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Pop vs aerc: catalog facts
Pop	aerc
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Command line	macOS, Linux, Command line
Offers interactive composition and a scriptable command-line mode.	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
Requires SMTP credentials or a supported sending-service account.	Terminal only, with vim-style keybindings to learn HTML mail rendering is a terminal browser, so complex newsletters look poor
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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