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getmail6 vs isync: catalog facts
getmail6	isync
Free Free and open source.	Free Free and open source under the GPL.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Supports POP3, IMAP and their SSL variants Delivers to maildir, mbox or an external MDA	Much faster than Python-based synchronisers on large mailboxes Precise control over which folders sync and in which direction
Command line and config files only Retrieves mail but does not send or display it	Configuration syntax is terse and mistakes can delete mail Command line only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0
No account 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 September 22, 2026

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