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Mermaid vs Flowchart Fun: catalog facts
Mermaid	Flowchart Fun
Free Free and open source under the MIT licence.	Free Described on its website as a free online flowchart maker.
Web, Command line	Web
Diagrams are plain text, so they diff and review like code Rendered natively by GitHub, GitLab and most documentation generators	Diagrams are written as plain text, so edits are fast Runs in the browser with nothing to install
Layout is automatic, so fine control over positioning is limited Complex diagrams become hard to read in source form	Less control over exact layout than a freehand drawing tool License and source details are not stated on the homepage
Web application, Downloadable app	Web application
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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