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Emailchemy vs imapsync: catalog facts
Emailchemy	imapsync
Paid Commercial software from Weird Kid Software.	Freemium The source is free software. Prebuilt binaries and support are sold.
Windows, macOS, Linux	Windows, macOS, Linux, Command line
Reads many obsolete email client formats Runs on Windows, Mac and Linux	Restartable and idempotent, so an interrupted migration simply continues Handles the quirks of a long list of specific IMAP server implementations
Paid software Aimed at migration and archiving rather than everyday email	The source is free but official binaries and support are sold Command line only, with a very long option list
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: NLPL
Not stated if an account is needed	Not stated if an account is needed
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 September 22, 2026

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