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Cone vs meli: catalog facts
Cone	meli
Free Free open-source software.	Free Free and open source under the GPLv3.
Linux, Command line	macOS, Linux, Command line
Multiple IMAP and POP3 accounts plus local maildirs Built-in editor with spell checking	Supports IMAP, Maildir, notmuch, JMAP and mbox Plain text configuration with sane defaults
Text-only interface Images and PDFs need external viewer programs	Described by its developers as experimental Non-UTF-8 encodings are read-only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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