AI readability checker
What the AI readability checker does
This AI readability checker reads a passage and describes how hard it is to get through: sentence length, paragraph shape, roughly what grade level the writing sits at, and which specific sentences are doing most of the slowing down. Paste in anything, a blog draft, an email, an AI-generated answer, and it hands back a plain description of the reading experience rather than a single unexplained number.
It is a server tool. Text is sent to our server, read by a language model, and the description comes back to the page. 5 free checks in any rolling 24 hours, nothing stored afterward.
A readability check is not a grammar check. This tool looks at how a passage reads, not whether it is correct. Run the companion AI grammar checker if what you actually need is grammar, spelling and punctuation fixes.
The problem
Reading difficulty in AI-written text, in plain terms
AI-generated text is rarely wrong at the sentence level, so the reason it's hard to read is usually structural rather than grammatical: sentences that run long because a model tends to fold several ideas into one clause, paragraphs that stay at the same density from start to finish, or vocabulary that's more formal than the audience actually needs.
None of that shows up as an error. It shows up as fatigue by the third paragraph, which is exactly what a readability check is built to describe before a reader has to feel it.
How it works
How to check readability in three steps
No setup, no formatting required.
- Step 1
- Paste the text you want checked, up to 12,000 characters. A full passage gives a more reliable read than a single sentence.
- Step 2
- Press Check text. It goes to our server once, gets read for sentence length, structure and vocabulary, and the description returns to the page.
- Step 3
- Read the summary and the specific sentences flagged as hardest to get through, then decide what, if anything, to simplify.
Why it matters
What a readability check actually shows you
A reading-grade number on its own doesn't tell you much. What matters is which sentences are pulling that number up, and why: a 40-word sentence carrying three separate ideas, a paragraph with no short sentence anywhere to let the reader catch a breath, a term that's precise but unfamiliar to the actual audience.
That is the difference between a readability check and a word-count tool. A word count tells you the text is long. A readability check tells you where it gets hard, sentence by sentence, so the edit is specific rather than a vague instruction to write more simply.
How it's measured
Why readability is described, not scored as a fact
Reading grade level is an estimate built from sentence length and word difficulty, not a physical measurement. Two well-known formulas can put the same paragraph a grade level or two apart, because they weigh syllables and sentence length slightly differently.
This checker reports a description rather than treating a single number as settled fact: roughly what level the passage reads at, and which parts are driving that reading, so you can judge the actual sentences rather than trust a score you can't see the reasoning behind.
Straight answer
Does a readability score prove a text is well written?
No. Readability measures how easy a passage is to move through, not whether it's accurate, persuasive or well argued. A simple sentence can be simply wrong, and a complex one can be exactly right for a technical reader who needs the precision.
Treat the result as a read on ease, matched against who you're actually writing for, not a verdict on quality. A legal brief and a landing page should not score the same, and that's not a flaw in either one.
Who uses it
Who uses the AI readability checker, and when
One check, several different reasons to run it.
- Content teams
- Checking that a landing page or blog post actually reads at the level the audience expects, before it ships.
- Teachers
- Checking that a handout or assignment sits at the reading level intended for the class.
- Technical writers
- Catching a paragraph that's crept into needlessly dense phrasing for what should be a plain explanation.
- Anyone editing AI output
- Seeing which generated sentences are running long before publishing, rather than guessing by eye.