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