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Heimer vs Project Graph: catalog facts
Heimer	Project Graph
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free download; the project accepts sponsorship.
Windows, Linux	Windows
Supports automatic layouts and image exports.	Many node types including LaTeX, images and SVG Keyboard-driven tree building with automatic layout
It is a diagramming tool rather than a full document editor.	Website and documentation are mainly in Chinese Licence terms are not clearly stated in the research
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	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.