Readability Checker — Reading Level & Writing Score

Readability Checker — Analyze Reading Level & Writing Score

Check readability of any text directly in your browser. This readability checker highlights hard sentences, passive voice, adverbs, and complex words using Hemingway-style color coding. Get an instant readability score with Flesch Reading Ease, Flesch-Kincaid Grade Level, and three more formulas — all without leaving the page.

TWO WAYS TO CHECK READABILITY

Picker Mode — Reading Level Checker for Any Webpage
Click any element on a webpage to instantly analyze its readability. The extension highlights hard-to-read sentences, passive voice constructions, unnecessary adverbs, and complex words right on the page. Hold Shift to add multiple sections. See the reading level, writing score, and detailed quality metrics in the side panel.

Editor Mode — Built-In Writing Editor with Live Analysis
Open the full-screen editor to write or paste your text. Get real-time readability analysis as you type: sentence-level highlighting, readability score updates, word count, and reading time — all updating live. Click any highlighted sentence to get an AI-powered rewrite suggestion.

READABILITY FORMULAS

Five industry-standard readability formulas calculated instantly:

- Flesch Reading Ease (0–100 scale) — the most widely used readability checker formula
- Flesch-Kincaid Grade Level — shows the US school grade needed to understand the text
- Gunning Fog Index — estimates years of education required for comprehension
- SMOG Index — particularly accurate for technical and health content
- Automated Readability Index (ARI) — character-based readability test for precise measurement

Each formula provides a readability score that helps you understand how easy or difficult your text is to read. Compare scores across formulas for a comprehensive readability test.

WRITING QUALITY ANALYSIS

Beyond readability scores, the extension performs deep writing quality analysis:

- Hard Sentences — sentences that are difficult to read, highlighted in yellow
- Very Hard Sentences — sentences that are extremely complex, highlighted in red
- Passive Voice — passive constructions that weaken your writing, highlighted in blue
- Adverbs — unnecessary adverbs that dilute your message, highlighted in light blue
- Complex Words — words with simpler alternatives, highlighted in purple

Color-coded highlighting uses the CSS Custom Highlight API — no DOM modification, no copy-paste issues, works seamlessly on any webpage.

AI-POWERED WRITING TOOLS

Sentence Rewrite — Click any highlighted sentence in the editor to get an AI-suggested rewrite that improves clarity while preserving meaning.

Grammar Fix — Run a full grammar check on your text with one click. The AI corrects grammar, punctuation, and awkward phrasing.

KEYWORD DENSITY ANALYSIS

Track how often specific words appear in your text. The keyword density analyzer shows the top words by frequency with percentage calculations — useful for SEO content optimization and spotting repetitive language.

DETAILED METRICS

- Word count and character count
- Sentence count and average sentence length
- Reading time estimate
- Paragraph count
- Complex word percentage
- Writing score summary with issues and strengths

WHO IS THIS FOR

- Writers and Bloggers: Check readability before publishing to ensure your content reaches the widest audience
- Students: Verify that essays and papers meet the required reading level for your assignment
- Content Creators: Analyze writing quality and optimize for engagement
- SEO Specialists: Use as a reading level checker to match content to your target audience grade
- Editors and Proofreaders: Spot hard sentences, passive voice, and complex words instantly
- Teachers and Educators: Evaluate reading materials for grade-level appropriateness
- Non-Native English Speakers: Improve writing clarity with real-time analysis and AI rewrite suggestions

LIKE HEMINGWAY EDITOR, BUT IN YOUR BROWSER

If you use Hemingway Editor to check your writing, this extension brings the same Hemingway-style analysis to any webpage or text field. No need to copy-paste into an external tool — analyze readability right where you write. Plus, you get five readability formulas instead of one, AI-powered rewrites, and keyword density analysis.

SUPPORTED LANGUAGES

Readability analysis and sentence detection work across 30+ languages. The extension interface is translated into 30+ locales. AI rewrite and grammar fix features are available in English.

PRIVACY

All readability analysis runs locally in your browser. Your text is never sent to external servers for scoring. AI features (sentence rewrite and grammar fix) use a secure server connection only when you explicitly request them.

Install this readability checker and start improving your writing today.