Yes. The public check requires no account. A connected workspace is needed only for saved evidence, monitoring, and deeper workflows.

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Free HTTP/3 Test

Q: Does Novaverb estimate missing numbers?

No. Missing evidence produces an unavailable or incomplete state instead of an invented metric.

Q: What can I do after this free check?

Connect the target to a Novaverb workspace to save evidence, monitor changes, and run site-wide analysis.

Check whether a website supports HTTP/3 over QUIC with a real handshake — not just the Alt-Svc header. See the confirmed protocol, QUIC version, and advertised h3 endpoints. Free, no account.

verifiedEvidence shown with sourcelock_openNo account requiredblockNo invented metrics

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Run a real check above

Submit a public URL, domain, or keyword. Novaverb will show only the evidence this tool can actually retrieve or measure.

Evidence model

Know what the result proves

Each free check separates measured evidence from interpretation, and interpretation from the deeper work available in a connected workspace.

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1. Source

Live QUIC handshake + Alt-Svc. The result identifies where its evidence came from.

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2. Boundary

This opens a real QUIC connection offering ALPN h3 and also reads the Alt-Svc header. "Confirmed" means a live HTTP/3 handshake completed; "advertised" means the server announced h3 via Alt-Svc.

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3. Next action

Use the finding to verify a problem, then connect a workspace when you need history, monitoring, or site-wide analysis.

HTTP/3, QUIC & how this test works

HTTP/3 is the latest version of the HTTP protocol. Instead of running over TCP, it runs over QUIC — a transport built on UDP that removes head-of-line blocking, combines the transport and TLS 1.3 handshake into fewer round trips, and survives network changes (like Wi-Fi to cellular). The result is lower latency, especially on lossy or high-latency connections.

This test opens a real QUIC connection offering ALPN "h3", performs an HTTP/3 GET, and then reconnects to measure 0-RTT resumption — so every number below comes from a genuine handshake, not just the Alt-Svc advertisement.

What the metrics mean

0-RTT resumption: On a repeat visit the client can send data in the very first packet, with no extra round-trip. "Success" means the server accepted early data.
Packet RX: Time from the first packet sent to the first packet received — a raw round-trip indicator.
Handshake done: Time from the first packet to a completed QUIC + TLS 1.3 handshake.
Connection ID: The QUIC connection identifier that lets a connection survive an IP or network change without reconnecting.

How to enable HTTP/3

Use nginx 1.25+, Caddy, LiteSpeed or a CDN edge that speaks QUIC.
Open UDP port 443 in addition to TCP.
Send Alt-Svc: h3=":443" so browsers upgrade to HTTP/3.

Common questions

HTTP/3 Test FAQ

Is this tool free?

Yes. You can run the public check without creating an account. A connected workspace is required only for saved evidence, monitoring, and deeper product workflows.

Where does the result come from?

Live QUIC handshake + Alt-Svc. This opens a real QUIC connection offering ALPN h3 and also reads the Alt-Svc header. "Confirmed" means a live HTTP/3 handshake completed; "advertised" means the server announced h3 via Alt-Svc.

Does Novaverb estimate missing numbers?

No. If the required evidence is unavailable, the tool returns an unavailable or incomplete state instead of inventing a metric.

What can I do after this free check?

Connect the target to a Novaverb workspace to keep evidence, run site-wide analysis, monitor changes, and move findings into an accountable workflow.

More free checks