I have truncated my Excel spreadsheets that are the full Course Application, so they contain only the pertinent parts for course measurement, and have downloaded them onto my Android smart-phone.
This allows me to enter my calibration info, go to the Start line, and enter my Jones counts. This then gives me all my split info, without more math at the Start line.
I have it posted on my Website if anyone else wants to use it on their phone. I also have a link to an app that lets you enter information into the spreadsheet ($15), as the free "reader" version only allows you to read the Office docs.
I just connected my phone via USB, and put the spreadsheet (xlsx) into my Documents folder on the phone. The app points to the folder, and launches the spreadsheet. It seems to work great for me.