# HALO: EM — High-acuity, low-occurrence

> High-acuity, low-occurrence (iPhone/iPad app by Arjan Dhoot.)

- Source: https://appshunter.io/ios/app/halo-em/id6790187823 (this page in markdown: same URL + `.md`)
- Developer: [Arjan Dhoot](https://appshunter.io/developer/6785462587)
- Category: Medical, Education
- Price: Free
- Age rating: 17+
- Requires: iOS 15.0 · 3 MB
- Languages: American English
- Released: 2026-07-20
- Data updated: 2026-08-05
- User reviews in markdown: https://appshunter.io/ios/app/halo-em/id6790187823/reviews.md

## What is HALO?

HALO is a bedside reference for High-Acuity Low-Occurrence emergencies — the procedures you rarely perform, and cannot afford to get wrong when you do.

It is built for one moment: you are at the bedside, the patient is deteriorating, and you have less than a minute to remember the steps.

WHAT'S INSIDE
• 70 procedure and management cards, from cricothyroidotomy and resuscitative hysterotomy to paracentesis, lumbar puncture and lateral canthotomy
• 25 core ED procedures — simple and complex lacerations, nerve blocks, arthrocentesis, abscess drainage, joint reductions, procedural sedation and more
• A casting and immobilisation reference — find the injury, see the immobilisation most commonly used for it plus a reasonable alternative, then the technique and a video showing how to apply it
• Decision algorithms you can walk step by step
• "Still failing — what am I missing?" sections for when the protocol has run out and the patient is still crashing

BUILT FOR THE BEDSIDE
• Red ring = act in seconds. Amber ring = act in minutes.
• Steps, not paragraphs. Doses where you need them.
• Works completely offline — no signal required, which is exactly when you need it
• Free. No accounts, no ads, no subscription, nothing to unlock.

WHO IT'S FOR
Physicians, residents and other qualified clinicians.

HALO is a reference and educational tool. It does not diagnose, does not make recommendations for an individual patient, and does not replace clinical judgement, local protocols or specialist consultation. Clinical responsibility remains with the treating clinician.


## Version history (last 1 release)

### 1.0 — 2026-07-20

No release notes.

## More apps by Arjan Dhoot

- [Preceptor: CCFP Exam Prep](https://appshunter.io/ios/app/preceptor-ccfp-exam-prep/id6785462585)
- [Preceptor: MCCQE](https://appshunter.io/ios/app/preceptor-mccqe/id6788785495)

All apps by Arjan Dhoot: https://appshunter.io/developer/6785462587

---

*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 2026-08-05.*