# WorstFirst

> Emergency medicine decision-tree training tool for trainees, offline functionality. (iPhone/iPad app by Injexa Technologies LLC.)

- Source: https://appshunter.io/ios/app/worstfirst/id6787245171 (this page in markdown: same URL + `.md`)
- Developer: [Injexa Technologies LLC](https://appshunter.io/developer/6778908051)
- Category: Medical, Education
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 17+
- Requires: iOS 15.0 · 2 MB
- Languages: American English
- Released: 2026-07-16
- Data updated: 2026-10-13
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/worstfirst/id6787245171/reviews.md

## What is WorstFirst?

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.

## Key features

- Decision-tree training
- Rule out killers first instinct
- 29 chief-complaint decision trees
- Branch-by-branch reasoning
- Teaching pearls and pitfalls
- Offline functionality

## Is WorstFirst safe?

Not enough ratings yet to assess WorstFirst.

## Is WorstFirst legit?

WorstFirst has limited verification signals. The AppsHunter Legitimacy Score for WorstFirst is 58 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/worstfirst/id6787245171/reviews.md

### 5/5 — Very helpful

*2026-07-19*

I think this app is a great tool to strengthen your decision making skills when treating common ER complaints. Not only do I think this is helpful for EM residents, but also incredibly useful for midlevel providers working in emergency medicine.

## Frequently asked questions about WorstFirst

### What is WorstFirst used for?

WorstFirst is an educational tool designed to train emergency medicine trainees in "worst-first" reasoning for undifferentiated complaints. It helps build the instinct to rule out critical conditions before considering benign explanations.

### Does WorstFirst require an internet connection?

No, WorstFirst is fully offline. It does not require an account, sign-in, or any data collection, allowing for use in any environment.

### What medical specialties are covered by WorstFirst?

WorstFirst includes 29 chief-complaint decision trees that span cardiovascular, respiratory, neurologic, abdominal, trauma, and toxicology, among other areas relevant to emergency medicine.

### Is WorstFirst suitable for clinical decision-making?

No, WorstFirst is strictly for educational use. It is not a medical device and must not be used for diagnosing, treating, or guiding patient care. All content is for learning purposes only.

### What kind of content is included in WorstFirst?

The app features structured decision trees with branch-by-branch reasoning, including teaching pearls, common pitfalls, and citations to landmark literature and current guidelines.

### What is the age rating for WorstFirst?

WorstFirst has an age rating of 17+, indicating it is intended for adult users and healthcare professionals.

### How often is WorstFirst updated?

The app was last updated on July 17, 2026, with version 1.0. Future updates will likely focus on expanding content and refining existing decision trees.

### Does WorstFirst have advertisements?

No, WorstFirst does not contain advertisements. It is a completely ad-free application.

## Version history (last 2 releases)

### 1.1 — 2026-10-02

New: 10 pediatric pathways (fever, abdominal pain, testicular pain, vomiting, headache, limp, respiratory distress, rash, altered mental status, syncope). Improved adult pathways and references.

### 1.0 — 2026-07-17

No release notes.

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## More apps by Injexa Technologies LLC

- [PreOptimize](https://appshunter.io/ios/app/preoptimize/id6778908049)

All apps by Injexa Technologies LLC: https://appshunter.io/developer/6778908051

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-13.*