Audit any URL in 8 seconds across 70+ ranking signals — AI search visibility, real Core Web Vitals, mobile-first scoring. An AI Coach generates the actual fix — <meta> tags, schema JSON-LD, title rewrites — right in the conversation. Hours of SEO work, done in minutes.
42 SEO checks · captured 2026-05-19
Google will auto-generate one from your page content — and it's rarely as compelling as one you write.
Missing alt text hurts accessibility and misses Google Images ranking opportunities.
Without dimensions, the browser causes layout shift (CLS) — a Core Web Vitals factor Google penalizes.
↓ Run the same audit on your URL below — it's free, no signup
Audits any stack — CMS, framework, headless, or hand-rolled
Built by operators, not marketers
Real SEO operator experience across agency and portfolio sites
Portfolio of revenue-generating properties tested against the same checks
Has actually moved rankings on a live site — not a generic checklist
Most free SEO audit tools haven't shipped a single check for ChatGPT, Perplexity, or Gemini visibility. SEOSpectator scores AI search readiness alongside classic SEO — so your site is ranked correctly in the era when 20%+ of qualified discovery comes through AI search.
70+ checks, parallelized at the edge. Other tools take a full minute. We deliver before you finish reading the loading message.
Most SEO tools haven't shipped a single AI search check. We score llms.txt, AI crawler accessibility (GPTBot, PerplexityBot, Google-Extended), AI-friendly schema, and semantic-HTML readability — the signals that decide whether ChatGPT or Perplexity cite your site.
Google's index has been mobile-first since 2021. Most audit tools weight desktop and mobile equally. We weight mobile signals 1.5x — matching how Google actually ranks your site.
Most free SEO checker tools give you a number and a vague list. SEOSpectator runs 70+ checks in parallel at the edge, scores every signal that actually moves rankings, and shows you a prioritized fix list — not a data dump.
Type or paste the URL you want audited. No signup, no account, no payment — just the URL. The free SEO audit tool runs immediately on whatever page you give it.
We crawl the page, fetch real Core Web Vitals from Google's PageSpeed Insights API + CrUX field data, parse schema, reconcile JS-rendered DOM for SPAs, and score 70+ signals across technical, on-page, schema, AEO, and mobile categories.
Results page shows your score out of 100, a category breakdown, and the top fixes ranked by ranking impact. Every issue has a plain-English explanation and the exact change to make — not generic SEO advice.
We've been deliberately scope-limited — no backlink database, no keyword research — so we can build the deepest, most accurate audit experience in the market.
As of May 2026, none of the major free SEO audit tools (Ahrefs Webmaster Tools, Semrush free tier, Ubersuggest, Sitechecker, SE Ranking free) has shipped a single check for AI search visibility. We score llms.txt presence and validity, robots.txt rules for GPTBot / PerplexityBot / Google-Extended / CCBot / Applebot-Extended, AI-friendly schema types (Article, FAQ, HowTo, Product), and semantic-HTML readability for LLM extraction. When 20%+ of qualified discovery comes from AI search, you need an SEO analyzer that scores both Google AND the answer engines.
Most free website SEO audit tools run a synthetic Lighthouse pass and call it Core Web Vitals. That's not what Google uses to rank — Google ranks on field data from real Chrome users via the Chrome User Experience Report (CrUX). Our audit hits Google's official PageSpeed Insights API for both Lab and Field data, so the LCP, INP, and CLS scores you see are exactly what Google's ranking algorithm sees.
Google's index has been mobile-first since 2021. Most SEO checker tools still weight desktop and mobile equally, which means their score doesn't match how Google actually ranks you. We weight mobile signals 1.5x — viewport meta, tap targets, font sizes, mobile LCP, mobile INP — to produce a score that aligns with what Google's mobile-first index sees first.
Every static-HTML audit gives false negatives on React / Vue / Angular / Next.js sites because the content isn't in the initial HTML. We run a parallel Lighthouse rendered-DOM check and reconcile the two — if the static HTML says “missing H1” but the rendered DOM has it, we mark the check passed. Few free SEO audit tools do this; most flag your SPA with dozens of false errors and you waste hours debugging issues that don't exist.
Other free SEO analyzers take 60-300 seconds because they run checks serially. We parallelize all 70+ at the edge — technical, on-page, schema, AEO, performance, international — and serve from a global edge network for sub-100ms latency anywhere in the world. The full audit completes before competitor tools have finished loading their progress bar.
Built for the four people who need accurate SEO scoring without an enterprise budget.
Get an Ahrefs-quality audit without the $129/month subscription. Ideal for indie bloggers, Substack writers, personal portfolio sites, and side projects.
White-label-quality reports for client audits without the Ahrefs/Semrush enterprise cost. Run unlimited audits during onboarding, pitch meetings, and quarterly reviews — global edge network keeps every site fast no matter where you serve.
Quick SEO health check before major launches, after big deploys, or to debug a sudden rank drop. The 8-second audit fits into your CI workflow; the JS-render reconciliation means your Next.js/React app scores correctly.
Audit product pages, category pages, and landing pages with the schema markup checker, mobile-first scoring, and product schema validation. AEO scoring helps your products surface in ChatGPT product recommendations.
Accessible pricing for every team · accepted in 100+ countries · cards, UPI, netbanking, wallets · cancel anytime · no credit card to start the free tier.
