SecurityHeaders.com was the go-to tool for checking HTTP security headers. In April 2026, it shut down its public API, leaving pentesters and developers without their primary automated scanning option. This guide covers the best alternatives and why WebAudit.in is the strongest replacement for developers and security professionals. What Was SecurityHeaders.com? SecurityHeaders.com, built by Scott Helme, was a free online scanner that graded websites on the quality of their HTTP security headers. It became a standard reference — consultants used it in client reports, developers checked it before launch, and pentesters cited its grades in findings. The site's real value was its API. For a low monthly fee, you could integrate it into CI/CD pipelines and generate data at scale. That API was shut down in April 2026, making automated workflows that depended on it immediately non-functional. If your scripts or CI pipelines call the SecurityHeaders.com API, they are now silently failing. You need a replacement.…