Signal Check reads one public page you enter, plus its robots.txt and llms.txt, and returns a pass-or-fix checklist covering title, meta, canonical, structured data, sitemap presence and whether seven named AI crawlers are blocked. It is a technical checklist, not a ranking or citation prediction.
The scan is free with no signup. A $19 a month plan adds saved history, change comparison and report downloads, and paid access is set up by hand.
AI assistants are becoming a discovery channel but sites unknowingly block or confuse their crawlers; Signal Check makes the technical state visible in one scan.