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mblaze vs mu: catalog facts
mblaze	mu
Free Free, with the source code published on GitHub.	Free Free to download, with source code on GitHub.
macOS, Linux, Command line	Linux, Command line
Small composable commands that work in shell pipelines Works directly on standard Maildir folders	Fast indexing and detailed search of Maildir mail mu4e gives a full email client inside Emacs
No graphical or full-screen interface Needs a separate program to fetch and send mail	Works only with Maildir storage; mail must be fetched separately The client side requires Emacs
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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