Flesh is a Java application designed to analyze a document (plain text, rich text, Word documents, and PDFs) and display the difficulty associated with comprehending using the Flesch-Kincaid Grade Level and the Flesch Reading Ease Score.
License
GNU General Public License version 2.0 (GPLv2)Follow Flesh
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User Reviews
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I ran a test on a Word doc, and the results differed considerably from MS Word's own Readability Analysis. This tool is only of use if it is accurate; and as a professional Technical Author I'm inclined to trust the millions invested by MS. I hoped to find something that a client could use on Linux, but I'm not sure that I can. It doesn't appear to accept .docx files. There is no support offered. Suggest you try it and see, take pot luck.
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I use extensively the command line version. It's very useful to improve text readability.