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aerc vs nmh: catalog facts
aerc	nmh
Free Free and open source under the MIT licence.	Free Free software under the BSD-3-Clause license.
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	Uses small, single-purpose mail programs Commands can be combined in shell scripts
Terminal only, with vim-style keybindings to learn HTML mail rendering is a terminal browser, so complex newsletters look poor	Gmail API access is experimental Gmail OAuth2 support for desktop applications has been dropped
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: BSD-3-Clause
No account needed	Not stated if an account is needed
Works offline	Not stated if it 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.