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Heimer vs VYM: catalog facts
Heimer	VYM
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the GPL.
Windows, Linux	Windows, macOS, Linux
Supports automatic layouts and image exports.	Exports to HTML, PDF and office formats for sharing outside the app Scriptable for repetitive map manipulation
It is a diagramming tool rather than a full document editor.	The interface is functional rather than modern Releases are occasional
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-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.