Readability Score & Keyword Density
Analyze writing difficulty and reading comprehension scores. Get Flesch Reading Ease, Flesch-Kincaid Grade Level, Coleman-Liau index, and keyword density metrics.
Difficult (College Student)
Estimated U.S. School Education Level
Based on character counts per 100 words
Top Keyword Frequency & Density
Step-by-Step Instructions
Paste Your Document or Manuscript
Enter your draft article, essay, press release, technical manual, or student paper into the text editor.
Compute Multi-Index Readability Scores
The tool immediately calculates Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau Index, SMOG Index, and Automated Readability Index (ARI).
Analyze Syllable & Sentence Complexity
Review detailed linguistic diagnostics including average syllables per word, average sentence length, and percentage of complex polysyllabic words.
Optimize Text for Your Target Audience
Use the actionable feedback to simplify vocabulary and shorten dense sentences to achieve optimal reading comprehension levels.
Key Features & Capabilities
- Comprehensive 6-formula readability suite: Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau, SMOG, and ARI
- Advanced syllable estimation algorithm accurately counting phonetic vowel groupings and diphthongs
- Visual readability grade breakdown mapping scores to US school grade levels and adult reading audiences
- Sentence length and polysyllabic word density heatmap highlighting difficult sentences for revision
- Real-time dynamic analysis as you edit text in the browser editor
- Confidential text security: 100% client-side computation with no server logging
Frequently Asked Questions
What is Flesch Reading Ease and how is the score interpreted?
Flesch Reading Ease measures text comprehension difficulty on a scale from 0 to 100 using the formula: `206.835 - (1.015 * ASL) - (84.6 * ASW)`, where ASL is Average Sentence Length and ASW is Average Syllables per Word. A score of 60–70 represents plain English (accessible to 8th–9th graders), 90–100 is very easy (5th grade), and 0–30 indicates college-graduate level technical text.
What is the difference between Flesch-Kincaid Grade Level and Gunning Fog Index?
Flesch-Kincaid calculates the US school grade required to understand the text (e.g. 8.0 = 8th grade). The Gunning Fog Index places particular emphasis on 'hard words' (words with three or more syllables), making it the preferred standard for corporate communication, journalism, and technical documentation.
How does the Coleman-Liau Index calculate readability without counting syllables?
Unlike Flesch or Fog, the Coleman-Liau Index relies on character counts per word rather than syllable estimation (`0.0588 * L - 0.296 * S - 15.8`, where L is average letters per 100 words and S is average sentences per 100 words), making it computationally resilient to irregular English pronunciation.
What is the ideal readability score for web content and SEO copywriting?
For general web audiences, search engines, and commercial blogs, targeting a Flesch Reading Ease score between 60 and 70 (or a Flesch-Kincaid Grade Level of 7th to 8th grade) ensures maximum engagement, lower bounce rates, and high accessibility.
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