About AI Crawler Check
The free, instant AI crawler checker and bot analysis tool that shows you exactly how 248 crawlers - from ChatGPT and Gemini to Googlebot and Semrush - interact with your website. Built by Horatos.ai.
What Is AI Crawler Check?
AI Crawler Check (aicrawlercheck.com) is a free online tool purpose-built for SEO professionals, webmasters, and content creators who need to understand how AI bots and search engine crawlers access their website.
In an era where ChatGPT, Claude, Gemini, and Perplexity are rapidly becoming primary traffic sources, your robots.txt configuration determines whether your content appears in AI-generated responses - or remains invisible.
Enter any URL and within seconds, AI Crawler Check fetches your robots.txt, parses it per RFC 9309, checks for llms.txt and llms-full.txt files - then delivers a comprehensive AI Visibility Score from 0 to 100, focused on what matters most: Bot Access (70 pts), AI Infrastructure (15 pts) and Technical Readiness (15 pts).
Why AI Crawler Checking Matters in 2026
The web is undergoing a fundamental shift. AI-powered search (ChatGPT Search, Google AI Overviews, Perplexity, Claude) now generates billions of answers daily by crawling and citing web content in real-time.
If your robots.txt blocks GPTBot, ClaudeBot, or Google-Extended, your pages won't appear in these AI-generated answers - even if you rank #1 on traditional search.
Conversely, blocking aggressive AI training crawlers like Brightbot or CCBot protects your content from being used in LLM training datasets without permission.
The Stakes
- AI Search traffic is growing 400%+ year over year. Missing from AI answers = losing a critical traffic channel.
- 60%+ of websites inadvertently block at least one AI crawler through misconfigured robots.txt.
- Less than 0.3% of websites have adopted llms.txt - the emerging standard for AI discoverability.
- Content protection requires knowing exactly which AI bots are crawling you - and which ones you want to block.
Complete Feature Set
Enter any domain and instantly check how 248 bots across 8 categories interact with your site. Get an AI Visibility Score (0-100) with detailed per-bot analysis. The core AI bot checker that powers everything.
Comprehensive database of 248 bots organized into 8 categories: AI & LLM Bots, Search Engines, Google Bots, SEO Tools, Social Bots, Data Scrapers, Cloud Services, and Other Agents. Each with tier, safety rating, and purpose.
Generate optimized robots.txt files with 248 bot presets, 7 one-click presets (Allow AI Search and Block Training, Block All AI, Allow All, etc.), and per-bot toggle switches. Export ready-to-deploy configuration in seconds. Try the generator →
Paste any robots.txt content and get an instant SEO Safety Score. Detects syntax errors, conflicting rules, missing directives, and provides actionable fix recommendations. Validate yours →
Analyze up to 20 URLs simultaneously. Compare AI Visibility Scores across your portfolio, competitor sites, or client websites. Export results as CSV or copy formatted reports. Check multiple sites →
SEO-optimized directory with 245 bot detail pages, 8 category pages, and 104 operator pages. Each bot page includes user-agent string, safety analysis, blocking instructions (robots.txt, Nginx, Apache, Cloudflare), FAQ schema, and related bots. Browse the directory →
llms.txt Detection
Automatically checks for llms.txt and llms-full.txt - the llmstxt.org standard for AI discoverability. Strict validation prevents false positives from redirects or HTML error pages.
PDF & Excel Export
Export comprehensive AI Crawler Check Reports as PDF (with score gauge, bot breakdown, recommendations) or Excel (with full bot data, score breakdown, sortable sheets). Perfect for client reporting.
AI Visibility Score
Focused scoring system: Bot Access (70 pts) based on Tier 1 AI bot accessibility in robots.txt, AI Infrastructure (15 pts) for llms.txt (10 pts) + llms-full.txt (5 pts) adoption, and Technical Readiness (15 pts) for sitemap (6 pts) + structured data (6 pts) + HTTPS (3 pts). Total: 100 points. No fluff - only what directly impacts your AI visibility.
