Compare software

OfflineIMAPfdm
Free

Free and open source under the GPL.

 Free

Free, with the source code published on GitHub.

macOS, Linux, Command line macOS, Linux, Command line
  • Two-way sync into plain Maildir, which any local mail client can read
  • Per-folder rules and filters for what gets mirrored
  • Combines fetching and filtering in one program
  • Delivers to Maildir, mbox, IMAP, LMTP or a pipe
  • Python performance is poor on very large mailboxes
  • Configuration is a hand-written file with many options
  • No interface for reading mail
  • Configuration takes time to learn
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0 License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 1, 2026

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