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Check Readability
What it is
Check Readability analyzes text and returns nine readability scores together with a consensus grade level. Its formulas include Automated Readability Index, Flesch Reading Ease, Gunning Fog, Flesch-Kincaid Grade Level, Coleman-Liau, SMOG, LINSEAR Write, FORCAST, and New Dale-Chall. The web analyzer gives immediate feedback on complexity, sentence length, and word choice. A Chrome extension adds a native Side Panel, full-page or selected-text extraction, and interactive formula breakdowns. It calculates scores locally in the browser without transmitting page content or selected text. Text submitted to the website is sent over an encrypted connection and held in memory only during scoring; the site says it is not logged or written to a database. Google Analytics is used for visits and general browser and referral information, not analyzed text. The product says readable content may support accessibility and search rankings. The free plan costs nothing, requires no account, and permits personal and commercial use. Its terms caution that formula results are estimates and cannot assess whether writing is accurate, logical, appropriate, or well argued.
For and against
For
- Returns nine readability scores and a consensus grade
- Provides feedback on sentence length and word choice
- Chrome extension supports selected-text extraction
- Extension scoring stays local in the browser
- Free plan requires no account or usage fees
Against
- Supports English language analysis
- Scores cannot judge accuracy or logic
- Web submissions are processed in memory during scoring
The verdict
Check Readability offers several formula-based ways to review text complexity, through its website or Chrome extension. Treat the scores as estimates rather than judgments of writing quality or correctness.
Who it suits
The tool suits writers, editors, educators, researchers, and SEO specialists who want readability estimates for English text. The Chrome extension is designed for copywriters, SEO specialists, editors, researchers, and educators.
Plans and prices
Free
9 readability formulas · no account · no usage fees · personal and commercial use
Read 15 Oct 2026 · checkreadability.com
On the record
- Accessibility
- The product says readable content can improve accessibility for people with reading difficulties.checkreadability.com · read 30 Sep 2026
- Account requirement
- The service does not require account creation.checkreadability.com · read 15 Oct 2026
- Accuracy limitation
- The terms warn that statistical formulas cannot judge accuracy, logic, appropriateness or quality of argument.checkreadability.com · read 15 Oct 2026
- Actionable feedback
- The site says its results explain what makes text difficult and how to improve it.checkreadability.com · read 15 Oct 2026
- Analysis
- The site provides immediate feedback on text complexity, sentence length, and word choice.checkreadability.com · read 30 Sep 2026
- Analytics
- The website uses Google Analytics for page visits, rough geographic region, browser type, and referring site, but not analyzed text.checkreadability.com · read 30 Sep 2026
- API and SDKs
- The reviewed maker pages describe no public API, SDK or developer integration package.checkreadability.com · read 15 Oct 2026
- Availability limitation
- The terms provide the service as-is and as-available without guaranteeing uninterrupted access.checkreadability.com · read 15 Oct 2026
- Chrome extension
- The browser extension analyzes selected text or complete webpages through Chrome's native Side Panel.chromewebstore.google.com · read 15 Oct 2026
- Chrome listing
- The Chrome Web Store listing describes the extension as free and reports version 1.2.0 updated September 4, 2026.chromewebstore.google.com · read 30 Sep 2026
- Coleman-Liau
- The Coleman-Liau metric estimates readability from character counts rather than syllable counts.checkreadability.com · read 15 Oct 2026
- Commercial use
- The terms allow personal and commercial use, including checking work written for clients or employers.checkreadability.com · read 15 Oct 2026
- Developer identity
- The Chrome listing gives the developer email [email protected] and marks the developer as a non-trader.chromewebstore.google.com · read 15 Oct 2026
- Extension extraction
- The extension can extract full webpage body text or analyze a selected block with one click.chromewebstore.google.com · read 15 Oct 2026
- Extension features
- The extension provides a native Chrome Side Panel, full-page or selected-text extraction, interactive formula breakdowns, and nine readability formulas.checkreadability.com · read 30 Sep 2026
- Extension news
- A maker article dated September 2, 2026 announced the Chrome extension as a new native Side Panel tool.checkreadability.com · read 15 Oct 2026
- Extension package
- The Chrome listing reports a size of 54.35 KiB and English as its language.chromewebstore.google.com · read 15 Oct 2026
- Extension privacy
- The Chrome listing says scoring runs locally, with zero tracking and no data collected.chromewebstore.google.com · read 15 Oct 2026
