reading level checker - SERP Analysis

https://hemingwayapp.com/readability-checker

https://www.wordcalc.com/readability/

https://www.arbookfind.com/

https://readabilityformulas.com/readability-scoring-system.php

https://support.microsoft.com/en-us/office/get-your-document-s-readability-and-level-statistics-85b4969e-e80a-4777-8dd3-f7fc3c8b3fd2

https://readable.com/

https://www.webfx.com/tools/read-able/

https://macmillanenglish.com/level-test/

https://answers.library.american.edu/faq/174550

https://datayze.com/readability-analyzer