Direbase

Most "AI SEO" tools just parse robots.txt. Direbase requests your page with the real crawler user-agents (OAI-SearchBot, PerplexityBot, Claude-SearchBot) to catch WAF blocks you can't see in a browser. It also flags content that only exists after JavaScript runs — Googlebot renders JS, AI crawlers don't. Then it scores direct answers, structured data and E-E-A-T, and generates the fix code. Free, no signup.