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Free readability checker.

Get Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG and more for any text, live as you type. Free, runs in your browser, no sign-up. From the team behind Sidenote, the AI reading assistant that cites every answer to the source.

Runs entirely in your browser - your text never leaves your device.

FAQ

Free readability checker - common questions.

Yes: it's free with no sign-up, and it runs entirely in your browser. Your text is never sent to a server.
Flesch Reading Ease plus five US grade-level scores - Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau and the Automated Readability Index - and an average grade.
For a general audience, aim for a Flesch Reading Ease of 60–70 (plain English, around 8th–9th grade). Higher is easier; specialist writing naturally scores lower.
They're estimates derived from word, sentence and syllable patterns (syllables are approximated heuristically), so use them as a directional guide rather than an absolute.
This scores how hard your text is to read. Sidenote - the extension and web app - reads dense documents for you: summarize them or get any passage explained in plain English, with every answer cited to the source.
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