AI readability checker & score

AI readability checker

What the AI readability checker does

This app checks a draft for how easy it actually is to read: sentence length, paragraph density, roughly what grade level it lands at, and which sentences are pulling that number up. It's built for the practical question a content team asks before publishing, will this actually read at the level our audience expects.

It runs as a server tool. Text you paste goes to our server to be read and described, and comes back with specifics attached. 5 free checks in any rolling 24 hours, no account required.

This is a separate check from grammar. Readability looks at how a passage moves; grammar looks at whether it's correct. Run the app's grammar checker when correctness, not ease, is the actual question.

The problem

Reading difficulty in AI drafts, in plain terms

AI output is grammatically fine most of the time, so when a draft is hard to read the reason is structural, not a mistake to fix.

Sentence length

Several ideas folded into one long clause instead of split across two shorter sentences a reader can actually track.

Flat paragraph density

No short sentence anywhere to let a reader catch a breath between dense ones.

Vocabulary mismatch

Precise, formal terms where the actual audience needed the plainer word.

Buried structure

The main point arriving at the end of a long sentence instead of at the front, where a skimming reader would catch it.

Workflow

How to check a draft's readability in three steps

Three steps, no prep work.

1. Paste the draft

Drop in the text you're checking, up to 12,000 characters. A full passage gives a steadier read than one sentence.

2. Run the check

The text goes to our server once, gets read for structure and difficulty, and the description comes back to the page.

3. Fix the flagged sentences

Start with the specific sentences named as hardest, not the whole draft at once.

Why it matters

What a readability check shows that a word count doesn't

A word count tells a team the draft is long. It says nothing about whether it's hard to get through. A readability check names the actual sentences doing the damage, a 40-word sentence stacking three ideas, a paragraph with no breathing room, so the edit is specific instead of a vague note to simplify.

That specificity is what makes it useful in a real editing pass. Nobody rewrites a whole page on a generic instruction, but a flagged sentence with a reason attached gets fixed. It also gives a team a shared, repeatable way to talk about a draft's difficulty, rather than one editor's gut feeling that this reads a bit dense against another editor's different gut feeling on the same page.

How it's measured

Why the reading level is described, not treated as fixed

A grade-level estimate comes from sentence length and word difficulty, not a measurement with one correct answer. Two standard formulas can disagree on the same paragraph by a grade or two.

This app reports a description, roughly what level, and which parts are driving it, rather than a bare score presented as settled. That's a more useful input for an editing decision than a number nobody can double-check.

Straight answer

Does a good readability score mean the draft is good?

No. It measures ease of reading, not accuracy or persuasiveness. A simple sentence can still be wrong, and a genuinely technical piece may need the complexity a lower score would penalize.

Match the target level to the actual audience, don't chase the lowest number by default. A support article and an API reference shouldn't read at the same level, and that's not a defect in either.

Who uses it

Who runs the readability checker before publishing

Same check, different points in a workflow.

Content teams

Confirming a landing page reads at the level the target audience actually expects.

Support teams

Checking that AI-assisted help articles don't drift into dense, jargon-heavy phrasing.

Marketers

Catching a paragraph that's crept formal in copy meant to read casually.

Educators

Confirming a handout matches the reading level intended for the class.