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Smithereen vs Hubzilla: catalog facts
Smithereen	Hubzilla
Free Free and released into the public domain under the Unlicense.	Free Free open-source software you host yourself.
Self-hosted	Web, Self-hosted
Friends, walls and groups instead of a microblog feed Federates with other ActivityPub servers	Nomadic identity with clones and backups Built-in files, photos, calendar, webpages and wikis
You need to run and maintain your own server Smaller community than Mastodon or other major fediverse servers	Many features make it more complex than simple microblogging servers Requires running your own web server
Self-hosted	Self-hosted
Open source	Open source
License: Unlicense	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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