Diagnosaurus® DDx vs MobilEM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
Read full descriptionHide 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
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.
- 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
Read full descriptionHide 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
Verdict
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
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.
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.
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.
| Parameter | Diagnosaurus® DDx | MobilEM |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (2.5K ratings) — better | 3.6 (39 ratings) |
| Positive reviews | 53.2% of reviews — better | 45.0% of reviews |
| Number of ratings | 2.5K — better | 39 |
| Update frequency | Every 10 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | #59 — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 19 MB | 205 MB |
| Age rating | 17+ | 17+ |
| Developer | Unbound Medicine, Inc. | Emergency Medicine Residents' Association |
Customer experience
Diagnosaurus® DDx
MobilEM
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
Diagnosaurus® DDx
- Diagnosaurus DDx$4.99
MobilEM
- Ventilator Mgmt. Subscription$1.991 Year
- Pediatric Qwic$1.991 Year
- MobilEm Airway Management$4.991 Year
Show 9 moreShow fewer
- 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








