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Free SEO tools
11 quick, single-purpose checks that answer one question well — no signup, no credit card, no PDF gate.
Meta Tag Checker
Test your title, meta description, Open Graph and robots tags against SEO best practice.
Robots.txt Tester
Parse any robots.txt and test whether a specific path is allowed or blocked for a crawler.
Core Web Vitals Checker
Real-user LCP, INP and CLS from the Chrome UX Report — mobile and desktop side by side.
Structured Data Validator
Validate every JSON-LD block on a page, list schema types and catch parse errors.
XML Sitemap Checker
Validate sitemap.xml, count URLs and sample-check that listed pages actually resolve.
Redirect Checker
Trace the full redirect chain hop by hop — spot loops, long chains and HTTPS downgrades.
llms.txt Generator
Generate a spec-compliant llms.txt file that points AI assistants at your key pages.
Broken Link Checker
Scan a page for internal links that return 404s or server errors.
AI Crawler Access Checker
See whether GPTBot, ClaudeBot, PerplexityBot and Google-Extended are allowed to read your page.
SSL Certificate Checker
Read a site’s TLS certificate: issuer, expiry, days remaining and hostname coverage.
Page Weight Analyzer
Measure how heavy a page is — HTML, scripts, stylesheets and images, byte by byte.
Why single-purpose tools?
Most SEO questions are small: is my title tag too long, is robots.txt blocking Googlebot, does my redirect chain loop, is there real-user Core Web Vitals data for my domain? You should not need an account or a 40-page report to answer them. Each tool here fetches exactly what it needs, applies the same thresholds our full audit engine uses, and shows you a plain pass/fail answer with the reasoning. When a quick check turns up something worse — slow field data, missing structured data, a pile of broken links — a full RankVitals audit runs Lighthouse plus 50+ SEO and AI-readiness checks across your site and turns the findings into a prioritized fix plan.
Core Web Vitals guides by platform
A tool tells you what is wrong. These guides cover how to fix it on the stack you actually run, with the platform-specific causes behind slow LCP, high INP and layout shift.
How RankVitals compares
- RankVitals vs GTmetrix — speed testing with SEO built in
- RankVitals vs PageSpeed Insights — when a free one-off test isn’t enough
- RankVitals vs Pingdom — Lighthouse depth vs uptime pedigree
- RankVitals vs WebPageTest — ease and coverage vs ultimate depth
- RankVitals vs DebugBear — the closest comparison, honestly scored
- GTmetrix alternatives
From the blog
- What actually breaks Core Web Vitals in 2026 — and how to find it
The six failure classes behind most bad LCP, TBT and CLS scores — how each one shows up, the exact fix with code, and which audit catches it.
- We built an MCP server so AI agents can run speed tests — here's how
Streamable HTTP with a stateless server, sha256-hashed API keys, and Postgres as the queue — the architecture behind our MCP server.
- How we run a GTmetrix-class testing stack on one small VPS
Postgres as the job queue after we deleted Redis, one Chrome at a time inside a 2 GB container, HAR files rebuilt from the DevTools log, and a deploy that is a tarball over SSH. The whole architecture, honestly.
- What 60 real Lighthouse runs say about what actually breaks LCP
We ran our own test engine against the 60 most-visited sites that will answer a mobile browser. The audits everyone fixes fail on fast sites too — here is what actually separates a 2-second LCP from a 5-second one.
- We audited 12 framework starter templates. 11 ship zero structured data.
We ran our 41-check SEO/AEO crawler over the official Next.js, Astro, SvelteKit and Nuxt starters — 85 pages. Full scores, the three checks almost everything fails, and the methodology.
Test your whole site in one run
Lighthouse speed test with waterfall and filmstrip, SEO + AEO audit, and an AI-generated fix plan — free.
Run a full site audit →