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Practical guides, free checkers, original research, and plain-English definitions to help your website get found by Google and cited by AI.
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Run a free SEO and GEO audit and see the highest-impact improvements first.
Choose a checker →↗Learn the fundamentals
Understand technical SEO, content quality, and how AI search discovers sources.
Browse essential guides →⌁Explore AI search data
See first-party citation benchmarks with transparent samples and methodology.
View the research →More original research: Crawl StudiesHow we track AI citations of our own promptsHow our research sweep of public websites worksHow Many Websites Have an llms.txt File?How Many Websites Block AI Crawlers?How Many Websites Use JSON-LD Structured Data?How Many Websites Lack a Meta Description?How Many Websites Have No XML Sitemap?How Many Websites Miss Image Alt Text?How Many Sites Skip Privacy, Contact or About?
Recommended reading
Essential guides
Browse all 30 Learn guides ↓Show fewer Learn guides ↑
- Google Analytics for SEO: Reading GA4 the Right WayGoogle Analytics for SEO means watching what organic visitors do after they land, not just how many of them show up.
- SEO in Digital Marketing: Where It Fits in the MixSEO in digital marketing is the compounding, long-term layer that sits alongside paid search, content, email, and social.
- What Are Backlinks and Why Do They Matter for SEO?Backlinks are links from other websites to yours, and they matter because search engines read them as a vote of trust in your content.
- How Long Does SEO Take to Work? A Realistic TimelineThere is no fixed number of weeks or months that applies to every site, since ranking depends on crawling, indexing, and signal accumulation.
- Canonical URLs Explained: When and How to Use ThemCanonical URLs tell search engines which version of a page to index when several URLs serve the same or similar content.
- Internal Linking Best Practices That Actually WorkInternal linking best practices come down to one idea: treat your link graph as a deliberate routing system, not an accident.
- How to Fix Duplicate Content: Causes and RepairsDuplicate content gets fixed by matching the cause to the tool: canonical tags, 301 redirects, internal linking fixes, or noindex.
- Crawling vs Indexing Explained: A Diagnostic WalkthroughGoogle can reach a page without ever adding it to the index — crawling vs indexing explained with a real Search Console diagnostic walkthrough.
- Google Search Console for SEO: What Actually MattersGoogle Search Console for SEO comes down to four things: ownership, your sitemap, the Performance report, and Index Coverage.
- Bottom of Funnel Keywords: A Playbook for Pages That ConvertBottom of funnel keywords are searches that name a category plus a qualifier — and they signal someone ready to choose, not learn.
- How to Optimize for Search Intent (Practical Guide)Search intent matching is an ongoing research step, not a one-time guess you make while outlining a page — here's how to check it and keep checking it.
- How to Do Keyword Research: A Step-by-Step GuideKeyword research is the process of finding phrases your readers search, then picking ones you can realistically rank for with your site's authority.
- How Do Search Engines Work? Crawling, Indexing, RankingSearch engines work by running every page through three stages — crawling, indexing, and ranking — and a failure at any one blocks the rest.
- How Googlebot Crawls Your Site: Budget, Waste & ChecksLearn how Googlebot crawls your site in practice: crawl budget limits, what wastes it, and how to check real crawl activity in Search Console.
- SEO vs SEM: Cost, Speed, and Which to Use FirstSEO vs SEM compared on cost, speed, and permanence — plus why a new site often needs SEM first while SEO compounds in the background.
- Technical SEO Basics: A Primer for Site OwnersLearn the technical SEO basics — page speed, mobile-friendliness, HTTPS, crawlability, and structured data — before tackling deep-dive guides.
- AI Overviews: What They Are and How They WorkAI Overviews are AI-generated summary boxes inside standard Google Search results, distinct from Google's separate full-page AI Mode.
- Bing Copilot SEO: Why Bing Indexing Comes FirstMicrosoft Copilot and Bing Chat generate answers using the Bing index, not Google's, so Bing indexing is the real Copilot SEO blocker.
- Claude AI Citations: How Anthropic's Claude Cites SourcesHow Claude AI citations actually work: ClaudeBot training crawls vs. live web-search retrieval, and what makes content quotable.
