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Briefkasten vs Servas: catalog facts
Briefkasten	Servas
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0 license.
Web, Self-hosted	Web, Self-hosted
Self-hostable with Docker files included Also offered as a hosted instance	Nested groups and tag-based smart groups Firefox and Chrome extensions
Setup needs a database and an OAuth provider configured No tagged releases	No page archiving Setup requires a few manual Docker steps
Self-hosted, Hosted service	Self-hosted
Open source	Open source
License: MIT	License: GPL-3.0
Account needed	Account 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.