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Eonvelope vs MailSteward: catalog facts
Eonvelope	MailSteward
Free Free and open source under the AGPL-3.0 licence.	Paid Lite costs $24.95, MailSteward $49.95 and Pro $99.95, with a trial version available.
Web, Self-hosted	macOS
Supports IMAP, POP, Exchange and JMAP Thread detection and separate storage of attachments and correspondents	Searchable long-term archive for Apple Mail and Gmail Unlimited database size even in the Lite edition
Requires running a Docker stack and accessing it over HTTPS Smaller project with a short track record	macOS only Pro edition requires setting up a MySQL server
Self-hosted	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
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.