New. Onion Domain. Get a custom .onion address for your Tor hidden service.
Check if a website supports HTTP/2 and HTTP/3. Modern protocols mean faster, more secure connections.
The check runs in real time against the live server.
Paste any publicly accessible website URL. No signup, no setup.
We perform a real protocol negotiation with the target server, not just a header check.
Clear pass/fail indicators for HTTP/1.1, HTTP/2, and HTTP/3 in under a second.
Performance improvements that make a real difference on real networks.
Revolutionized web performance with multiplexing, header compression, and server push. Widely supported and a meaningful speed improvement over HTTP/1.1.
Built on QUIC instead of TCP. Eliminates head-of-line blocking, cuts connection setup time, and performs better on mobile and unreliable networks.
Data from last 7 days.
Apr 28, 2026
Legacy protocol still in use
Most widely adopted modern protocol
Next-generation protocol, rapidly growing