Who Uses AI Crawler Check? - Real-World Use Cases
1. SEO Agencies & Consultants
Use the Batch URL Checker to audit 20 client websites at once. Export professional PDF reports with each client's AI Visibility Score, blocked bots, and actionable recommendations. The robots.txt generator helps create optimized configurations per client.
"We audit 50+ client sites monthly. AI Crawler Check's batch checker saves us 10+ hours per month, and the PDF reports look professional enough to send directly to clients." - SEO Agency Director
2. Publishers & Content Creators
Check whether GPTBot, ClaudeBot, and Perplexity-User can access your articles. Blocking these bots means your content won't appear in ChatGPT, Claude, or Perplexity answers - losing a massive emerging traffic source. Conversely, identify if aggressive scrapers like Brightbot are consuming your bandwidth.
"We discovered we were accidentally blocking GPTBot through a wildcard rule. After fixing it, our referral traffic from AI search doubled in 3 weeks."
3. E-commerce & SaaS Businesses
Ensure your product pages are accessible to AI shopping assistants (ChatGPT-User, Amzn-User, Google Shopping bots) while protecting private sections (/admin, /api, /checkout). The partial access detection shows exactly which paths are blocked vs. allowed per bot.
"Our product pages were invisible to ChatGPT because our Cloudflare WAF was blocking all AI user-agents. AI Crawler Check's detailed bot-by-bot analysis helped us create targeted allow rules."
4. Educational Institutions & Government
Universities and government agencies need to balance open access to public information with content protection. AI Crawler Check shows which bots access your .edu.vn or .gov domains, and helps create robots.txt rules with the robots.txt generator that allow legitimate search indexing while blocking AI training crawlers.
5. Privacy-Conscious Websites
If your goal is to opt out of AI training, AI Crawler Check identifies every AI bot targeting your site and provides exact blocking rules for each one - via robots.txt, Nginx, Apache, or Cloudflare WAF. The Bot Directory includes verified user-agent strings, safety ratings, and blocking impact analysis.
Inside the AI crawler directory
The AI crawler check is backed by a public crawler directory of 248 bots from 103 operators, with 245 profile pages. 88 of those bots are AI and LLM crawlers. Every profile gives the robots.txt token, the operator, a safety rating, copy-paste rules, and an evidence tier.
| Category | What it covers | Start with |
|---|---|---|
| AI and LLM bots | Training crawlers, AI search indexes, user-triggered assistants | GPTBot, OAI-SearchBot, Claude-SearchBot |
| Search engines | Crawlers that decide classic search visibility | Googlebot, Bingbot, Applebot |
| Google bots | Google's specialised crawlers and control tokens | Google-Extended, GoogleOther |
| SEO tools | Backlink and audit crawlers | SemrushBot, AhrefsBot |
| Social bots | Link preview fetchers | facebookexternalhit |
| Data scrapers | Bulk dataset and scraping crawlers | CCBot, Bytespider |
| Cloud services | Crawlers run by cloud platforms | Amazonbot |
| Other agents | Archivers, monitors and the rest | archive.org_bot |
Prefer to browse by company? The operator index groups tokens by who runs them, for example OpenAI, Anthropic, Google, Meta, Apple, Microsoft and Perplexity AI. Head-to-head pages such as GPTBot vs OAI-SearchBot and ClaudeBot vs Claude-SearchBot settle the most common confusions.
How we grade evidence: Official versus Reported
A bot list is only as good as its sources, so every token carries one of two tiers.
- Official: the operator documents the token on its own domain, for example ClaudeBot (Anthropic crawler documentation) or SemrushBot (Semrush bot documentation). A build step re-checks these pages.
- Reported: the token is seen in logs or third-party lists but the operator has not documented it, for example GrokBot, AzureAI-SearchBot and cohere-ai. We say so on the page.
- Corrections are public. When an operator changes its documentation we update the profile. In 2026 that meant pointing ExaBot to Exa's documented ExaSearchBot, and correcting our Cohere guide after Cohere said it runs no training crawler. The changelog lists each release.
