Compare software

Mermaid vs Gaphor: catalog facts
Mermaid	Gaphor
Free Free and open source under the MIT licence.	Free The software is free under its open-source licence. Hosting, hardware and external…
Web, Command line	Windows, macOS, Linux
Diagrams are plain text, so they diff and review like code Rendered natively by GitHub, GitLab and most documentation generators	It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…
Layout is automatic, so fine control over positioning is limited Complex diagrams become hard to read in source form	It is a modelling tool rather than a quick diagram editor, and it does not generate code from…
Web application, Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0
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 September 22, 2026

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