Measure your site from inside China
Every tool here runs from probe servers inside mainland China. A test run from anywhere else is measuring a network path your visitors in China do not take.
China Firewall Test
Is this URL reachable from inside mainland China — and which of its third-party dependencies are not?
Requests issued by probe servers inside the mainland. Per-resource results, not just a page-level pass or fail.
Run itChina Website Speed Test
A standard Lighthouse audit, executed from inside China instead of from somewhere that can still reach your origin.
Google PageSpeed Insights audits from infrastructure that cannot reach the mainland, so its score describes a path no Chinese visitor takes.
Run itWhat these tools do not tell you
Both tools answer a technical question: can a request from inside China complete, and how long does it take. Neither answers the regulatory one, and the two get confused constantly.
A site can be perfectly reachable and still have no legal basis to be served from inside mainland China. Anything actually delivered from the mainland requires an ICP filing — triggered by server location, requiring a mainland legal entity, and bound to the access provider rather than only to the domain.
The two questions meet at one point. Removing the cross-border round trip means serving from inside the mainland, and that is the event that triggers the filing. A Hong Kong or Singapore node is exempt for exactly the reason it cannot close the gap — it never enters China. So the arrangement that avoids the filing has, by construction, kept the latency. The full comparison is here.
