Is the spreadsheet a web based application that I can access anywhere?

The House Flipping Spreadsheet is a Microsoft Excel based spreadsheet and operates like any other document, file or spreadsheet that can be save to a personal storage, cloud service and accessed anywhere.

I personally use Google Drive, but Box.com, Dropbox.com, & SkyDrive, among others, all offer cloud storage solutions that will give you mobile access to your spreadsheet files.