# Diagnosaurus® DDx vs DynaMed

The clearest difference is in-app purchases: DynaMed at none against Diagnosaurus® DDx's 1. DynaMed also leads on update cadence (every 5 weeks vs every 10 months). Diagnosaurus® DDx's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 18.4). On price, rating, review sentiment and ratings volume there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.8 for Diagnosaurus® DDx against 4.9 for DynaMed. Both are backed by a comparable volume of ratings — 2.5K and 3.5K respectively. Written reviews are what separate them: 53% of Diagnosaurus® DDx's written reviews are positive against 56% of DynaMed's.

Diagnosaurus® DDx ships an update every 10 months, DynaMed every 5 weeks. Both last shipped on September 24, 2026.

## The numbers

| Metric | Diagnosaurus® DDx | DynaMed |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (2.5K ratings)](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews) | **[4.9 (3.5K ratings)](https://appshunter.io/ios/app/dynamed/id986105980/reviews)** |
| Number of ratings | 2.5K | **3.5K** |
| Positive reviews | 53.2% of reviews | **55.6% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 18 MB | 37 MB |
| Requires iOS | **15.0** | 18.4 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [EBSCO Publishing](https://appshunter.io/developer/433269590) |

## What reviewers say

### 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


### DynaMed

[App page](https://appshunter.io/ios/app/dynamed/id986105980)

This tool provides clinicians with efficient, evidence-based patient care guidance. It offers timely analysis and synthesis of medical literature, updated daily by medical professionals. Mobile access ensures continuous work with syncing between desktop and mobile devices.

**Highlights:** Evidence-based patient care guidance, Daily medical literature review, Objective analysis and synthesis, Physician-authored content, Mobile access with syncing, On-the-go clinical support

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Concise and organized information
- 🚀 More up-to-date than UpToDate
- 🚀 Comprehensive and evidence-based
- 👍 User-friendly interface
- 👍 Valuable point-of-care tool

**What reviewers complain about**

- 🐛 Crashes and bugs after updates
- 🐛 Frequent login issues
- 🐛 Downloading and storage issues
- 🐛 Clunky UI, not optimized for larger screens
- 🐛 Search function glitches

**Reported bugs**

- App crashes on iOS 14 update
- Downloading content gets stuck in loop
- Search function not working properly
- Frequent login issues
- App not opening on some devices

**Requested features**

- Dark mode option
- Improved search functionality
- Better organization of content
- More patient education resources
- Smoother offline access and content management


## Frequently asked questions

### Is Diagnosaurus® DDx free?

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

### Is DynaMed free?

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

### Which has better reviews, Diagnosaurus® DDx or DynaMed?

DynaMed is rated higher. Diagnosaurus® DDx averages 4.8 out of 5 from 2.5K ratings, while DynaMed averages 4.9 from 3.5K ratings.

### Do Diagnosaurus® DDx or DynaMed have ads?

Neither Diagnosaurus® DDx nor DynaMed shows ads.

### Which is updated more often, Diagnosaurus® DDx or DynaMed?

Diagnosaurus® DDx ships an update every 10 months, and DynaMed every 5 weeks. Most recently, Diagnosaurus® DDx was updated on September 24, 2026 and DynaMed 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.*