Free SEO Audit Tool: 31-Point Site Audit + AI Search Visibility Check

Yes, the free SEO audit tool is completely free. No credit card, no trial, no paywall on the SEO report. You get all 31 on page SEO and technical SEO checks plus the AI deep-dive at zero cost. The catch is you join the weekly SEO and AI newsletter, which you can unsubscribe from with one click. If the SEO audit is useful and you ever need a human to dig deeper into your site, you will remember the source.

The free SEO audit tool runs 31 checks across three categories: 24 on page SEO and technical SEO signals (title tag, meta description, H1 heading, meta tags, structured data, canonical URL, mobile viewport, render-blocking CSS, page speed proxy, Core Web Vitals signals, text-to-HTML ratio, image alt text, keyword consistency, heading structure depth, internal links balance, URL SEO structure, DOCTYPE and encoding) and 7 AI search visibility checks (AI crawler access in robots.txt, llms.txt presence, FAQ schema, author schema, HSTS security header, sitemap.xml discovery, HTML lang attribute). Each check produces a pass, warn, or fail with a specific fix recommendation.

Free SEO checker tools from Semrush, Ahrefs, and Moz focus on backlink analysis and keyword research. This SEO audit tool focuses on on page SEO health, technical SEO issues, and AI search visibility, which the big-brand free SEO tools largely ignore. It complements Google Search Console and Google Analytics rather than replacing paid SEO checkers. Use this audit tool for site health and AI visibility. Use Semrush or Ahrefs for backlink data and keyword research. Use Looker Studio or Google Search Console for keyword rankings and historical data.

GEO stands for Generative Engine Optimization. It is the practice of making your site discoverable and citable by AI search engines like ChatGPT, Claude, Perplexity, and Google AI Overviews. This audit checks 7 GEO-specific signals: AI crawler access in robots.txt, llms.txt file, author schema, AI-answer schema (FAQPage, Article, HowTo), HSTS security header, sitemap.xml discovery, and HTML lang attribute. Classic SEO checker tools skip all of these. AI search results are a growing share of how users find businesses, so AI visibility is no longer optional.

GPTBot (OpenAI), ClaudeBot (Anthropic), PerplexityBot, and Google-Extended are AI crawlers that index the web so their AI platforms can cite sites in their answers. If you block them in robots.txt, often by accident, your content will never appear in ChatGPT, Claude, or Perplexity answers. That is a major source of 2026 referral traffic to leave on the table. The SEO audit tool checks your robots.txt for these AI crawler access rules and flags any that are blocked.

An llms.txt file is a markdown file at your site root (/llms.txt) that gives AI engines a curated guide to your best content. Think of it as a sitemap plus executive summary for large language models. It takes about 30 minutes to write and produces a large AI visibility payoff. The free SEO audit tool checks whether you have one and validates its structure. Sites with a well-structured llms.txt see meaningfully higher AI citation rates than sites without one.

Each of the 31 checks has a weight from 1 to 10 based on real-world ranking impact. The overall SEO score is the weighted average across all checks, expressed out of 100 with a letter grade A through F. Critical SEO issues like missing H1, no HTTPS, or NOINDEX directives carry the highest weight. Cosmetic items like favicon presence carry the lowest. The site health score reflects what actually moves search engine rankings, not vanity metrics. Most real sites score 55 to 80. If you score 90+, you are doing well.

Two reasons. First, you get the full SEO report in your inbox so you can return to it whenever you need to fix issues. Second, the audit tool consumes server resources and AI tokens for every site audit, so we ask for a real business email in exchange. Fair trade. Disposable and Gmail+alias addresses are blocked. Your email is never shared.

No. Around 250 disposable email domains are blocked. The Gmail +alias trick also will not work, since we normalize those back to the root address. Please use a real business email to receive your detailed SEO report and historical site health data.

Max 3 audits per email per 24 hours. Running the same URL twice within 24 hours returns your existing SEO report rather than running the entire site audit again, which saves compute time and gives you a stable baseline to track fixes against. After 24 hours you can re-audit and compare results to see whether your fixes improved the overall SEO score.

The audit covers a single URL deeply rather than crawling your entire site. It measures a page speed proxy and Core Web Vitals signals from the rendered HTML, scans for render-blocking CSS, and audits internal links on the page. For broken links across an entire site or deeper crawl depth analysis, pair this audit tool with Screaming Frog (free up to 500 URLs). For live rank tracking, use Looker Studio with Google Search Console data.