“Unlock the Secrets: 8 Game-Changing Strategies That Will Transform Your Blog’s Readability Overnight!”
Yoast is probably the most popular, but Rank Math has a content readability score as well.
You can also use a third-party tool like Hemingway App.
Just paste your article into the tool, and it’ll highlight specific pieces of text you should optimize in order to improve the text’s score.

Final thoughts
Readability matters. If your readers cannot consume your content for whatever reason, then they won’t be subscribing to your email list, buying your products, or clicking on your affiliate links.
And while readability is unlikely to be a direct ranking factor for Google, it will affect your rankings indirectly.