readability score - SERP Analysis

https://readable.com/

https://hemingwayapp.com/readability-checker

https://en.wikipedia.org/wiki/Flesch%25E2%2580%2593Kincaid_readability_tests

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

https://readable.com/text/

https://www.grammarly.com/readability

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

https://www.thefirstword.co.uk/readabilitytest

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

https://help.siteimprove.com/support/solutions/articles/80000448325-readability-tests