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Mail Backup X vs Bichon: catalog facts
Mail Backup X	Bichon
Paid Free to try, with a paid licence to keep using it.	Free Free and open source under the AGPL-3.0 licence.
Windows, macOS	Web, Self-hosted
Supports many desktop clients and online mail services Archive viewer and format converter included	No external database required Unified full-text search across accounts
Proprietary and paid after the trial Developer details are not clear from the site	Only archives mail; it cannot send or reply IMAP is the main source for downloading mail
Downloadable app	Downloadable app, Self-hosted
Closed source	Open source
License not stated	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 September 24, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.