# Diagnosaurus® DDx vs PEPID®

The clearest difference is in-app purchases: PEPID® at none against Diagnosaurus® DDx's 1. PEPID® also leads on update cadence (every 5 weeks vs every 10 months). Diagnosaurus® DDx's advantage is review sentiment (53% vs 45%) and device support (4 vs 2). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.8 for Diagnosaurus® DDx against 4.7 for PEPID®. Both are backed by a comparable volume of ratings — 2.5K and 2.9K respectively. Written reviews are what separate them: 53% of Diagnosaurus® DDx's written reviews are positive against 45% of PEPID®'s.

Diagnosaurus® DDx ships an update every 10 months, PEPID® every 5 weeks. The most recent releases landed on October 17, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Diagnosaurus® DDx | PEPID® |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (2.5K ratings)](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews)** | [4.7 (2.9K ratings)](https://appshunter.io/ios/app/pepid/id955554418/reviews) |
| Number of ratings | 2.5K | **2.9K** |
| Positive reviews | **53.2% of reviews** | 45.1% 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 | 39 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [PEPID, LLC](https://appshunter.io/developer/306091996) |

## 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


### PEPID®

[App page](https://appshunter.io/ios/app/pepid/id955554418)

Provides healthcare professionals with essential tools for patient care, including a vast drug database, medical calculators, and visual aids. Content is regularly updated and clinically independent, offering reliable information for various medical roles.

**Highlights:** Largest drug database, Medical calculators, High-res pill photos, Clinical illustrations, Regularly updated information, Independent clinical content

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Quick information
- 🔒 Trustworthy content
- 👍 Useful for daily work
- 👍 Comprehensive database
- 👍 User-friendly

**What reviewers complain about**

- 🐛 App crashes/won't open
- 🐛 Outdated/missing content
- 🐛 Poor optimization for newer devices
- 💰 Expensive subscription
- 👎 Difficult to navigate

**Reported bugs**

- App crashes on login or launch
- Content fails to download
- Incompatible with newer iOS versions

**Requested features**

- Improved search functionality
- More calculators and tools
- Automatic content updates
- Ability to use on multiple devices with single subscription


## Frequently asked questions

### Is Diagnosaurus® DDx free?

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

### Is PEPID® free?

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

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

Diagnosaurus® DDx is rated higher. Diagnosaurus® DDx averages 4.8 out of 5 from 2.5K ratings, while PEPID® averages 4.7 from 2.9K ratings.

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

Neither Diagnosaurus® DDx nor PEPID® shows ads.

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

Diagnosaurus® DDx ships an update every 10 months, and PEPID® every 5 weeks. Most recently, Diagnosaurus® DDx was updated on October 17, 2026 and PEPID® on October 15, 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.*