- Gemini AI Visibility: Grounded vs. Training-Data AnswersGemini AI visibility depends on which of two retrieval paths Gemini uses to answer a given query, each with different rules for showing up.
- GEO vs SEO: What Actually Differs (and What Doesn't)GEO and SEO optimize for different outputs built on the same underlying content, and knowing where they split matters for strategy.
- Google AI Mode SEO: What's Confirmed vs. Still UnknownGoogle AI Mode is a separate, full-page conversational search experience, not a box inside your normal results but an entirely different surface.
- How to Appear in Google AI OverviewsRanking well in standard organic search is the precondition for appearing in Google AI Overviews — here's what actually moves the needle.
- How to Get Cited by Perplexity: Citation MechanicsPerplexity answers most queries with a live web search, then cites specific pages inline — here's what that means for getting cited.
- SEO Statistics 2026: What 6,767 Real Homepages ShowI drew 10,000 websites at random and scanned 6,767 homepages. 54% carry no structured data, 32% no sitemap, 22% no meta description.
- Website SEO Statistics: What 5,000 Homepages RevealMore than half of scanned homepages had no structured data at all, per a KinetixSEO sweep of 5,000 Tranco-ranked sites.
Go deeper
Guides by topic
Every in-depth article lives in one of these topic hubs, grouped by the question it answers.
Technical SEO guides
Crawl budget, canonical tags, robots.txt, structured data and Core Web Vitals — the mechanics search engines and AI crawlers depend on, explained plainly.
Browse the guides →GEO and AI search guides
How ChatGPT, Perplexity, Gemini, and AI Overviews actually pick what to cite, and what to change on a page to earn it — evidence-led, no speculation.
Browse the guides →Content SEO guides
Answer-first structure, internal linking, E-E-A-T signals and content depth — the writing and editing decisions that move both rankings and AI citations.
Browse the guides →Local SEO guides
Google Business Profile, local citations, and the on-page signals that decide whether a local business shows up in the map pack and local AI answers.
Browse the guides →SEO basics
Plain-language fundamentals for anyone new to SEO — what actually matters, in the order it matters, without the jargon or the upsell.
Browse the guides →
Diagnose a page
Free SEO & GEO checkers
Start broad, choose a platform-specific audit, or isolate one technical question. Every check works without an account.
Core SEO & GEO checkers
- SEO Audit ToolRun a free SEO audit on any page. Get a ranked SEO Health Score, a GEO Readiness Score for AI search, and no signup required.
- GEO Audit ToolRun a free GEO audit to see whether your page is structured for AI engines to find and cite. Citability, authority, structure, AI-crawler access and media, scored.
- AI Visibility CheckerCheck whether your page is structured to be found and cited by ChatGPT, Gemini, and Perplexity. Free GEO Readiness Score, no signup.
- SEO Fix VerificationFind SEO issues, get a page-specific fix for each one, and verify the fix went live with an included re-scan. Not just a score — a closed loop.
- AI Citation TrackerTrack whether 10 AI engines actually mention your brand. Start with a free GEO Readiness check, then track real citations.
- ChatGPT Visibility CheckerCheck whether your page is built for ChatGPT to find, read and cite. A free, one-off GEO Readiness check, no signup required.
- How to Fix Your SEOHow to fix SEO in six steps, in order: find what is broken, fix crawl and index problems, match the page to the search, verify each fix went live, then measure.
By platform
- WordPress SEO AuditRun a free SEO audit built for how WordPress sites actually break: plugin/theme title conflicts, thin archive pages, orphaned attachment URLs. No plugin install.
- Shopify SEO AuditRun a free SEO audit built for Shopify: duplicate product/collection URLs, app-script bloat, and the platform-locked robots.txt. No app install.
By audience
- SEO for Small BusinessA free SEO audit built for small business owners: findings ranked by impact vs. effort, plain-language explanations, no SEO background required.
- SEO Audits for FreelancersAudit client sites fast: a free, ranked SEO and AI-readiness check per page, with AI-written fixes and a verification re-scan on paid plans.
Specialized checkers
- On-Page SEO CheckerCheck a page's on-page SEO: title tag, meta description, heading hierarchy, image alt text, internal links, and canonical tags. Free, no signup.
