CraftyLevel is a productivity chrome extension. it's a free extension and is featured in Productivity, it has 7,000+ active users since released its first version, it earns an average rating of 3.33 from 6 rated user, last update is 1028 days ago.
***UPDATED: Highlight some text, then click the icon in the extension bar to see Flesch-Kincaid Grade Level. This extension shows you the Flesch-Kincaid Grade Level for any web page. The results tell you how many years of formal education a reader theoretically needs to understand a text. For example, a 6.3 would correspond to Grade 6 in the United States. For more information on the algorithim, see here - https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests#Flesch.E2.80.93Kincaid_grade_level
You could download the latest version crx file or older version files and install it.
English.
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Very simple and easy. As an Educator in English and Social Studies, I have often worked hard to find reading levels for digital materials. If you highlight the text, then click the icon, it shows you the grade level equivalent. I hesitated to install it because of the low review score, until I realized the low-scoring reviews were from people who ironically were struggling to read the instructions.
Does nothing!!!
The extension only does one thing, but it does it simply and unobtrusively. The Flesch-Kincaid reading level appears as a red number on the extension icon for the webpage you're browsing. Definitely useful when selecting sources for students.