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Hongdown vs rumdl: catalog facts
Hongdown	rumdl
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the MIT licence.
Windows, Command line	Command line
Consistent, documented Markdown style applied automatically Per-project configuration file	Both lints and formats Markdown Written in Rust for speed
Enforces one author's conventions, which may not match your preferences Command-line only, with no editor interface of its own	Command-line only Younger project than established Markdown linters
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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