# Diagnosaurus® DDx vs Cortex Referral

The clearest difference is in-app purchases: Cortex Referral at none against Diagnosaurus® DDx's 1. Cortex Referral also leads on update cadence (monthly vs every 10 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Diagnosaurus® DDx ships an update every 10 months, Cortex Referral monthly. The most recent releases landed on October 20, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Diagnosaurus® DDx | Cortex Referral |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (2.5K ratings)](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews)** | — |
| Number of ratings | **2.5K** | — |
| Positive reviews | 53.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 52 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [Cortex Neurovascular South Sound PLLC](https://appshunter.io/developer/6784270587) |

## 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


### Cortex Referral

[App page](https://appshunter.io/ios/app/cortex-referral/id6790437673)

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

**In-app purchases:** none


## Frequently asked questions

### Is Diagnosaurus® DDx free?

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

### Is Cortex Referral free?

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

### Do Diagnosaurus® DDx or Cortex Referral have ads?

Neither Diagnosaurus® DDx nor Cortex Referral shows ads.

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

Diagnosaurus® DDx ships an update every 10 months, and Cortex Referral monthly. Most recently, Diagnosaurus® DDx was updated on October 20, 2026 and Cortex Referral on October 10, 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.*