Text Readability Analyzer

How It Works

Paste or type any text into the input. The tool tokenizes the text into sentences, words, and syllables, then computes six widely-used readability scores: Flesch Reading Ease (higher means easier, Rudolf Flesch 1948), Flesch-Kincaid Grade Level (U.S. school grade, developed for the U.S. Navy in 1975), Gunning Fog Index (weights complex words), SMOG Index (Simple Measure of Gobbledygook, McLaughlin 1969), Coleman-Liau Index (character-based, no syllable counting), and Automated Readability Index (character-based like Coleman-Liau, developed for the U.S. Air Force in 1967). Supporting statistics are shown alongside: word count, sentence count, average sentence length, average syllables per word, count of polysyllabic words (3+ syllables), and estimated reading time. The syllable counter uses a pronunciation-rule heuristic that handles common silent-e and vowel-cluster patterns. Everything runs instantly in your browser as you type.

Use Cases

• Checking that a blog post, landing page, or email hits the target reading grade for its audience
• Simplifying technical documentation by iterating on wording until Flesch-Kincaid drops by a grade or two
• Meeting plain-language requirements for government, healthcare, or legal communications
• Comparing draft versions of a school essay against required grade levels
• Teaching writing students how different readability formulas emphasize different aspects of complexity