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Used by SEO teams worldwide · accessible pricing for every budget · no enterprise sales call required
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300+ cities, sub-100ms response globally
SLA-backed on Business plan and above
Built on the most capable AI model available
Yes — 100% free during launch, no credit card, no signup required to run an audit. Unlimited audits, all 70+ checks, on any URL. Pro plans are live for power users who want unlimited audits, an AI Coach without per-audit caps, and continuous monitoring — but every site owner can get a complete audit forever without paying anything.
70+ signals across six categories: Technical SEO (status codes, redirects, robots.txt, sitemap, canonicals), On-page (title tag, meta description, H1/H2 hierarchy, image alt text, internal linking), Schema markup (Organization, Article, Product, FAQ, HowTo, BreadcrumbList, validation), AEO/AI search (llms.txt, AI crawler accessibility, AI-friendly schema), Core Web Vitals (LCP, INP, CLS, FCP, TTFB from real Google PSI + CrUX field data), and International SEO (hreflang declarations, multi-region targeting, currency/locale signals, mobile-first weighting which matters more in mobile-dominant markets).
Three concrete differences: (1) AEO scoring — we score AI search visibility (ChatGPT, Perplexity, Gemini, Copilot) which no other free SEO checker has shipped a single check for. (2) Real Core Web Vitals — most free tools run synthetic Lighthouse; we use Google's official PSI API + CrUX field data, so the LCP/INP/CLS scores match what Google's ranking algorithm sees. (3) JS-render reconciliation — most free SEO audit tools fail on SPAs (React, Vue, Next.js) by reading only static HTML; we reconcile against rendered DOM so single-page applications score correctly.
AEO = Answer Engine Optimization. As ChatGPT, Perplexity, Gemini, and Copilot become major discovery channels (already 20%+ of qualified discovery for many B2B SaaS sites), being visible in AI search matters as much as Google ranking. We score llms.txt presence + validity, robots.txt rules for AI crawlers (GPTBot, PerplexityBot, Google-Extended, CCBot, Applebot-Extended), AI-friendly schema types (Article, FAQ, HowTo, Product), and semantic HTML for LLM extraction. Most legacy SEO analyzer tools haven't shipped any of these checks yet.
Yes — and this is where most free SEO audit tools fail. Single-page applications (SPAs) render content in JavaScript after the initial HTML loads. Most audit tools read only the static HTML and report dozens of false negatives ("missing H1", "missing meta description", "missing content"). SEOSpectator runs a parallel Lighthouse rendered-DOM check and reconciles the two — if the rendered DOM has the content, we pass the check. Next.js, React, Vue, Angular, Svelte, Astro sites all score correctly.
Yes. Google has been mobile-first since 2021 — meaning Google indexes the mobile version of your site, not desktop. Most free SEO audit tools still weight desktop and mobile signals equally. SEOSpectator weights mobile signals 1.5x (viewport meta, tap targets, font sizes, mobile LCP, mobile INP) so the score aligns with how Google's mobile-first index actually ranks you. Run an audit on your mobile URL to see your true rankable score.
For on-page and technical SEO audits, accuracy is on par with paid tools — we use the same upstream data sources (Google PSI API, CrUX field data, schema.org spec). Where Ahrefs and Semrush genuinely win: backlink databases (they have 20-40 trillion pages crawled, we have zero — we're not in that game) and keyword research databases. For audit + on-page workflow, our 70+ checks are at least as deep as Ahrefs Site Audit or Semrush Site Audit — and we add AEO scoring, JS render reconciliation, and mobile-first weighting that neither has.
Yes — there are no per-user audit limits during free launch. Run as many audits as you need: audit your homepage, then your top product pages, then your blog posts, then your competitors. The 8-second runtime means a 20-page site audit takes under 3 minutes of waiting.
Yes — SEOSpectator audits any URL on any TLD, in any language. The audit includes international SEO checks (hreflang declarations, multi-region targeting via the alternates spec, currency/locale signals, regional language meta tags, mobile-first weighting which matters more in mobile-dominant markets). Used by teams shipping in 30+ countries from the US, UK, EU, India, LATAM, and SEA.
No. Paste a URL on the homepage, get an audit. No email, no password, no credit card, no "start your free trial". Audit results are public-by-URL so you can bookmark or share them. Sign-up is optional and only useful if you want to save your audit history.
SEOSpectator is built by a small team of SEO operators with 8+ years of experience across 11+ portfolio sites and agency work. Every check is one that's actually moved rankings on a live site — not a copy of a generic SEO checklist. Performance data comes from Google's official PageSpeed Insights + Chrome User Experience Report (the same data Google ranking uses).
Pro is live now. Today: unlimited audits, AI Coach with a 60-message rolling pool that resets across 3 days (20 msgs/day average · burst when you need it · Claude Sonnet quality), AI Auto-Fix that writes the actual HTML/JSON-LD patch (unlimited for Pro · 1/audit for Free), full-site crawl audits (up to 25 pages per scan with site-wide aggregate report showing average score + worst-performing pages), week-on-week audit diffs, audit history dashboard, multi-site dashboards (agencies + multi-brand teams), unlimited saved reports with 1-year retention. Shipping Q4 2026 (Pro Yearly only): public API access. See /pricing for live rates in your currency — Founding Members lock in lifetime Pro for one payment.
Free forever for 5 audits/month. No credit card. No setup. Just paste a URL.