# USPSTF Prevention TaskForce vs TDF Calc

The clearest difference is rating: TDF Calc at 5.0 against USPSTF Prevention TaskForce's 3.7. TDF Calc also leads on review sentiment (100% vs 64%) and iOS requirement (13.2 vs 18.0). USPSTF Prevention TaskForce's advantage is update cadence (every 3 months vs every 67 months) and ratings volume (70 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 Calc holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: USPSTF Prevention TaskForce has 70 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 64% of USPSTF Prevention TaskForce's written reviews are positive against 100% of TDF Calc's.

USPSTF Prevention TaskForce ships an update every 3 months, TDF Calc every 67 months. The most recent releases landed on October 23, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | USPSTF Prevention TaskForce | TDF Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (70 ratings)](https://appshunter.io/ios/app/uspstf-prevention-taskforce/id311852560/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tdf-calc/id312749340/reviews)** |
| Number of ratings | **70** | 1 |
| Positive reviews | 64.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 67 months |
| Monetization | Free | Free |
| Size | 15 MB | 2 MB |
| Requires iOS | 18.0 | **13.2** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [AHRQ](https://appshunter.io/developer/311852563) | [Eye Physics](https://appshunter.io/developer/312749343) |

## What reviewers say

### USPSTF Prevention TaskForce

[App page](https://appshunter.io/ios/app/uspstf-prevention-taskforce/id311852560)

This app provides primary care clinicians with evidence-based recommendations for preventive services. It helps identify appropriate screening, counseling, and medication services for patients based on their individual characteristics.

**Highlights:** Access USPSTF recommendations, Search by patient characteristics, Identify screening services, Find counseling services, Discover preventive medications

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

**In-app purchases:** none

**What reviewers like**

- 👍 Essential for primary care
- 👍 Great evidence-based resource
- 👍 Useful for students and clinicians
- 👍 Well-organized and easy to use
- 👍 Quick reference tool

**What reviewers complain about**

- 🐛 Frequent crashes
- 🐛 Outdated recommendations
- 🐛 Inaccurate/broken recommendations
- 🐛 UI needs update
- 🐛 Not working with latest iOS

**Reported bugs**

- App crashes on startup
- Recommendations are broken/inaccurate
- App not compatible with recent iOS updates
- Menu won't stay open
- Unable to download

**Requested features**

- Update recommendations
- Add more units of measurement (kg/meters)
- Update for dark mode
- Improve UI/UX
- Add more diseases to profile


### 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


## Frequently asked questions

### Is USPSTF Prevention TaskForce free?

USPSTF Prevention TaskForce is free to download, with no in-app purchases.

### Is TDF Calc free?

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

### Which has better reviews, USPSTF Prevention TaskForce or TDF Calc?

TDF Calc is rated higher. USPSTF Prevention TaskForce averages 3.7 out of 5 from 70 ratings, while TDF Calc averages 5.0 from 1 ratings.

### Do USPSTF Prevention TaskForce or TDF Calc have ads?

Neither USPSTF Prevention TaskForce nor TDF Calc shows ads.

### Which is updated more often, USPSTF Prevention TaskForce or TDF Calc?

USPSTF Prevention TaskForce ships an update every 3 months, and TDF Calc every 67 months. Most recently, USPSTF Prevention TaskForce was updated on October 23, 2026 and TDF Calc on October 14, 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.*