Can ChatGPT and Claude actually read your site?
Check llms.txt, JSON-LD and AI crawler access in one minute. A free LLMO (LLM Optimization) audit tool built for solo developers in the AI search era.
llms.txt Detection
Auto-detect /llms.txt or /llms-full.txt (llmstxt.org proposed standard). Get a Markdown template if missing.
JSON-LD Structured Data
Check for schema.org JSON-LD scripts so LLMs can accurately understand your page content.
AI Crawler Access
Verify GPTBot, ClaudeBot, PerplexityBot, Google-Extended and other AI crawlers are not blocked in robots.txt.
Semantic HTML
Ensure your page structure uses meaningful tags like <article>, <main>, <section>, <nav>, <header>, <footer>.
Image Alt Coverage
Alt attributes help LLMs understand images — 80%+ coverage is the target for a passing grade.
Content Extractability
AI crawlers don't execute JS. Your HTML needs enough static body text — SSR/SSG compatibility check included.
Check your LLMO compliance now
Just enter a URL. No signup, instant results.
* Free up to 3-5 audits/min, 30-50/day
→ Add /llms.txt with an LLM-friendly site summary
→ Add alt="description" to every <img> tag
Frequently Asked Questions
Q. What is LLMO?
A. LLMO (Large Language Model Optimization) is the practice of structuring your site so AI search engines and LLMs (ChatGPT, Claude, Perplexity, Google AI Overviews, etc.) can accurately understand and cite your content. Unlike traditional SEO targeting search crawlers, LLMO focuses on making content easy for AI agents to summarize and reference.
Q. What is llms.txt?
A. llms.txt is a proposed standard from llmstxt.org — a Markdown file at /llms.txt or /llms-full.txt describing your site and linking to key content for LLMs. Think of it as robots.txt but for AI assistants, helping them efficiently understand your site.
Q. Should I block AI crawlers?
A. It depends on your goal. If you want LLMs to cite/summarize your site and drive traffic, allow them (default). If you don't want your content used as training data, block them. DevForge only reports the current state — it doesn't recommend one way or the other.
Q. How long does the audit take?
A. Typically 5-15 seconds depending on your site's response speed. Results are saved per project and can be re-checked anytime.
Explore other strengths
Free to sign up. No credit card needed.
DevForge audits 26 items (including LLMO) per project on a schedule.
Try it free now