SpinnerChief API is the function that allows other developers to use SpinnerChief functions in their softwares and users can use SpinnerChief functions in other softwares directly. As users, you need to register a SC web account to use the api in other software. As developers, you need to register at http://developer.spinnerchief.com to get an apikey to use in your software. The developers who have already integrated the SpinnerChief API are.
And then there is the amount of time that it takes to create content with this software. I have had past experience with text spinners and although it might seem like a fast way to write content, it often isn’t! By the time you have chosen a piece of content (or multiple pieces of content to blend together), put it in the software and produced content with this software, you could instead have created content that Google loves.