I developed a Gas Blending app, with real gases ( Van der Waals equation state ), for gas filling calculations with Nitrox, Trimix, HeliAir.
It manages fills in Partial pressure, continuous flow ( stick Nitrox and Trimix ), calculates bank tanks min. required pressure, filling costs, and O2 captors values to set-up continuous trimix fill.
Android version is available on Play Store:http://play.google.com/store/search?q=pastoblend&hl=en
and iPhone / iPad:
soon on App store.