All listed websites are behind a pay wall. Secondly, they all run affilliate programs for youtubers to promote them, every click earns money. Thirdly, most of them suck and provide fake references, references that dont match the research question or references that are also behind pay walls.
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Is it ok using plagiarism detector tools or app by your self because I heard that if you once check plagiarism by yourself it saves the content and then next time it consider your own work as plagiarized...?
They offer multiple features that are available for the free version too. But with paid subscription you can unlock more features. Check out the detailed video - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-z6V53lKjiiI.html