I'd argue that spreadsheets are applications that allow for organization and analysis of tabular data (http://en.wikipedia.org/wiki/Spreadsheet).

This clearly has some limited organizational functionality, but no analysis (that I can tell, at least.)

I think the argument about what is or is not a spreadsheet is pretty much semantics and nothing else, but I think it might be a bad move for Grid to call itself a spreadsheet app (note: I do not know if Grid calls itself a spreadsheet app) since the vast majority of consumers are going to equate that with Excel or Numbers.