HTTP/3 vs WebSocket

HTTP/3 is the more common of the two in our index: it runs on 18,231 websites against 10 for WebSocket, and 2 sites use both. Counts come from real scans, not vendor claims.

HTTP/3: 18,231
WebSocket: 10

HTTP/3

HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.

Indexed sites: 18,231
Share of Miscellaneous: 41%

Well-known sites using it

All 18,231 sites

WebSocket

WebSocket is a communication protocol that provides full-duplex communication channels over a single, long-lived connection, enabling interactive communication between web browsers and servers.

Indexed sites: 10
Share of Miscellaneous: 0%

Well-known sites using it

All 10 sites

Used together

2 sites run both HTTP/3 and WebSocket. That is 20% of the sites using WebSocket, the smaller of the two.

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Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.