Check an article's length, readability, headings and use of a target keyword, with plain-language advice.
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Read the checks and fix the ones marked with an exclamation mark.
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A readability score from about 0 to 100. Higher means easier to read; 60 to 70 is plain English.
No fixed number. Between about 0.5% and 2.5% reads naturally. Write for people first.