USPSTF Prevention TaskForce vs TDF Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
USPSTF Prevention TaskForce
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.
- Access USPSTF recommendations
- Search by patient characteristics
- Identify screening services
- Find counseling services
- Discover preventive medications
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The Prevention TaskForce (formerly ePSS) is an application designed and developed by the U.S. Department of Health & Human Services (HHS), Agency for Healthcare Research and Quality (AHRQ), the Nation's lead Federal agency for research on health care quality, costs, outcomes and patient safety. It was developed by AHRQ to support the independent U.S. Preventive Services Task Force (USPSTF). The USPSTF is an independent, volunteer panel of national experts in prevention and evidence-based medicine. AHRQ provides support to the USPSTF. The Prevention TaskForce application was developed to assist primary care clinicians identify the screening, counseling, and preventive medication services that are appropriate for their patients. The Prevention TaskForce information is based on the current recommendations of the U.S. Preventive Services Task Force (USPSTF) and can be searched by specific patient characteristics, such as age, sex, and selected behavioral risk factors. When using this tool please read the specific recommendation to determine if the preventive service is appropriate for your patient. This tool is not meant to replace clinical judgment and individualized patient care. *Application downloads and data updates require internet connectivity
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.
Screenshots
Verdict
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.
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.
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.
| Parameter | USPSTF Prevention TaskForce | TDF Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (70 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 64.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 70 — better | 1 |
| Update frequency | Every 3 months — better | Every 67 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.0 | 13.2 — better |
| Further details — not scored | ||
| Size | 15 MB | 2 MB |
| Age rating | +4 | 4+ |
| Developer | AHRQ | Eye Physics |
Customer experience
USPSTF Prevention TaskForce
TDF Calc
Bugs and requests
USPSTF Prevention TaskForce
Reported bugs
9 issues- App crashes on startup
- Recommendations are broken/inaccurate
- App not compatible with recent iOS updates
- Menu won't stay open
- Unable to download
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- Recommendations won't load
- Non-functioning links
- Does not filter correctly
- Resets everything when going back to home page
Requested features
6 requests- Update recommendations
- Add more units of measurement (kg/meters)
- Update for dark mode
- Improve UI/UX
- Add more diseases to profile
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- Faster loading times
TDF Calc
Not enough reviews yet to summarise bugs or requests.
In-app purchases
USPSTF Prevention TaskForce
No in-app purchases
TDF Calc
No in-app purchases
Questions
Is USPSTF Prevention TaskForce free?
Is TDF Calc free?
Which has better reviews, USPSTF Prevention TaskForce or TDF Calc?
Do USPSTF Prevention TaskForce or TDF Calc have ads?
Which is updated more often, USPSTF Prevention TaskForce or TDF Calc?
Other comparisons
