This is absolutely useless. It claims it rewrites English sentences, but it just offers words alternatives, which is only nouns. Also, most of those suggested alternatives are unable to use. If you see their maker's home page, Whitehat Box, you can see numerous people request the refund. It's far from western progressive software like Grammarly or sketch engine. They stole my money with the diceiptive advertisement.
Looking at both spinner’s spun articles, they both seem to generate spun content that looks pretty good. Both have some grammar issues I would correct if I was posting it on a high tier 1 site, but overall SpinnerChief produced better content. Not sure if WordAi is being overly aggressive on the spins at the cost of quality. This test is very hard to call. If you go by raw numbers, SpinnerChief won. I want to leave this up to you to decide which one won. Winner none – draw!
It's a long, long job to research your keywords, keyword phrases, LSi's etc and then to write content for your chosen search term that has the perfect keywords, and the perfect density of those keywords. This plugin looks at the top 10 Google SERPS for your search term, compares them to each other, and then tells you the keywords that ALL the top 10 pages are using in their content, PLUS the density of those keywords. In less than a minute you will know EXACTLY which keywords and their relevant density to include in your website copy so that it matches Google's exact keyword expectations. Click here for more details.
Open Graph description is not detected on the main page of Spinner Chief. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML tag will help to represent this web page correctly in social networks:

Using Spinbot you can instantly spin (or rewrite) a chunk of textual content up to 10,000 characters in length (or about 1000 words), which is much longer than an average website or freely-distributed article. With a single click you can turn your old blog post or website article into a completely new one, thereby doubling the payoff you get in return for the time and energy you have already invested into creating quality website content. Spinbot is lightning fast as well as free, so there is potentially no limit to the amount of free web content that you can create using this tool. 

"It is my pleasure to give testimonial about this spinner tool. I think this is great and highly recommended tool to build a many unique articles for our internet marketing world. At the first time, I already see about another great spinner tools, but it is not free. And fortunately for me, I found spinnerchief. The free tools which have almost the same quality with another cost spinner tools. I already use spinnerchief to build many articles to attract traffics for my below minisite"
It is a simple process where the user will simply copy and paste their article into the text box. The spinner will do the rest as it produces an entirely new article on the spot. Users are also able to include words that should be ignored by the spinner. This is in case you have specific keywords that should not be taken out. This is a fantastic tool for those who are on the go and need quality content right away. Instead of spending hours on producing content and/or spending money outsourcing to writers, it is easier to employ this spinner instead.
When it comes to rewriting articles, there are times where doing it can be a lot stressful than ever, and this is very inconvenient as it can make your work slow and so is your productivity and payday. This is not a good thing for online writers and SEO specialists because this will be all of a hassle for their workday, and can give them a lot of stress.
I think it is better to just come up with your own content. Most of those type of programs that are designed to make things easier, really just make things more difficult. You are right. The more you write, the more practice you get, and the better you’ll become. I have been writing for years myself, and I have never needed any content generation programs.

In a situation where you do not have enough time or do not know how to paraphrase your text, our program will help you. The application has an innovative algorithm that will easily transform the text into a completely new one. In writing, each of us sometimes has a problem with good text editing. Have you ever wondered if there is any way to speed up? Our program is free, which will save you money and time. Solution is simple: our paraphrasing tool has an innovative algorithm and a very large database of synonyms. The machine intelligently choose an appropriate synonym or phrase for your text. With this technological solution, your text will be unique and free of plagiarism. It wasn't simple problem to solve, but after many hours of work, you can be sure that your text that has been paraphrased by us into a new version! If you want to change your new article or essay, then there is no problem. Paraphrasing or article rewriting can be tricky, even with the help of an article rewriter. Yes, you heard that right. It’s not always as easy as it may sound while using an instant article spinner you need to be sure that the original wording or style has not been copied. Even if you are citing something, it can still be considered as plagiarism if you don’t do it right. It is important to reread the results of paraphrasing tool just to see if it is making complete sense to you. Also, you may modify the words, phrases or sentences to make them sound more like you, the vocabulary and wording that the audience would recognize and find appealing. Use of plagiarism checker is also advised, just to be on the safe side. After all, computers remain computers; they can never replace human brain. To help and guide you on how to use our best free article spinner online tool, our experts have come up with a list of handy tips. These tips are constructive in preparing you to use article rewriter tool properly. You can modify words, synonyms and whole sentences so that the new sentences will sound even more like you. We remind you: the more words you change the better. This actions will show you a great paraphrasing opportunities. And your text will not be considered plagiarism. Rephrasing is not easy, however our free online app will help you to maintain the main idea of your text, all using appropriately selected words. Our program is the simplest yet most efficient online paraphrasing tool. You will know what we are talking about once you will start using this free article spinner. You have to use the our article rewriter to know what exactly we are talking about. This handy text spinner is useful for writers, bloggers, and webmasters. Accuracy, reliability, and swiftness are what makes it the best article rewriter. Moreover, it is completely free, and we intend to always keep it like that.
Cross Platform – Being a Mac user I prefer when I can fire up a program locally. WordAi is web based and therefore works on Windows & Macs without issue (Linux as well). SpinnerChief III Ultimate has a Web Api that allows spinning from the web, but we did not have much luck with it, so at this time we consider SpinnerChief a Windows only application and therefore requires me to run it in a virtual Windows Machine using VMWare Fusion. This one is a hard one to call because clearly WordAi wins cross platform, but it doesn’t have all the extras that SpinnerChief offers.
Aaron has just closed out a very profitable 5-figure promo for one of my products, and I've had the pleasure of also promoting him. Now what I'll say about Aaron is, he puts 110% in absolutely everything that he does. If you have an opportunity to jump on one of his launches or promote one of his products or just work with him, I highly recommend that you do so.
The content above is 98% unique according to Spin Rewriter and I really like it. It actually seems better than the WordAI spin – only the “Standard” one however, it is no match for the “Turing”. One thing that the spinner failed to recognize is the “green eyes” phrase where it replaced it with “environment-friendly”. Yea, I laughed too. Anyway, here is the spintax for those interested in more testing:
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