37 free SEO tools
Check what Google and AI crawlers see, fix your tags, and generate the files they look for. No signup.
AI crawlers & agents
What ChatGPT, Claude, Perplexity and AI agents can reach and read.
AI Bot Access Checker
Test robots.txt and a live request for GPTBot, ClaudeBot, PerplexityBot and the agent user-agents. Catches firewall blocks.
AI Crawler View
See the text an AI crawler gets without running JavaScript, and whether your page is an empty shell.
Agent Discovery Checker
Look for markdown pages, MCP server cards, API catalogs, agent cards, UCP and signed-agent keys.
llms.txt Checker
Fetch and validate /llms.txt and /llms-full.txt against the llmstxt.org format.
Crawling & indexing
Whether search engines can fetch, follow and index your pages.
Indexability Checker
Find out if a page can be indexed, and exactly what's blocking it.
robots.txt Checker
Fetch robots.txt and test any path against Googlebot and AI bots.
XML Sitemap Checker
Parse a sitemap or sitemap index, count URLs and list entries.
Googlebot Simulator
Fetch a page as Googlebot and as a browser, and compare what each gets.
Redirect Checker
Follow the full redirect chain hop by hop. Catch loops and downgrades.
Canonical Checker
Compare the final URL after redirects with rel=canonical.
HTTP Headers
Grade security headers (HSTS, CSP, frame protection) and show the full response.
Snippet Eligibility Checker
Check nosnippet, max-snippet, data-nosnippet and X-Robots-Tag: the switches that decide if AI Overviews and Copilot can quote you.
Page Speed Test
Core Web Vitals and lab metrics from Google PageSpeed Insights.
On-page
Titles, meta tags, headings, links and keywords on a live page.
Meta Tag Analyzer
Title, description, canonical, robots, Open Graph and Twitter tags in one view.
Heading Analyzer
Check the H1 to H6 outline and spot skipped or duplicate headings.
Outbound Link Checker
Every external site a page links to, parsed from the HTML.
Keyword Density
Word and phrase frequency, and over-optimization warnings.
Answer-First Checker
Does the page open with a quotable answer? Checks the lead paragraph, section lengths, lists and numbers in the raw HTML.
Content Freshness Checker
Find every date a page exposes (visible, JSON-LD, meta, sitemap lastmod, headers) and check that they agree.
Headline Analyzer
Score a headline on length, power words and clarity.
Generators
Paste-ready tags, schema, robots.txt, sitemaps and llms.txt.
Title Tag Generator
Title patterns with length hints and an optional brand suffix.
Meta Description Generator
Description drafts sized for search snippets.
Schema Generator
JSON-LD for Article, Product, FAQ, Organization and more.
robots.txt Generator
Build robots.txt rules, AI bot choices and sitemap lines.
llms.txt Generator
Write an llms.txt file in the llmstxt.org format from your name, summary and key links.
Sitemap Generator
Turn a list of URLs into XML sitemap entries.
URL Slug Generator
Clean, readable URL slugs from any title.
Authority & brand
Domain Rating, and the brand, entity and popularity signals that matter as much.
DR Reality Check
Your Ahrefs DR next to the signals that track AI visibility as well or better: entity, Wikipedia, community and popularity.
Authority Compare
Put up to 5 domains side by side on DR, Tranco rank, Wikidata, Wikipedia links and Hacker News mentions.
Domain Rating (bulk)
Ahrefs Domain Rating for up to 10 domains at once.
Keywords
Find and combine the searches worth targeting.
Previews
See how a page looks in Google and when it is shared.
Calculators & utilities
Budget, ROI and data helpers.
Want all of this in one scan?
The site audit checks everything at once and scores SEO, AI Search and Agent Readiness.
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