InspectionLogic offers a free app called F(ppm) to calculate the flow rate and emissions of a volatile organic compound leak over any period of time. For example, if you have a Leak Detection And Repair (LDAR) program at your chemical plant or oil refinery, you could do Delay Of Repair (DOR) calculations on a leaking connection using your smart phone.   Compatible Devices:  iPhone, iPad, Android phone, Android tablet, Windows phone, Blackberry, Apple Mac, Windows PC.   Download the app for free from the Apple App Store or Google Play.