verdict
The clearest difference is update cadence: GadCalc at every 18 months against TDF Calc's every 67 months. On price, rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 GadCalc. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
TDF Calc ships an update every 67 months, GadCalc every 18 months. The most recent releases landed on June 5, 2026 and September 10, 2026 respectively.
| Parameter | TDF Calc | GadCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 67 months | Every 18 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.2 | 12.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 9 MB |
| Age rating | 4+ | 17+ |
| Developer | Eye Physics | University of Wisconsin-Madison Shared Apps |
Customer experience
TDF Calc
GadCalc
In-app purchases
TDF Calc
No in-app purchases
GadCalc
No in-app purchases
