this website contains some free online tools
https://toolsyep.com/
https://toolsyep.com/keyword-density-checker/ tool
https://toolsyep.com/open-graph-preview/ tool
and several other tools.
I'm still developing it.
any comments or feedback is welcome.
I also hope it is a useful tool
I checked your website and the various tools functions and it works like a charm. The tools available works better than many paid websites. Great work. I specifically liked the keyword density tool.
So yes, it is a very useful site. I am bookmarked it for my own use. Promote it well.
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