CheckSEO.dev
Free SEO tools to check, audit, and fix your website.
CheckSEO is a collection of 84 free tools for website owners, developers, marketers and YouTube creators — with a full-site audit that runs every on-page and technical check at once and returns one AI-synthesized health score. No signup, no paywall.
Everything in one place
Full-Site Overviews
Run every check at once and get one score to start from.
On-Page SEO
Title tags, headings, images, and content — what search engines read first.
Technical SEO
Redirects, sitemaps, and crawl rules — the plumbing search engines depend on.
Domain & Network
DNS, certificates, headers, and registration — what's true about a domain before any page loads.
Structured Data
Generate the JSON-LD markup search engines use for rich results.
Social Sharing
How your links actually look when they're shared.
Developer Utilities
General-purpose tools that don't need a URL at all.
YouTube Tools
For creators — no API key, no login.
Real SEO tools, no financial barrier
We believe websites of all sizes should have the same visibility into their own SEO that larger companies pay for. Every tool is free, with minimal data collection and results you can trust.
- 84 free tools, growing every month
- No signup required to run any check
- Real-time analysis with instant results
- Actionable recommendations for every issue found
- A full-site audit that runs everything at once
- An AI-synthesized health score across performance, SEO, content and technical checks