I think the "CRUD app" classification is never accurate. For example, your app almost certainly performs queries that have a where clause. That means that the R

I think the "CRUD app" classification is never accurate. For example, your app almost certainly performs queries that have a where clause. That means that the R step has logic, which means you can (and I know I do) get the logic wrong. Also, there's usually complicated rules during C, where a user is only permitted to actually create data in certain cases, and when data is created other data needs to be updated to remain accurate, etc. So yea, of course data is Created and Read, in that every application maintains data. But that doesn't mean that it's a CRUD app. If you have any where clauses or if expressions, it's not a CRUD app. Finally, the most popular way of storing data is the relational model. Which, is just math applied to the notion of data: https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf