New - now live on the Chrome Web Store
Check readability without leaving the page
The Check Readability extension brings all nine formulas into Chrome's side panel. Open it on any article, draft, or competitor page and get an instant grade level - no copying, no pasting, no uploads.
What it does
Lives in the side panel
Chrome's native side panel keeps the scores next to the page you are reading - no popup to lose, no tab switching, nothing covering your content.
Whole page or just a selection
Analyze an entire article with one click, or highlight a paragraph to score only the part you care about. Text is pulled live from the page.
Consensus dashboard
All nine formulas at a glance, plus the average grade level and recommended reading age so you get one number to act on.
Formula popovers
Tap any score to see the equation behind it and how your text produced that number - the same explanations as the website.
Dark and light themes
Follows the look you prefer, so it sits comfortably alongside whatever you are reading.
100% private and local
Scoring happens inside your browser. The extension collects no data and sends nothing to a server - your drafts and client work stay yours.
Nine formulas, one panel
The extension computes exactly the same formulas as this site, so scores match whichever one you use. Each links to a full explanation here.
Getting started
- 1
Install it from the Chrome Web Store - it takes one click and no sign-up.
- 2
Pin the extension so its icon stays visible in your toolbar.
- 3
Open any page and click the icon to launch the side panel.
- 4
Score the whole page, or select a passage first to analyze just that text.
Who it is for
- Writers and editors checking a draft before publishing
- SEO and content teams auditing competitor pages
- Teachers and students matching texts to reading levels
- UX writers and support teams keeping help docs clear
- Health and government communicators held to plain-language standards
Your text never leaves your browser
Every score is computed locally by the extension. It collects no analytics, stores no documents, and asks for no account - which is what makes it safe to run on unpublished drafts and client work.
Prefer the browser? The web analyzer does the same job with no install.