HAR-Checker, created by seokeysib, is a Chrome extension that audits third-party network dependencies and regional compliance risks for websites. The tool intercepts network requests in real time and classifies domains by geographic and regulatory status, giving a quick view of blocked or foreign resources that affect page behavior. It reports request types such as JS, CSS, XHR and images, aimed at SEO specialists and web developers who need fast, local audits during testing.

What HAR-Checker actually detects on a page

HAR-Checker concentrates on origin and regulatory status rather than timing metrics. The extension classifies domains into three groups: Russian services, Foreign domains, and resources blocked within the Russian Federation. It parses request types and presents a breakdown for JavaScript, CSS, XHR, FETCH and image requests, so an auditor sees which external hosts supply which assets and where legal or access issues originate.

How it fits into audit workflows and runtime behaviour

Analysis runs inside the browser to avoid external data transfer. HAR-Checker intercepts network requests in real time and performs local processing, which maintains privacy and keeps data off remote servers. That design helps spot blocked resources that can delay page rendering, and it is intended as a quick investigative layer during manual testing rather than a replacement for full waterfall or timing profilers.

Who benefits and how it differs from general HAR tools

The extension targets compliance-focused audits more than general performance debugging. SEO specialists, site owners and developers get domain-origin visibility and regulatory classification instead of raw load-time charts. Compared with general HAR analyzers, HAR-Checker’s niche is domain classification for legal and access checks, and it is available for Chrome and other Chromium-based browsers for use alongside conventional profiling tools.

A focused compliance aid best for targeted audits

HAR-Checker is a practical option for specialists who need quick, on-page visibility into where third-party assets originate and whether access restrictions might affect users. Its narrow scope makes it unsuitable as a standalone performance profiler, so use it together with a timing-focused HAR tool when you need both legal-origin context and detailed load metrics. The extension suits audits aimed at regional compliance and blocked-resource troubleshooting.