I could not find a related Stack Exchange site to bring up the following question. Please let me know the related SE site.
What is the best paraphrasing application.
I can't guarantee an answer but - if you mean software - and you need to include a platform and what you need and so on, software recommendations would be the site. This goes into detail and here's a shorter version of their recommended information you need to include when asking a question. .
Great paraphrasing does involve some personal style, and understanding so I doubt its doable in software, but if there's any site to ask, it would be software recommendations.