Is there any free tools for competitor keyword research? What keywords they rank for and the traffic it brings to them?

@zhain did you look an PromoterKit from the Project menu above?  https://promoterkit.com/

I tried my best to develop a free tool, and it is here: https://promoterkit.com/tools/seo/website-keywords-checker

Thanks.

1.  But I cannot find competitors for my site. It says not enough content. So if i find web pages has same content relatoed to mine is ok for competotors. 

2. I use your tool which is great. So if i use those keyword direcly to my blog seo, is that ok?

@dassa If you want to find competitors you can just go on google and enter the keyword you're targeting, you'll find a lot of competitors. And you can use Hasan's keyword research tool to find keywords with low competition and high search volume to start with.