# USPSTF Prevention TaskForce vs Diagnosaurus® DDx

The clearest difference is rating: Diagnosaurus® DDx at 4.8 against USPSTF Prevention TaskForce's 3.6. Diagnosaurus® DDx also leads on ratings volume (2.5K vs 68) and device support (4 vs 2). USPSTF Prevention TaskForce's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 10 months). On price and ads there is nothing between them.

Both are free to download. Diagnosaurus® DDx sells 1 one-off in-app purchase. USPSTF Prevention TaskForce asks for nothing beyond the download.

Diagnosaurus® DDx holds the better App Store score, 4.8 against 3.6. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 68, so its average is the more settled of the two. Written reviews complicate that: 63% of USPSTF Prevention TaskForce's written reviews are positive against 53% of Diagnosaurus® DDx's, so the app with the better star average is not the one people write more warmly about.

USPSTF Prevention TaskForce ships an update every 3 months, Diagnosaurus® DDx every 10 months. The most recent releases landed on September 7, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | USPSTF Prevention TaskForce | Diagnosaurus® DDx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (68 ratings)](https://appshunter.io/ios/app/uspstf-prevention-taskforce/id311852560/reviews) | **[4.8 (2.5K ratings)](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews)** |
| Number of ratings | 68 | **2.5K** |
| Positive reviews | **63.5% of reviews** | 53.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 10 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 13 MB | 18 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [AHRQ](https://appshunter.io/developer/311852563) | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) |

## 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


### Diagnosaurus® DDx

[App page](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910)

This medical reference tool assists healthcare professionals in performing differential diagnoses quickly and confidently. It offers a searchable database of over 1,000 diagnoses, cross-referenced for related conditions, and allows users to save favorite entries and make custom notes.

**Highlights:** Over 1,000 differential diagnoses, Search by organ system, symptom, or disease, See Related DDx feature, Save favorite entries, Highlight and make custom notes, Universal Index Search

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diagnosaurus DDx | $4.99 | one-time |

**What reviewers like**

- 👍 User-friendly interface
- 🚀 Quick access to differential diagnoses
- 💡 Helpful for building differential diagnoses
- 👍 Comprehensive coverage of conditions
- 👍 Useful for medical students and practitioners

**What reviewers complain about**

- 🐛 Lack of in-depth information
- 🐛 Incomplete differential diagnoses
- 🐛 Lack of links to explain conditions
- 🐛 Requires in-app purchase to access full content
- 🐛 Unreliable update mechanism

**Reported bugs**

- Subscription issues and inability to restore purchases
- Blank pages and non-functional content
- Compatibility issues with newer iOS versions

**Requested features**

- Add ability to edit or add custom differential diagnoses
- Improve search functionality and navigation
- Provide more detailed information on conditions
- Integrate with other medical resources and databases
- Improve support for older devices and iOS versions


## Frequently asked questions

### Is USPSTF Prevention TaskForce free?

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

### Is Diagnosaurus® DDx free?

Diagnosaurus® DDx is free to download, with in-app purchases available.

### Which has better reviews, USPSTF Prevention TaskForce or Diagnosaurus® DDx?

Diagnosaurus® DDx is rated higher. USPSTF Prevention TaskForce averages 3.6 out of 5 from 68 ratings, while Diagnosaurus® DDx averages 4.8 from 2.5K ratings.

### Do USPSTF Prevention TaskForce or Diagnosaurus® DDx have ads?

Neither USPSTF Prevention TaskForce nor Diagnosaurus® DDx shows ads.

### Which is updated more often, USPSTF Prevention TaskForce or Diagnosaurus® DDx?

USPSTF Prevention TaskForce ships an update every 3 months, and Diagnosaurus® DDx every 10 months. Most recently, USPSTF Prevention TaskForce was updated on September 7, 2026 and Diagnosaurus® DDx on September 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.*