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aerc vs nmail: catalog facts
aerc	nmail
Free Free and open source under the MIT licence.	Free Free and open source under the MIT and GPL-2.0 licenses.
macOS, Linux, Command line	macOS, Linux, Command line
Composes in an embedded terminal, so you can read other mail while replying Built for the git mailing-list patch workflow, with diff highlighting and repo tabs	IMAP and SMTP support Searches local cache and server messages
Terminal only, with vim-style keybindings to learn HTML mail rendering is a terminal browser, so complex newsletters look poor	Does not support multiple email accounts in a single session. Does not provide a threaded view.
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT, GPL-2.0
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 8, 2026

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