The 10+ Best SEO tools of 2021:

1. GTmetrix: An authoritative website for measuring website speed, providing a lot of professional advice
   
2. Speed Insight: Google's official speed measurement tool, recommended for mobile terminals
   
3. Ubersuggest： Can search keywords for free, even easier to use than many paid tools
   
4. Seobook： Provide 1000 free keyword suggestions
   
5. Synonym： Keyword semantic mining, very easy to use
   
6. Serpstat： I often use this tool to write articles for self-question and self-answer promotion. Generally, I will not tell people who are not familiar with it.
   Moz： Mainly use this tool to check the Da and Pa values of the website
   
7. Semrush： Keyword artifact: search volume of keywords in different countries, as well as ad clicks, keyword difficulty
   
8. Ahrefs： Integrate the best and most complete data in the industry and analyze the keywords of competitors
   
9. Neil Patel： Your source for all things marketing.
   

10. Looooi：A full-featured, powerful Analytics Data solution

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