Readability Score - Free Online AI Detection Tool

Measures text readability using three classic formulas—Flesch Reading Ease, Flesch-Kincaid Grade Level, and Gunning Fog—plus sentence-level stats and long-sentence flags. Scores update live as you type. Flags sentences over 30 words and estimates passive voice usage. Configure an AI provider to rewrite difficult sentences. All calculations run locally in your browser.

How to Use

  1. Paste or type your text into the input box. Scores and statistics update live as you type or paste.
  2. Review the three score tiles: Flesch Reading Ease (higher is easier), Flesch-Kincaid Grade (U.S. school level), and Gunning Fog (years of education needed).
  3. Check the Sentences over 30 words panel below to find sentences that may tire readers. Consider splitting them.
  4. Optionally open the AI Settings panel (⚙️) to configure a provider and get AI-assisted rewriting suggestions for long sentences.

Key Features

Frequently Asked Questions

What do the three readability scores mean?

Flesch Reading Ease rates text from 0–100, where higher means easier. Flesch-Kincaid Grade shows the U.S. school grade level needed. Gunning Fog estimates years of education required, emphasizing words with three or more syllables.

Is my text sent to any server?

No. All three readability formulas run entirely in your browser using local JavaScript. No text data leaves your device unless you explicitly configure an AI provider for rewriting suggestions.

What readability score should I aim for?

For general audiences and marketing copy, aim for a Flesch Reading Ease of 60 or above and a Flesch-Kincaid Grade between 7 and 9. Academic or legal texts will naturally score lower.

Can AI help rewrite difficult sentences?

Yes. Open the AI Settings panel (⚙️), select a provider, enter your API key, and the tool can use AI to suggest rewrites for sentences flagged as over 30 words.

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