The idea is very nice, but I don't like the fact that it is just an API for calculations. That kind of defeats the purpose of a spreadsheet format. At first I

The idea is very nice, but I don't like the fact that it is just an API for calculations. That kind of defeats the purpose of a spreadsheet format. At first I thought it was an actual spreadsheet application, or an Excel plugin or whatever. I tried multiple times to create a spreadsheet app that would speak to JSON APIs easily from within cells. The problem is that writing a spreadsheet app from scratch is not easy (one of my tries: http://sheets.alhur.es/ http://sheets.alhur.es/), but when that is done it is not hard to integrate it directly with PouchDB, CouchDB -- or any other database or application, actually, with a custom integration.