Google Webmaster Tool, Google Analytic, Google Adwords, Majestic SEO, Ahref etc are the best tools in SEO for monitoring your website.
smallseotools is the great website that help in seo.
You can check duplicate content, keyword position in search engine like google, page rank, alexa rank and so on. this is really a very helpful website. must visit and share to other so that other people could also use it.
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