Content Readability Checker

Paste your draft and get five readability scores, a target-keyword density check, and a list of the exact sentences making your content harder to read — all calculated instantly in your browser.

Your content *

0 words · 0 sentences

Target keyword or phrase (optional)

📊 Flesch Reading Ease

0-100 scale, higher = easier. 60-70 reads like plain English (8th-9th grade); most web content should aim for 60+.

🎓 Flesch-Kincaid Grade

The US school grade level needed to understand the text on one reading. Aim for grade 7-9 for general web content.

🔍 Gunning Fog Index

Estimates years of formal education needed, weighted heavily toward long, complex ("polysyllabic") words.

📜 SMOG Index

Designed for shorter passages; most reliable at 30+ sentences. Estimates grade level from complex-word density.

📑 Coleman-Liau Index

Uses letters-per-word and sentence length instead of syllable counting — often more stable on technical text.

🎯 Keyword density

How often your target phrase appears relative to total word count. Most SEOs target roughly 0.5%-2.5% — higher risks looking like keyword stuffing.

These are estimates, not guarantees. Readability formulas use syllable-counting heuristics that can misjudge proper nouns, jargon, and abbreviations. Treat the scores as a directional signal — combine them with an actual read-through before publishing.

Read the Complete Readability Guide →

Content Readability Checker

📊 Flesch Reading Ease

🎓 Flesch-Kincaid Grade

🔍 Gunning Fog Index

📜 SMOG Index

📑 Coleman-Liau Index

🎯 Keyword density

📊 Readability scores

🎯 Keyword density

⚠️ Sentences to simplify (25+ words)

💬 Other signals