Compare software

Ech0 vs Known: catalog facts
Ech0	Known
Free Free and open source under the AGPL-3.0 licence.	Free Free and open source software.
Self-hosted	Self-hosted
Lightweight and quick to deploy Full ownership of your posts on your own domain	IndieWeb support with replies and bookmarks between sites ActivityPub delivery to the Fediverse
Some documentation is only in Chinese Not a note-taking or team documentation tool	Needs PHP 8.3+, a database and a background worker for ActivityPub Install packages are unofficial; main code is under active development
Self-hosted	Self-hosted
Open source	Open source
License: AGPL-3.0	License: Apache-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.