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getmail6 vs OfflineIMAP: catalog facts
getmail6	OfflineIMAP
Free Free and open source.	Free Free and open source under the GPL.
macOS, Linux, Command line	macOS, Linux, Command line
Supports POP3, IMAP and their SSL variants Delivers to maildir, mbox or an external MDA	Two-way sync into plain Maildir, which any local mail client can read Per-folder rules and filters for what gets mirrored
Command line and config files only Retrieves mail but does not send or display it	Python performance is poor on very large mailboxes Configuration is a hand-written file with many options
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.