- AI Crawler CheckerCheck whether GPTBot, ClaudeBot, PerplexityBot, Google-Extended, bingbot (Copilot), and 50+ other named AI bots can actually reach your page. Free, per-bot robots.txt breakdown.
- AI Crawler Log AnalysisUpload your access log and see which of your sitemap pages GPTBot, ClaudeBot, PerplexityBot and other AI crawlers actually fetched, per crawler, verified against each vendor's IP list or by reverse DNS.
- AI Website Readiness CheckerRun a free, comprehensive AI-readiness check: crawler access, structured data, content structure, and E-E-A-T signals, scored together in one report.
Explore
Browse by need
Quick definitions
SEO & GEO glossary
Plain-English definitions, each connected to deeper context and related guidance.
- AI Hallucination Definition: What It MeansThe AI hallucination definition: a confident, false statement from a language model with no signal it's wrong. See a real example.
- Crawlability vs Indexability: What's the Difference?Crawlability is whether a search bot can access a page at all; indexability is whether that page can be stored and shown in results.
- How to Opt Out of AI Training DataHow to opt out of AI training data: block the right crawler in robots.txt without accidentally cutting off live AI search retrieval too.
- Server-Side Rendering SEO: Quick DefinitionServer-side rendering generates a page's full HTML on the server before sending it to the browser or crawler, unlike a JS-built shell.
- What Is a 302 Redirect? A Quick DefinitionA 302 redirect is a temporary HTTP redirect that sends users and search engines elsewhere without transferring the original URL's ranking signal.
- What Is AI Referral Traffic? A Quick DefinitionAI referral traffic is human visits that arrive on your site after someone clicks a link inside an AI assistant's answer, like ChatGPT or Perplexity.
- What Is a Knowledge Graph? A Quick DefinitionWhat is a knowledge graph? A structured map of entities and relationships that search engines and AI use to verify facts directly.
- What Is a Link Scheme? Definition & ExampleA link scheme is any pattern of link exchange, buying, or automated generation meant to manipulate rankings through artificial link volume.
Browse all 37 definitions ↓Show fewer definitions ↑
- What Is an AI Citation? A Quick DefinitionWhat is an AI citation? It's when an AI answer engine names or links a source in its response — the AI-search version of a search ranking.
- What Is an Answer Engine? Definition and ExamplesAn answer engine is a search or AI system built to give a direct, synthesized answer instead of a list of links to click through.
- What Is an Entity in SEO? A Quick DefinitionWhat is an entity in SEO? A distinct, identifiable thing search engines track independently of keywords — here's how entity recognition works.
- What Is a Nofollow Link? Glossary DefinitionA nofollow link is a hyperlink with the nofollow attribute, once a strict no-ranking-credit rule, now just one signal among many to Google.
- What Is a Search Index? A Quick DefinitionA search index is the enormous, continuously updated database a search engine builds by crawling pages to retrieve results instantly.
- What Is a SERP? Definition & ExampleWhat is a SERP? A clear definition of the search engine results page, plus an example of a modern SERP with an AI Overview.
- What Is a Vector Embedding? A Quick DefinitionWhat is a vector embedding? A numerical map of meaning that lets AI systems judge how similar two pieces of text really are.
- What Is a Web Crawler? Definition, Examples, How It WorksA web crawler, also called a spider or bot, is automated software that a search engine or AI company runs to discover and download pages
- What Is a Zero-Click Search? Quick DefinitionWhat is a zero-click search? It's when Google answers a query on-page via a snippet, panel, or AI Overview, so no site gets the click.
- What Is Black Hat SEO? Glossary DefinitionBlack hat SEO refers to tactics that deliberately violate a search engine's guidelines to manipulate rankings, risking penalties that erase visibility.
- What Is Cloaking in SEO? Glossary DefinitionCloaking in SEO is showing search engine crawlers different content than real visitors see, specifically to manipulate rankings.
- What Is Crawl Budget? A Quick DefinitionWhat is crawl budget? It's the number of pages a search engine will crawl on your site in a given window — here's what shapes and wastes it.
- What Is Domain Rating? Definition & Practical UseWhat is Domain Rating? A vendor-specific 0-100 score estimating link authority — not a Google metric. See how it's defined and actually used.
