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Briefkasten vs Anchr: catalog facts
Briefkasten	Anchr
Free Free and open source under the MIT licence.	Free Free and open source; the hosted service at anchr.io is free to sign up for.
Web, Self-hosted	Android, Web, Self-hosted, Browser extension
Self-hostable with Docker files included Also offered as a hosted instance	Bookmarks, short links and image hosting in one tool Client-side password encryption for uploaded images
Setup needs a database and an OAuth provider configured No tagged releases	Bookmark features are basic compared with dedicated link archivers Link checking depends on Google's Safe Browsing API
Self-hosted, Hosted service	Downloadable app, Web application, Self-hosted, Hosted service, Browser extension
Open source	Open source
License: MIT	License: GPL-3.0
Account needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
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.