ST. LOUIS — Responsive Respiratory has launched a free oxygen app for mobile devices (Android and iPhone). The O2 To Go! Cylinder Duration Calculator is a handy tool for technicians, therapists and even patients to use, according to the company, and addresses the common patient question: "How long will my cylinder last?"

The mobile app automatically calculates the estimated oxygen available based on user input of device, liter flow setting, cylinder size and contents and displays the estimated cylinder duration in hours and minutes at designated liter flow settings.

"The user-friendly interface allows smart phone users to easily figure the estimated cylinder duration with a multitude of device, cylinder and flow range combinations. It's an unbelievably versatile yet simple to use tool," Responsive Respiratory President Tom Bannon said in a release.