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Readability score checker

Score text readability with Flesch, Fog, ARI and Coleman–Liau.

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Readability score checker
Paste an article, landing page, essay or help-centre draft and get five readability scores at once: Flesch reading ease with a plain-language verdict, Flesch–Kincaid grade level, Gunning fog, the Automated Readability Index (ARI) and Coleman–Liau. Under the indices the report lists the raw numbers they are built from — words, sentences, syllables and letters, plus average sentence and word length — so you can see exactly why a text scores the way it does.
Flesch reading ease runs from 0 to 100 and higher means easier: 60–70 is the standard band for web copy aimed at a general audience, 90 and above reads like a children's book, below 30 is dense academic prose. The grade-level indices estimate the years of schooling a reader needs; most successful online content sits between grades 7 and 9. Writers use these scores to keep SEO content readable, meet plain-language requirements, match teaching materials to a class level, and keep UX microcopy short and clear.
The report updates live as you edit, so shortening a sentence or replacing a heavy word shows its effect immediately. Syllables are counted with a vowel-group heuristic that handles accented characters, and text without sentence-ending punctuation is treated as a single sentence.
One honest note: Flesch, Flesch–Kincaid and Gunning fog were calibrated on English text. For other languages treat them as orientation; the character-based ARI and Coleman–Liau transfer better between languages. Everything runs locally in your browser — nothing you paste is uploaded anywhere.
FAQ
What is a good Flesch reading ease score?
For web copy aimed at a general audience, 60–70 is the usual target. 90 and above reads like a children’s book, 30 and below is dense academic prose. Grade-level indices around 7–9 suit most online content.
Do the scores work for languages other than English?
Flesch, Flesch–Kincaid and Gunning fog were calibrated on English text, so for other languages treat them as orientation rather than exact grades. ARI and Coleman–Liau count characters instead of syllables and compare better across languages.
How are syllables counted?
With a heuristic: each maximal group of vowels counts as one syllable, every word has at least one, and an English silent "-e" at the end is subtracted ("make" is one syllable, "table" keeps two). It is approximate but consistent — exactly what the formulas need.
What happens when my text has no sentence punctuation?
The whole text counts as a single sentence, which makes it look like one very long sentence and pushes the indices toward difficult. Add full stops, question marks or exclamation marks for realistic numbers.
Is my text uploaded anywhere?
No. The analysis runs entirely in your browser and your text never leaves your device.