Yesod is a web framework. It is designed to display web pages with some sort of datastore backing them. If you had a CRUD-type app with a few different data m

Yesod is a web framework. It is designed to display web pages with some sort of datastore backing them. If you had a CRUD-type app with a few different data models then Yesod will make it really easy to generate the appropriate HTML and forms and make them type safe. It extends the Haskell all the way down to the application layer, assuming standard HTML as your primary response and a certain data representation and persistence layer. Snap (I have only looked at it. Please correct me) seems like it only goes as far as the HTTP layer. It's designed so you can implement web services. Those services might return HTML, but they might return JSON or XML. It doesn't care or help you with your data representation. You have to do your own data persistence and display layers.