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Himalaya vs aerc: catalog facts
Himalaya	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
Supports several mail protocols and local mailbox formats.	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
Mail authentication and account configuration are required.	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 OR Apache-2.0	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.