# Pneumotox. vs Diagnosaurus® DDx

The clearest difference is in-app purchases: Pneumotox. at none against Diagnosaurus® DDx's 1. Diagnosaurus® DDx's advantage is ratings volume (2.5K vs 7) and update cadence (every 10 months vs every 42 months). On price, rating, review sentiment and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.9 for Pneumotox. against 4.8 for Diagnosaurus® DDx. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 7, so its average is the more settled of the two. Written reviews are what separate them: 50% of Pneumotox.'s written reviews are positive against 53% of Diagnosaurus® DDx's.

Pneumotox. ships an update every 42 months, Diagnosaurus® DDx every 10 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | Pneumotox. | Diagnosaurus® DDx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (7 ratings)](https://appshunter.io/ios/app/pneumotox/id495707401/reviews)** | [4.8 (2.5K ratings)](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews) |
| Number of ratings | 7 | **2.5K** |
| Positive reviews | 50.0% of reviews | **53.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 10 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 48 MB | 19 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 17+ |
| Developer | [Philippe Camus](https://appshunter.io/developer/1438857331) | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) |

## What reviewers say

### Pneumotox.

[App page](https://appshunter.io/ios/app/pneumotox/id495707401)

This app aids in diagnosing respiratory and cardiac diseases suspected of being drug-induced. It provides extensive information and bibliography from over 35,000 reviewed references, organized by causative drugs and respiratory patterns. It helps assess drug causality and offers diagnostic prompts.

**Highlights:** Diagnose drug-induced respiratory diseases, Extensive bibliography from 35,000+ references, Organized by causative drugs and respiratory patterns, Drug causality assessment tool, Diagnostic prompts and Naranjo scale integration, Information on various drug administration routes

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

**In-app purchases:** none


### 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 Pneumotox. free?

Pneumotox. 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, Pneumotox. or Diagnosaurus® DDx?

Pneumotox. is rated higher. Pneumotox. averages 4.9 out of 5 from 7 ratings, while Diagnosaurus® DDx averages 4.8 from 2.5K ratings.

### Do Pneumotox. or Diagnosaurus® DDx have ads?

Neither Pneumotox. nor Diagnosaurus® DDx shows ads.

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

Pneumotox. ships an update every 42 months, and Diagnosaurus® DDx every 10 months. Most recently, Pneumotox. was updated on November 6, 2026 and Diagnosaurus® DDx on November 6, 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.*