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aerc vs S-nail: catalog facts
aerc	S-nail
Free Free and open source under the MIT licence.	Free Free software distributed under multiple BSD, ISC, HPND, and RSA-MD licenses.
macOS, Linux, Command line	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	Supports MIME email Provides command-line email sending and reading
Terminal only, with vim-style keybindings to learn HTML mail rendering is a terminal browser, so complex newsletters look poor	Requires a Unix-like environment
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: BSD-2-Clause AND BSD-3-Clause AND BSD-4-Clause AND ISC AND HPND-sell-variant AND RSA-MD
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.