what is tools of duplicate content

You can be fooled by tools like smallseotools or even some of the best tools like copyscape. I would suggest to pick any line from the content and check manually on google. With this, you can check if the content is spun from somewhere, which most of the duplicate content checkers fails to analyze.
 
Most popular tool is Copyscan. You can also try:
1. Duplichecker
2. SmallSeo Tools
3. Dustball etc.
 
I use Grammarly Premium to check duplicate content but you can also use small SEO tools, Copyscape for free of charge.
 
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