How it works
Enter your content and target keyword. The tool instantly calculates word count, sentence count, keyword density, and readability (Flesch-Kincaid approximation). Then use the AI buttons to get optimization suggestions and meta title/description ideas from GPT — 10 free queries per day, or use your own OpenAI API key for unlimited access.
More tools
Keyword Research
Volume, CPC & competition data.
SERP Preview
Preview your Google result.
Semantic HTML
Check semantic structure.
How does the scoring work?+
The content score combines keyword density (ideal: 1–3%), readability (Flesch-Kincaid), content length (300+ words recommended), and sentence variation. Higher scores indicate better on-page SEO alignment for your target keyword.
Is the AI analysis free?+
Yes — you get 10 free AI queries per day (shared across all AI features). For unlimited use, enter your own OpenAI API key. The client-side analysis (word count, density, readability) always works without limits.
AI content tools in your browser
The Lumina extension includes AI content optimization, keyword research, and more — directly in your toolbar.
Add Lumina to Chrome — Free