Flatsheet vs Sheetsu: What are the differences?
Developers describe Flatsheet as "Manage your content with custom fields with a friendly editor & a simple JSON API". Flatsheet is a tool for managing tabular data with a friendly editor and a simple JSON API. The editor allows the creation of rows and columns of data, similar to a spreadsheet. The JSON API exposes that data so it can be easily utilized by websites and applications. On the other hand, Sheetsu is detailed as "Turn a Google Spreadsheet into an API". Use spreadsheet as your database. Give data to your users the nice way, directly from the tool you know. Without bothering webdeveloper.
Flatsheet and Sheetsu can be categorized as "Spreadsheets as a Backend" tools.