About Headerline Review

Headerline Review is a small editorial site about one practical question: how do you get reliable, machine-readable facts about a website without building a crawler yourself. We write for developers, agencies, SEO and deliverability engineers who audit many domains. We try to be specific about what each check can and cannot tell you, and we mark vendor-published claims as such. Several examples use BusinessMCP’s website checks API because its documentation is public and its behaviour is easy to verify, but we also discuss alternatives and doing it yourself. Nothing here is legal or deliverability guarantees; confirm current details with the vendors and standards bodies.