Utility for determining three different lethal concentration and time (LCt50) calculations when using chlorobenzalmalononitrile (CS) non-lethal chemical agent inside a structure. The formulas are based on a government study using animals and soldiers to determine the amount of agent that will likely kill 50% of the people in a closed sealed space using the amount of agent and time as a factor.

The app's easy-to-use forms require the user to enter the length, height and width of a structure, along with how much agent was used. If you want to determine the amount of the agent you can safely use in a building, the app will tell you the LCt50 after one simple numeric entry by the user. You can also determine how much agent to use for any LCt50 you want to establish.

Every team leader responsible for the delivery of chemical agents can make use of this app.

What’s New

Version 1.2

64-bit support. Price increase due to the agonizing process Apple puts developers through just to rebuild their apps with zero code change just to support newer devices/OS versions. Get it on Android for free since it doesn't cost $100/year and weeks of my life just to maintain this simple app there.
NOTE: Apple couldn't make the process of rebuilding the application "just work", and as a result, the tab buttons no longer have labels. I've spent far too many hours trying to figure out how to fix something that would never have been broken on any other company's watch in the history of software production, so it's just going to have to remain as is.

Ratings and Reviews

3.8 out of 5
5 Ratings

5 Ratings

Big Bird 66 ,

Been waiting a long time for this...

Great app!!!! Very easy to use!! Would like to see munition selection option in future update(s).

Vzeke ,

A must have

Great app and a must have for all gas guys or any tactical operator deploying with gas. Very easy and quick to use. How about a munitions data card app?

bmullins3 ,

Great ap

Would like to see also the calculation for ICT50 as well as the data sheet on the munition.


Brent Pearson
3.8 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2011 Pearson-Cole Software


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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