Chem Companion
Emergency Response Toolkit
Free · Designed for iPad. Not verified for macOS.
iPad
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 .
- This app’s overall rating was recently reset.
Critical performance fixes for chemical comparer, SCBA tool, and user feedback. Additional software improvements, organizational licensing, and data synchronization with chemicalcompanion.org.
The developer, MEPSS 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- MEPSS LLC
- Size
- 108.3 MB
- Category
- Reference
- Compatibility
Requires iPadOS 15.0 or later.
- iPad
Requires iPadOS 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.
- iPad
- Age Rating
18+
- 18+
- Infrequent
Medical Treatment information
- Copyright
- © 2026 MEPSS LLC