Are you using an Apple mobile device (iPad, iPhone, iPod...)?
If so, we now have a prototype footprint calculator mobile version that should work on your device (latest version posted October 1, 2013)!
Please note that this prototype does not have many of the features of our Flash version. Most importantly, you cannot save your data in the mobile prototype.
If you would like to give the prototype mobile version a try, please go to THIS LINK.
Comments or suggestions? Please email seastar (at) stanford.edu with any feedback on the mobile version.