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imapsync vs Emailchemy: catalog facts
imapsync	Emailchemy
Freemium The source is free software. Prebuilt binaries and support are sold.	Paid Commercial software from Weird Kid Software.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Restartable and idempotent, so an interrupted migration simply continues Handles the quirks of a long list of specific IMAP server implementations	Reads many obsolete email client formats Runs on Windows, Mac and Linux
The source is free but official binaries and support are sold Command line only, with a very long option list	Paid software Aimed at migration and archiving rather than everyday email
Downloadable app	Downloadable app
Open source	Closed source
License: NLPL	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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