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