Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.

PrepostSEO article re-writer is developed with advance techniques so that it can help users in an effective way. This tool scans through all the words and change them with their synonym. To use this word spinner please paste copied content in the input box and click on the rewrite button. After that our tool will process whole text and then spin it. In the Step 3 you can choose different words from the suggestions or you can use your own word. After that click on the next button to get re-written content.
QuillBot is a state-of-the-art paraphrasing tool. It is the best article rewriter available, and can completely paraphrase an entire article for free. Simply input a sentence, and hit the "Quill It" button. QuillBot will then rephrase the content while maintaining the original meaning. You can then click on any of the words or phrases to have a drop down thesaurus appear which can then provide further edits in order to optimize your sentence. It is the best article spinner out there. We will even provide statistics to how fluent the sentences are, and how much they have changed. QuillBot can also function as a grammar checker and fluency enhancer. In addition to this, it can provide you with creative suggestions on your sentences. We labeled the software as a "smart thesaurus for sentences" or a full-sentence thesaurus. QuillBot underlying technology uses complete machine learning. This means that when you interact with the website, you are providing data that will be used to improve QuillBot's proficiency. This also means that the version you are using will be the worst version of the model, and that it will constantly improve. Users have been uitilizing QuillBot for a variety of purposes. They use QuillBot as an SEO optimizer tool, in order to improve their writing, or simply get over writers block. The language that QuillBot produces is natural, and will improve overtime as well. Our mission is to achieve human-level paraphrasing. Once we achieve this task, we will aim to produce language in particular linguistic styles or degrees of sophistication. We will even allow users to control the degree of permutation that the paraphrasing tool produces. This will give users complete control over QuillBot and the ability to manipulate language to meet their needs. While our goals our ambitious, we see a clear path forward towards achieving them!
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