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Readability Checker

Paste your draft to get its Flesch Reading Ease score, Flesch-Kincaid grade level, and the sentence and syllable averages behind them. Most web content should land between a 6th and 12th grade reading level.

Free, no signup, and everything runs in your browser.

Written for people, checked automatically.

InkSTR targets a 6th to 12th grade reading level on every article and blocks the clinical vocabulary that pushes content out of that band, without flattening it into something that reads like a manual.

Common questions

About the Readability Checker.

For most web content, 60 to 70 is the sweet spot, which corresponds to plain English at roughly an 8th to 9th grade level. Technical or legal writing naturally scores lower and that is not automatically a problem, but marketing content scoring under 40 is usually harder to read than it needs to be.

Not as a direct ranking factor. It affects the behaviour that does matter: whether people stay on the page, keep reading, and act. It also affects whether AI answer engines can cleanly extract and quote your content.

It uses the standard vowel-group approximation rather than a dictionary, so individual words can be off by one. Across a full passage the errors average out, which is why Flesch scores are only meaningful over a paragraph or more.

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