Keyword Density
Analyze keyword usage.
OpenCheck content readability. - runs entirely in your browser. Free, fast and private.
Add marketing copy or blog content to score.
Flesch-Kincaid and related scores calculate locally.
See reading ease, grade, and sentence complexity metrics.
Edit sentences until the score matches your audience.
Readability Checker is a free seo toolkit utility on OneDevToolkit. Check content readability. It runs in your browser for this session - use the workspace on this page to try it.
Need a related step? Open the SEO Toolkit hub at /seo-tools/ or the <a href="/blog/">blog</a> for longer workflows.
Processes data instantly with no server round-trips.
Your data never leaves your browser. Nothing is uploaded.
Works in any modern browser. Nothing to download or install.
No limits, no sign-up, no credit card required.
Works on desktop, tablet and mobile devices.
Beautiful in both themes. Your preference is saved.
Keyboard shortcut
Use Readability Checker to preview or draft SEO markup locally before publishing.
Check titles, descriptions, and structure without uploading unpublished pages.
Copy snippets into templates or a CMS after you review them.
Answers for this tool. For site-wide help, open the FAQ hub.
Readability Checker check content readability. Results are generated locally so drafts stay private.
No tool can guarantee rankings. Use outputs as checklists alongside Search Console and quality content.
Most OneDevToolkit SEO helpers analyse text you paste and do not require API keys. Live SERP scraping is not performed in your browser session.
Yes - copy HTML snippets into your site templates or CMS fields after review.
Always tailor titles and descriptions to the real page intent. Generators accelerate drafts; humans approve final copy.
Paste content in the target language. Character counts still apply for SERP display limits.
Validate JSON-LD with Google’s rich results tools after exporting from generators on OneDevToolkit.
Pasted drafts stay in your browser for client-side analysers. Do not paste unpublished legal text if policy forbids any web tool.
Pair Readability Checker with siblings in SEO Toolkit for previews, sitemaps, and robots checks.