# Chem Companion

> Emergency Response Toolkit

Canonical page: [https://chrome-stats.com/d/id1442599372](https://chrome-stats.com/d/id1442599372)

## Overview

- **ID:** `id1442599372`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** MEPSS LLC
- **Category:** Reference
- **Version:** 5.0.3
- **Last updated:** 2026-04-27
- **First published:** 2018-11-21
- **Size:** 103 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/chem-companion/id1442599372)
- **Website:** [https://chemicalcompanion.org](https://chemicalcompanion.org/)
- **Privacy policy:** [https://chemicalcompanion.org/cookie-policy](https://chemicalcompanion.org/cookie-policy)

## Description

Chemical Companion (aka ERDSS) has been updated for performance and to ensure smooth operation on iPad devices. Additional data sets and bio tools coming late 2026!

The Chemical Companion provides first responders with decision support for hazardous environments contaminated with chemical agents. This software tool is provided free-of-charge to the military, law enforcement, and fire departments.

IMPORTANT: Access and usage of the application requires an approved account on chemicalcompanion.org . The account is free for first responders and military.

Features include:
- Detailed information on 3000+ common chemicals and synonyms
- Personal Protective Equipment (PPE) including respirators
- Hazardous Concentration Levels and Exposure Guidelines
- Isolation and Protective Action Distances
- ERG and Emergency Medical Information
- Identify unknown chemicals using physical properties or exposure symptoms
- Over 30 Decision Support Tools

This application is only accessible by authorized personnel. You may register for an account at https://chemicalcompanion.org .

## Rankings

- #1,530,900 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1442599372)