Vale-compatible implementations of many popular readability metrics.
Add it to your .vale.ini, then run vale sync.
Packages = Readability [*.md] BasedOnStyles = Vale, Readability
Try to keep the Automated Readability Index (%s) below 8.
Try to keep the Coleman–Liau Index grade (%s) below 9.
Try to keep the Flesch–Kincaid grade level (%s) below 8.
Try to keep the Flesch reading ease score (%s) above 70.
Try to keep the Gunning-Fog index (%s) below 10.
Try to keep the LIX score (%s) below 35.
Try to keep the SMOG grade (%s) below 10.