Readability Scorer — Flesch, Grade Level & More

Measure how easy any text is to read with the Readability Scorer. Paste an article, blog post, email or document and get every major readability metric — Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau and the Automated Readability Index — plus word, sentence and syllable counts and a plain-English difficulty label. Export as JSON, CSV or Excel.

Perfect for SEO and content teams, editors, educators, UX writers and accessibility checks, it tells you whether your writing matches your audience's reading level — instantly, with no setup.

What it does

• 📖 All the standard scores — Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, SMOG Index, Coleman-Liau Index and Automated Readability Index (ARI).
• 🏷️ Plain-English label — a readable "Very easy → Very difficult" band alongside the Reading Ease score.
• 🔢 Underlying counts — words, sentences, syllables, characters, complex words, words-per-sentence and syllables-per-word.
• 📚 Batch scoring — score a whole list of texts in one run, each labelled by document.
• 👀 Preview column — a short snippet of each text so results are easy to scan.
• 📤 Export anywhere — JSON, CSV or Excel, or straight into a spreadsheet or content dashboard.

Example output

{
  "documentIndex": 0,
  "preview": "The cat sat on the mat. The dog ran fast...",
  "wordCount": 16,
  "sentenceCount": 3,
  "fleschReadingEase": 116.82,
  "readingEaseLevel": "Very easy",
  "fleschKincaidGrade": -1.71,
  "gunningFog": 2.13,
  "smogIndex": 3.13,
  "colemanLiauIndex": -4.44,
  "automatedReadabilityIndex": -5.22
}

How to use it

1. Paste your text (or add several texts in the list).
2. Run, and download the scores as JSON, CSV or Excel.

Input fields

Field	Description
Text	The text to score.
Multiple texts	Optional list of separate texts to score in one run.
Max results	Maximum number of texts to score (0 = no limit).

Output fields

documentIndex, preview, wordCount, sentenceCount, syllableCount, characterCount, complexWordCount, wordsPerSentence, syllablesPerWord, fleschReadingEase, readingEaseLevel, fleschKincaidGrade, gunningFog, smogIndex, colemanLiauIndex, automatedReadabilityIndex.

Understanding the scores

• Flesch Reading Ease — higher is easier (90+ very easy, 60–70 standard, under 30 very difficult).
• Flesch-Kincaid Grade / Gunning Fog / SMOG / Coleman-Liau / ARI — US school-grade levels; lower means more accessible.

Popular use cases

• SEO & content — keep articles at a reading level that ranks and converts.
• Editing & UX writing — flag copy that's too dense before it ships.
• Education — check that materials match a target grade level.
• Accessibility — ensure public-facing text is broadly understandable.
• Bulk audits — score an entire content library at once and sort by difficulty.

FAQ

Do I need an account or key? No. Paste your text and run.

Which languages are supported? The metrics are designed for English text. Other languages will produce numbers but the scales are calibrated for English.

Can I score many texts at once? Yes — add a list of texts and each is scored separately, with a document index on every row.

How are syllables counted? With a well-established English syllable heuristic. As with all readability tools, unusual words may vary slightly, but scores are consistent and comparable across texts.

Can I export to Excel or Google Sheets? Yes — results download as JSON, CSV or Excel and integrate with Sheets and dashboards.

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Know your text's reading level at a glance — Flesch, Grade Level, Gunning Fog and more — scored and export-ready for SEO, editing and accessibility.