X-Spinner is a spinner on it's own and has nothing to do with WordAI or TBS. The difference with X-Spinner and most if not all currently available spinners is that it creates your own API so you can use it however you wish. WordAI for example is completely online solution and provides API to use with different software and therefore it is charged monthly. If you run out of credits there, which can happen easily since their Turing Spinner API usage has quite a low limit, you are charged additionally. TBS also provides an online API(which is hosted on their servers and it is charged extra) to be used with any other software which supports it's API. TBS also offers a desktop version of their software to be used, but that only downloads their treasurers and to be able to spin you have to do it in that desktop software. Again, if you want to do it in any other software, you have to use their API which is charged extra. And all spinners who provide online API(and I believe all of them do) charge something extra for that API usage, or they limit the number of API calls, which is understandable since you're using their servers to spin content.
The difference with X-Spinner is that you are getting an API which is downloaded and hosted on your own desktop PC! This means no extra charges for using the API in any other software like (SEO Content Machine, Kontent Machine etc..) You can fire up and use X-Spinner API's however you wish and spin as long as your desktop CPU can handle!

And all of that with the quality of ..well I could say equal to WordAI if you use the Elite option, but that is debatable. It certainly is pretty much close though, much better than any other spinner I've seen for sure, so if WordAI is #1, X-Spinner is definitely a #2 that's for sure. It really does generate great spins that make me very happy and it does that EXTREMELY FAST since everything resides on your own PC, unlike WordAI's turing which can be quite slow for spinning larger quantities of content.
And the other great thing about X-Spinner is that it can simulate any other API: TBS, WordAI, SpinRewriter etc.. This means that if you have a software which can only handle TBS API for example and you own only X-Spinner, you can make X-Spinner simulate the TBS API and use it in that software which only supports TBS. So that way you won't have to buy TBS and pay for additional API calls, AND you get much better quality spins!
I hope I made it clear to some folks what this does and how an interesting approach is to spinners. For a fixed life-time fee it's definitely worth owning it, such a great tool to have in the arsenal. Cheers!