- What Is Dynamic Rendering SEO? A Quick DefinitionDynamic rendering is a technique of serving pre-rendered HTML to crawlers while users get the normal JavaScript page, detected by user-agent.
- What Is Googlebot? Definition vs. Google-ExtendedWhat is Googlebot? Google's own web crawler for search indexing — distinct from Google-Extended, which governs AI training-data permissions.
- What Is GPTBot? OpenAI's Web Crawler ExplainedWhat is GPTBot? It's OpenAI's crawler for AI training data, separate from ChatGPT's live search bot — and controlled via robots.txt.
- What Is Gray Hat SEO? A Quick DefinitionGray hat SEO refers to tactics that sit in the ambiguous space between clearly compliant white hat SEO and clearly prohibited black hat SEO.
- What Is Grounding in AI? Definition & ExampleWhat is grounding in AI? It's anchoring a model's answer in retrieved real-world data instead of memory alone, cutting hallucination risk.
- What Is Hreflang? A Quick DefinitionHreflang is an HTML attribute that tells search engines which language and regional version of a page to show searchers.
- What Is JavaScript SEO? A Quick DefinitionJavaScript SEO is the practice of ensuring content rendered by JavaScript is still visible, crawlable, and indexable by search engines.
- What Is Keyword Stuffing? Glossary DefinitionWhat is keyword stuffing? It's the outdated practice of overloading a page with repeated keywords, and it's flagged as spam in modern search guidelines.
- What Is Mobile-First Indexing? A Quick DefinitionMobile-first indexing is Google's practice of using a page's mobile version, not desktop, as the primary basis for indexing and ranking.
- What Is Negative SEO? A Quick DefinitionNegative SEO is a malicious attempt to damage a competitor's search rankings, often by building spammy backlinks or scraping their content.
- What Is Page Experience in Google Search?Page experience is Google's umbrella term for signals measuring how good using a page feels beyond its raw content.
- What Is RAG AI? Retrieval-Augmented Generation DefinedRAG AI is an architecture where a system first retrieves relevant documents, then feeds them to a language model as context before it generates a response.
- What Is Structured Data? A Quick DefinitionWhat is structured data? It's standardized markup like JSON-LD that labels page content so search engines and AI can read it precisely.
- What Is Voice Search SEO? A Quick DefinitionVoice search is speaking a query aloud to a device or assistant instead of typing it, producing longer, conversational questions.
- What Is White Hat SEO? A Quick DefinitionWhite hat SEO means practices that fully comply with a search engine's published guidelines while genuinely improving a site for real users.
- WWW vs Non-WWW SEO: Which Should You Use?The www and non-www versions of a site are two different URLs — and hosts — until you pick one as canonical and redirect the other.
Clear answers
Frequently asked questions
Short, self-contained explanations for readers, search engines, and answer engines.
What is the difference between SEO and GEO?
SEO improves visibility in traditional search results such as Google and Bing. GEO helps AI systems such as ChatGPT, Perplexity, Gemini, and AI Overviews understand, trust, and cite your content. Crawlability and clear writing help both (Google says AI Overviews and AI Mode need nothing beyond normal SEO); GEO adds emphasis on direct answers, named entities, evidence, and source attribution.
Where should I start if I am new to SEO?
Start with a free SEO audit if you already have a page to improve. It identifies the highest-impact issues, and the guides here explain why they matter and how to fix them. If you are learning before building, begin with the essential guides and glossary.
Are the checkers on this page really free?
Yes. Every checker linked from this page runs a real, no-signup check. Some products also offer paid monitoring after the free check, but the initial result is complete rather than a teaser.
What is the difference between the glossary and reference guides?
The glossary gives concise definitions for individual terms. Reference guides explore one subject in more depth, with context and examples. Both make technical SEO and AI search understandable without specialist knowledge.
Do I need to fix every issue before my rankings improve?
No. Prioritize findings by likely impact and effort. A perfect score is not the objective; the useful outcome is measurable improvement in what search engines and AI systems can crawl, understand, trust, and cite.
Find out what your page needs next
Run a free audit, then use the guides to understand and fix every finding.