Readability Engine

A Readability Engine analyzes text to determine how easy or difficult it is to read. It measures reading grade level (what education level is needed to understand the text), sentence and word complexity, syllable counts, and overall clarity. Our tool uses academic formulas like Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, SMOG, and more—all calculated locally without any API.

Our tool calculates 7 industry-standard readability metrics: Flesch Reading Ease (0-100 scale), Flesch-Kincaid Grade Level, Gunning Fog Index, SMOG Index, Coleman-Liau Index, Automated Readability Index (ARI), and Dale-Chall Readability Score. Each formula uses different factors like syllables, sentence length, or character counts to give you a complete picture of your text's complexity.

We use a rule-based syllable counting algorithm that detects vowel groups, handles silent 'e' endings, and includes an exception dictionary for common irregular words. This approach is 95%+ accurate for English text and runs entirely in your browser—no server processing needed.

For general audiences, aim for 60-70 (Standard reading level). Scores of 70-80 are "Fairly Easy" (7th grade), and 80-90 are "Easy" (6th grade). Newspapers typically target 60-70. Marketing copy and web content often aim for 60+. Academic and technical writing may range from 30-50, which is acceptable for specialized audiences.

The Grade Level (Flesch-Kincaid) indicates the U.S. school grade needed to understand your text. A score of 8 means an 8th grader (age 13-14) can read it comfortably. For broad accessibility, aim for grade 6-8. Healthcare and government communications often target grade 5-6 to ensure maximum reach.

Live Mode automatically analyzes your text as you type or paste, updating results in real-time with a small delay for performance. Manual Mode (default) waits until you click the "Analyze" button, which is better for longer documents where you want to finish editing before checking readability.

100% Private. All analysis happens locally in your browser using JavaScript. Your text is never uploaded to any server. This makes the tool safe for analyzing confidential documents, academic papers, business content, or any sensitive material.

This tool is valuable for: Students checking essay complexity, Teachers ensuring materials match student levels, Content Writers & Bloggers optimizing for engagement, SEO Specialists improving dwell time, Technical Writers balancing clarity with accuracy, and Healthcare/Legal professionals making documents accessible to the public.