# WebTransport Day: public WebTransport echo server status and alternatives

> WebTransport Day is an independent resource for web developers building realtime apps: WebTransport and the web platform, plus hands-on coverage of the AI coding tools developers use to build them. It is not affiliated with the public echo server that previously ran on this domain.

URL: https://webtransport.day/

**Short answer:** A WebTransport echo server is a test server that sends back whatever a WebTransport client sends it, over HTTP/3 and QUIC. The public one that used to run on webtransport.day is no longer running here. Use the browser tester to test any server, or pick another public echo server.

**Notice:** This domain previously hosted a public WebTransport echo server. That service is no longer running here. This site is now an independent developer resource and is not affiliated with the original service.

## Where to go

- [WebTransport tester](https://webtransport.day/tools/webtransport-tester/): connect from your browser to any WebTransport URL.
- [Public echo servers](https://webtransport.day/echo-server/): history and checked alternatives.
- [Guides](https://webtransport.day/guides/) and the [learning path](https://webtransport.day/learn/webtransport/).
- [Glossary](https://webtransport.day/glossary/), [cheat sheet](https://webtransport.day/cheatsheet/) and [datasets](https://webtransport.day/data/).