The reason I interpreted your question as a snarky one is that it seemed such a pointless one otherwise-- like asking, say, whether a boat can be called a boat at a stage so early in its construction that it wouldn't float.

But it sounds from your reply like you really did mean it seriously. Perhaps you believed that the guys who wrote Grid never intended to develop it further, and you were puzzled that they were calling it a spreadsheet. If so I apologize.

I think though that many of the people who upvoted you did realize that this post was an instance of a startup launching an early version one that they plan to develop further, and your innocent question thus became snarky in their hands.