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Bichon vs Open Archiver: catalog facts
Bichon	Open Archiver
Free Free and open source under the AGPL-3.0 licence.	Freemium Free to self-host; a paid Enterprise Edition adds extra features.
Web, Self-hosted	Web, Self-hosted
No external database required Unified full-text search across accounts	Imports from Google Workspace, Microsoft 365, IMAP, PST and mbox Searches inside attachments as well as message text
Only archives mail; it cannot send or reply IMAP is the main source for downloading mail	Some features are reserved for the paid Enterprise Edition Aimed at organisations, so heavier than personal archivers
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: AGPL-3.0	License: AGPL-3.0
Not stated if an account is needed	Not stated if an account is 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.