Comparison

Diagnosaurus® DDx vs MobilEM

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

MobilEM

Provides fast, evidence-based clinical guidance for emergency medicine professionals. Access updated recommendations on a wide range of topics, including antibiotics, toxicology, and critical care. Offers free content, individual purchases, and an all-access subscription.

Highlights
  • Evidence-based recommendations
  • Antibiotic and toxicology guidance
  • EKG and orthopedic injury protocols
  • Airway and pediatric emergency management
  • Critical care medication information
  • Fast navigation and universal search
  • Bookmarking and note-taking
Features
Currently charting
Read full description

One of our greatest privileges at EMRA is offering resources that can help make every clinical shift easier, through evidence-based guidance in your pocket. Get updated recommendations for antibiotics, toxicology, EKGs, orthopedic injuries, airway management, pediatric emergencies, splinting, critical care medications, and more. Enjoy free content, purchase our resources a la carte, or subscribe to our all-access pass (best value!) to take full advantage of these key features: • Fast, easy navigation • Powerful universal search • Bookmarking • Note-taking fields • Continual updates that require no action on your part We hope you find MobilEM to be useful; check back often, as we will be adding new content on a regular basis. Please note: EMRA is committed to your privacy. See our policy at https://www.emra.org/about-emra/privacy-policy/. Terms of Use: This and all other digital reference content, including all content offered under subscription is intended for a single user on devices belonging to that user. Use of this app running on a common device shared by an organization is disallowed. For further information on terms of use and EULA please see: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ This app is intended for the US healthcare market.

Screenshots

Diagnosaurus® DDx4 screens
MobilEM4 screens

Verdict

The call

The clearest difference is rating: Diagnosaurus® DDx at 4.8 against MobilEM's 3.6. Diagnosaurus® DDx also leads on ratings volume (2.5K vs 39) and review sentiment (53% vs 45%). MobilEM's advantage is update cadence (every 2 months vs every 10 months) and chart position (#59 vs unranked). On price, ads, in-app purchases and monetization model 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 and MobilEM sells 12 in-app purchases, starting at $1.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Diagnosaurus® DDx holds the better App Store score, 4.8 against 3.6. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 39, so its average is the more settled of the two. Written reviews point the same way: 53% of Diagnosaurus® DDx's written reviews are positive against 45% of MobilEM's.

UpkeepUpdate frequency

Diagnosaurus® DDx ships an update every 10 months, MobilEM every 2 months. The most recent releases landed on October 22, 2026 and October 21, 2026 respectively.

Scorecard5 real differences · 6 level
Diagnosaurus® DDx versus MobilEM: the parameters behind the verdict, then further details
ParameterDiagnosaurus® DDxMobilEM
PriceFreeFree
Rating4.8 (2.5K ratings) — better3.6 (39 ratings)
Positive reviews53.2% of reviews — better45.0% of reviews
Number of ratings2.5K — better39
Update frequencyEvery 10 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank—#59 — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size19 MB205 MB
Age rating17+17+
DeveloperUnbound Medicine, Inc.Emergency Medicine Residents' Association

Customer experience

Diagnosaurus® DDx

All ratings2,500 ratings
Positive96.2%
Neutral1.6%
Negative2.2%
Written reviews77 reviews
Positive53.2%
Neutral2.6%
Negative44.2%

MobilEM

All ratings39 ratings
Positive61.5%
Neutral10.3%
Negative28.2%
Written reviews20 reviews
Positive45.0%
Neutral15.0%
Negative40.0%

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

MobilEM

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Diagnosaurus® DDx

One-time1
  • Diagnosaurus DDx$4.99
12 purchases

MobilEM

Subscriptions12
  • Ventilator Mgmt. Subscription$1.991 Year
  • Pediatric Qwic$1.991 Year
  • MobilEm Airway Management$4.991 Year
Show 9 more
  • Trauma Guide$4.991 Year
  • Antibiotic Guide Subscription$9.991 Year
  • MobilEm Ortho Guide$9.991 Year
  • MobilEM Tox Guide$9.991 Year
  • PressorDex$9.991 Year
  • EKG Guide Subscription$9.991 Year
  • Pain Management$9.991 Year
  • PEM Fundamentals Subscription$9.991 Year
  • MobilEm All Access Pass1 Month trial$39.991 Year

Questions

Is Diagnosaurus® DDx free?
Diagnosaurus® DDx is free to download, with in-app purchases available.
Is MobilEM free?
MobilEM is free to download, with in-app purchases available.
Which has better reviews, Diagnosaurus® DDx or MobilEM?
Diagnosaurus® DDx is rated higher. Diagnosaurus® DDx averages 4.8 out of 5 from 2.5K ratings, while MobilEM averages 3.6 from 39 ratings.
Do Diagnosaurus® DDx or MobilEM have ads?
Neither Diagnosaurus® DDx nor MobilEM shows ads.
Which is updated more often, Diagnosaurus® DDx or MobilEM?
Diagnosaurus® DDx ships an update every 10 months, and MobilEM every 2 months. Most recently, Diagnosaurus® DDx was updated on October 22, 2026 and MobilEM on October 21, 2026.

Other comparisons