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Himalaya vs mu: catalog facts
Himalaya	mu
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free to download, with source code on GitHub.
Windows, macOS, Linux, Command line	Linux, Command line
Supports several mail protocols and local mailbox formats.	Fast indexing and detailed search of Maildir mail mu4e gives a full email client inside Emacs
Mail authentication and account configuration are required.	Works only with Maildir storage; mail must be fetched separately The client side requires Emacs
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Apache-2.0	License not stated
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 23, 2026

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