Comparison

Diagnosaurus® DDx vs PEPID®

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Diagnosaurus® DDx

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
Read full description

** Top-Selling App Used by Tens of Thousands of Health Professionals, Worldwide ** ABOUT DIAGNOSAURUS DDX This quick-reference tool helps healthcare professionals perform differential diagnosis with speed and confidence at the point of care. With Diagnosaurus you can quickly search over 1,000 diagnoses by organ system, symptom, or disease, or you can view all entries. Use the valuable “See Related DDx” feature within each entry to consider alternative diagnoses and quickly link to those entries. The convenient “Favorites” feature allows you to save specific searches and bookmark in your personal archive. FEATURES • More than 1,000 differential diagnoses • Highlight and make custom notes within entries • Entries organized in quick-read format • “See Related DDx” links to other potential diagnoses • Disease, symptom, and organ system indexes • “Favorites” for bookmarking important entries • Universal Index Search to help find answers fast Author: Roni F. Zeiger, MD Publisher: McGraw-Hill Medical Powered by: Unbound Medicine

About

PEPID®

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
Read full description

PEPID gives healthcare professionals all the tools they need to treat patients at the scene, en route and/or by the bedside. With just a few taps, access the largest drug database on the market, medical calculators, high-res pill photos, illustrations, and much more! -- Updated regularly, so you can be sure you have the most current information available -- Independent clinical content from 12 leading healthcare associations, including the American Academy of Emergency Medicine, American College of Emergency Physicians and the Family Physicians Inquiries Network -- Suites available for physicians, nurses, students, residents, pharmacists, EMTs and paramedics, and more Have questions, issues or feedback? Contact us at support@pepid.com.

Screenshots

Diagnosaurus® DDx4 screens
PEPID®3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Diagnosaurus® DDx versus PEPID®: the parameters behind the verdict, then further details
ParameterDiagnosaurus® DDxPEPID®
PriceFreeFree
Rating4.8 (2.5K ratings) — better4.7 (2.9K ratings)
Positive reviews53.2% of reviews — better45.1% of reviews
Number of ratings2.5K2.9K — better
Update frequencyEvery 10 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size18 MB39 MB
Age rating17+17+
DeveloperUnbound Medicine, Inc.PEPID, LLC

Customer experience

Diagnosaurus® DDx

All ratings2,485 ratings
Positive96.2%
Neutral1.6%
Negative2.2%
Written reviews77 reviews
Positive53.2%
Neutral2.6%
Negative44.2%

PEPID®

All ratings2,900 ratings
Positive94.3%
Neutral1.8%
Negative3.9%
Written reviews71 reviews
Positive45.1%
Neutral2.8%
Negative52.1%

User reviews

Diagnosaurus® DDx

From 2.5K App Store ratings

What we love

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

Room to improve

  • 🐛 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

PEPID®

From 2.9K App Store ratings

What we love

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

Room to improve

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

Bugs and requests

Diagnosaurus® DDx

Reported bugs

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

Requested features

5 requests
  • 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®

Reported bugs

3 issues
  • App crashes on login or launch
  • Content fails to download
  • Incompatible with newer iOS versions

Requested features

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

In-app purchases

1 purchases

Diagnosaurus® DDx

One-time1
  • Diagnosaurus DDx$4.99
None

PEPID®

No in-app purchases

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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