Data·yze Readability Analyzer
6.0#19 in readability checkersFree planFree planWeb
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It suits writers who want readability estimates for text or paragraphs, and people assessing a webpage or site. The scores are estimates rather than measures of writing quality.
ProWritingAid suits English-language writers who want grammar and style suggestions in supported writing apps. Writers working on longer documents can consider Premium or Premium Pro, which support documents of any length.