WorstFirst
Medical
Free · Designed for iPad. Not verified for macOS.
WorstFirst is a decision-tree training tool for emergency medicine trainees, built by a practicing emergency physician.
Emergency medicine runs on one discipline: rule out the killers first. WorstFirst trains that instinct. Pick a chief complaint and work through a structured decision tree — the same worst-first reasoning used at the bedside — before settling on the benign explanation.
WHAT'S INSIDE
- 29 chief-complaint decision trees spanning cardiovascular, respiratory, neurologic, abdominal, trauma, tox, and more
- Branch-by-branch reasoning with teaching pearls and common pitfalls
- Citations to landmark literature and current guidelines throughout
- Fully offline — no account, no sign-in, no data collection
WHO IT'S FOR
Medical students, EM residents, and other healthcare trainees building their approach to undifferentiated complaints.
FOR EDUCATIONAL USE ONLY
WorstFirst is an educational reference. It is not a medical device and is not intended to diagnose, treat, or guide the care of any patient. It must not be used for clinical decision-making. All content is for learning purposes only and does not replace clinical judgment, institutional protocols, current guidelines, or attending supervision.
New: 10 pediatric pathways (fever, abdominal pain, testicular pain, vomiting, headache, limp, respiratory distress, rash, altered mental status, syncope). Improved adult pathways and references.
The developer, Injexa Technologies LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Injexa Technologies LLC
- Size
- 2.4 MB
- Category
- Medical
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- Frequent
Medical Treatment information
Infrequent
Alcohol, Tobacco, Drug Use or References
Guns or Other Weapons
Contains
Health or Wellness Topics
- Copyright
- © 2026 Injexa Technologies LLC