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Espial vs Briefkasten: catalog facts
Espial	Briefkasten
Free Free and open source under the AGPL-3.0 licence.	Free Free and open source under the MIT licence.
Web, Self-hosted	Web, Self-hosted
Multi-user support Simple SQLite storage	Self-hostable with Docker files included Also offered as a hosted instance
Requires running your own server Small project with a modest feature set	Setup needs a database and an OAuth provider configured No tagged releases
Self-hosted	Self-hosted, Hosted service
Open source	Open source
License: AGPL-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.