DDx: Differential Diagnosis
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Description
DDx is a fast, offline differential diagnosis lookup tool — like a textbook in your pocket. Open any symptom and see a ranked list of diagnoses, with don't-miss conditions surfaced first.
Built for medical students, residents, and clinicians who want a no-frills educational reference at the bedside. In the same category as Diagnosaurus.
WHAT'S INSIDE
375 symptoms across 17 body systems
6,148 differentials, ranked by probability and urgency
Don't-miss diagnoses highlighted in red
ICD-10 codes for the most common conditions
Search by symptom name, synonym, ICD-10, or diagnosis
Generated PubMed search references on every diagnosis
Bookmark symptoms for quick recall
Unlock the workflow tools that keep you moving fast:
Five clinical scoring calculators — HEART (chest pain risk), Wells (DVT pre-test probability), PERC (PE rule-out), CURB-65 (pneumonia severity), Modified Centor (strep pharyngitis)
Reverse condition lookup — find every symptom a diagnosis can present with
Patient-context filters — age and sex chips on every symptom
All future content and feature updates included
The core differential diagnosis lookup stays free, forever.
DESIGNED FOR THE BEDSIDE
Built for iPhone and iPad with full Dark Mode — true near-black for dim wards
Triage-board layout: hairline rules, ranked numerals, urgency-only color
100% offline after install — no account, no sign-up, no tracking, no ads
Universal app: one purchase covers iPhone, iPad, and Apple Vision Pro
EDUCATIONAL REFERENCE — IMPORTANT
DDx is an educational reference. It is NOT a medical device, does NOT provide individualized medical advice, and is NOT a clinical decision support system. The content is generated from medical literature and may contain inaccuracies. Always verify against primary sources. Any clinical action remains the sole responsibility of the qualified clinician caring for the patient.
PRIVACY
DDx never collects, transmits, or stores personal data. No account. No analytics. No tracking. Bookmarks live on your device only.
LICENSE
Use of DDx is governed by Apple's Licensed Application End User License Agreement:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/