Readability Score
Free online readability score. Flesch-Kincaid, Gunning Fog, SMOG scores. No sign-up, works in your browser.
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<iframe src="https://www.theutilbox.org/embed/readability-score" width="600" height="500" frameborder="0" style="border: none; max-width: 100%;" title="Free readability score tool from The Util Box"></iframe>