Why this tool exists: the 2025 to 2026 crawler market
AI crawling grew fast and mostly for training. Cloudflare, 29 August 2025 measured training at 79% of AI crawling in July 2025, up from 72% a year earlier. Site owners responded by separating tiers: Hostinger, 20 January 2026 found GPTBot's site coverage fell from 84% to 12% while OpenAI's search crawler reached 55.67%.
Blocking has also moved out of robots.txt. From 15 September 2026, new Cloudflare domains block AI Training and Agent traffic by default on pages that show ads (Cloudflare, 1 July 2026), and Google added a Search Console control for AI Overviews and AI Mode on 31 August 2026 (Google Search Central help). One robots.txt reading is no longer enough, which is why the suite pairs the free AI crawler checker with a live-fetch AI crawler diagnostic.
The free tool suite
- AI crawler checker: tests 248 bots against your robots.txt in one scan.
- AI crawler diagnostic: fetches a page as each AI bot and names the layer that blocks it.
- robots.txt validator: shows allowed, blocked and partial status per bot.
- robots.txt generator: builds a file with presets for search, agents and training.
- batch URL checker: compares up to 20 sites side by side, with CSV export.
- llms.txt generator: writes the file AI assistants read for a site summary.
- schema markup generator: produces JSON-LD for eight common types.
- GEO audit: scores a page for generative engine optimization.
Guides for each step live on the blog, including robots.txt best practices for AI SEO, why AI bots cannot crawl a site and how to monitor AI bot traffic.
Who builds AI Crawler Check
AI Crawler Check is built by Horatos.ai, the AI-native growth marketing agency in Singapore. The same research feeds its AI Search Optimization and Generative Engine Optimization courses and its client GEO and SEO projects, so the directory is maintained because it is used every week on real sites.
How AI Crawler Check Works - Technical Details
Domain Reachability Check
DNS resolution and HTTP probe to confirm the site is live. Invalid domains return clear error messages before analysis begins.
robots.txt Fetch & Parse (RFC 9309)
Downloads and parses robots.txt following the Robots Exclusion Protocol standard. Handles wildcards, path matching, and user-agent specificity rules. Validates content to reject HTML error pages.
AI Infrastructure Files Detection
Checks for llms.txt and llms-full.txt with strict validation: redirect: manual prevents false positives from 301 redirects. Content-type and HTML rejection filters ensure only genuine files are detected.
Bot-by-Bot Analysis
Each of the 248 bots is evaluated against the parsed robots.txt rules. Status is classified as ALLOWED, BLOCKED, or PARTIAL (some paths blocked, others allowed). Versioned bot matching handles user-agents like ChatGPT-User/2.0.
AI Visibility Score Calculation
Focused scoring: Bot Access (70 pts) based on Tier 1 AI bot accessibility in robots.txt, AI Infrastructure (15 pts) for llms.txt (10 pts) + llms-full.txt (5 pts) adoption, and Technical Readiness (15 pts) for sitemap, structured data and HTTPS. Partial access = 75% credit. Total: 100 points.
Built for Speed & Accuracy
AI Crawler Check runs entirely on Cloudflare Workers - a global edge network with 300+ data centers worldwide. This means near-zero latency regardless of where you or the target website are located. The Hono framework powers the backend with minimal overhead, and the bot database is updated regularly to reflect the latest AI crawlers as they emerge.
Frequently Asked Questions
What is AI Crawler Check?
How does the AI crawler checker work?
Is AI Crawler Check free?
What bots does the AI crawler checker detect?
Why should I check my website for AI crawlers?
What is the AI Visibility Score?
Contact Us
AI Crawler Check is developed and maintained by Horatos.ai - an AI Search Optimization (AISEO) and Generative Engine Optimization (GEO) consultancy.
Have questions, feature requests, or need a custom AI visibility audit for your organization? Get in touch.
[email protected]