I have been looking at a lot of blog posts talking about Yoast SEO. After reading PatsyC's blog about fixing your sites to prevent trackbacks and pingbacks which will destroy your SEO rankings to boost theirs, I fixed my sites. Then, after a lot of curiosity, I installed the Yoast SEO plugin. I thought, why not. Other people like it, so it can't be that bad.
I really love Yoast SEO. It gives you a green light if your readability is good, and a green light if your SEO settings and what you have in your blog complies with your SEO settings. If it is just okay, you get orange lights, and if it is bad you get red lights.
I did not go premium yet, because it is $89 for each site. I probably will later on because I love it so much. Not only does it give you those lights, but it tells you what you have wrong, and will highlight the sentences out of compliance.
One drawback is you can only put one keyword on each page/post unless you go Premium. That is okay for me - I do not want to load my sites down with keywords just yet.