Diagnosaurus® DDx vs QuickEM
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
QuickEM
This emergency medicine reference app provides clinicians with instant access to critical information, including differentials, treatments, and validated medical calculators. It's designed for rapid lookup of ED-specific care, organized by chief complaints and clinical categories, and works completely offline.
- 80+ chief complaint topics
- 90+ medical calculators
- Offline access
- No login or ads
- Adult and pediatric coverage
- Evidence-based content
- Customizable favorites
Read full descriptionHide full description
The Essential Emergency Medicine Reference Trusted by Clinicians QuickEM is the comprehensive bedside companion designed by emergency physicians for emergency physicians. Whether you're a medical student on your first ED rotation or an attending managing a busy department, QuickEM delivers the critical information you need—instantly. Built for Real Emergency Medicine • Over 80 chief complaint topics with differentials, history, tests, and treatments focused on ED-specific care • Over 90 validated medical calculators / tools • No login required • Zero fluff—only ED-relevant information Organized by How You Think • Chief complaints structured by presentation • Calculators grouped by clinical category • Smart search finds tools • Customizable favorites list for your go-to references Trusted by Every Level • Medical Students: Essential differentials and workup basics • Residents: Quick access to decision rules and scoring systems • Attendings: Rapid reference for less common presentations and 2nd brain refreshers Key Features: • Complete offline access—works without internet • No ads, no subscriptions, no account required • Covers adult and pediatric emergency medicine • Includes trauma protocols and resuscitation guides • Evidence-based content with source citations • Professional medical illustrations and ECG examples Content Highlights: • Cardiovascular: HEART Score, CHADS2-VASc, Wells Criteria • Neurological: NIHSS, Canadian Head CT Rules, HINTS Exam • Trauma: NEXUS, Canadian C-Spine, PECARN • Pediatrics: PEDS Vitals, Croup Score, Bronchiolitis • Toxicology: Rumack-Matthew, CIWA-Ar, Anion Gap • And more! Developed by practicing emergency physicians who understand what you need at 3 AM with multiple critical patients. QuickEM is designed to be the fastest way to look up the info you need. This app is designed exclusively for medical professionals and students. Not intended for patient or public use.
Screenshots
Verdict
The clearest difference is price: Diagnosaurus® DDx at Free against QuickEM's $9.99. Diagnosaurus® DDx also leads on ratings volume (2.5K vs 10) and rating (4.8 vs 4.6). QuickEM's advantage is review sentiment (91% vs 53%) and update cadence (every 2 months vs every 10 months). On ads, in-app purchases, device support and iOS requirement 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
Diagnosaurus® DDx is free to download; QuickEM costs $9.99 up front. Diagnosaurus® DDx sells 1 one-off in-app purchase and QuickEM sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Diagnosaurus® DDx holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 53% of Diagnosaurus® DDx's written reviews are positive against 91% of QuickEM's, so the app with the better star average is not the one people write more warmly about.
Diagnosaurus® DDx ships an update every 10 months, QuickEM every 2 months. Both last shipped on October 26, 2026.
| Parameter | Diagnosaurus® DDx | QuickEM |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 4.8 (2.5K ratings) — better | 4.6 (10 ratings) |
| Positive reviews | 53.2% of reviews | 90.9% of reviews — better |
| Number of ratings | 2.5K — better | 10 |
| Update frequency | Every 10 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Paid |
| Best chart rank | — | #21 — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 19 MB | 78 MB |
| Age rating | 17+ | 17+ |
| Developer | Unbound Medicine, Inc. | Dirkes Medical, PLLC |
Customer experience
Diagnosaurus® DDx
QuickEM
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
QuickEM
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Diagnosaurus® DDx
- Diagnosaurus DDx$4.99
QuickEM
- Premium Features$2.99









