Questions regarding spreadsheet and-or database functionality

I may be building a Wagn site for a client who has some moderate number handling requirements. He needs to have Excel-like tables on certain pages that allow site users to enter data, and instantly see calculated results. I know there are commercial platforms like Caspio and Knack that claim to allow for easy embedding of these kinds of apps. I'm wondering 1. if there is anything native to Wagn that might allow for this type of functionality, 2. if no to (1), how feasible it is to use some type of Ruby gem to do this on the mid-level Cloudstore tier (i.e., access Excel tables with in/out), and 3. if anyone knows of any other commercial solutions that I might want to consider.

Thanks for the time!

-Jordan W.