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rumdl vs Hongdown: catalog facts
rumdl	Hongdown
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0-or-later licence.
Command line	Windows, Command line
Both lints and formats Markdown Written in Rust for speed	Consistent, documented Markdown style applied automatically Per-project configuration file
Command-line only Younger project than established Markdown linters	Enforces one author's conventions, which may not match your preferences Command-line only, with no editor interface of its own
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
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 October 2, 2026

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