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Heimer vs MindMaster: catalog facts
Heimer	MindMaster
Free The open-source software is available without a license fee. Hosting, hardware and…	Freemium Free version available, with a paid professional version adding features.
Windows, Linux	Windows, macOS, Linux, Android, iOS, Web
Supports automatic layouts and image exports.	Runs on desktop, web and mobile with cloud sync Converts maps into task boards and presentations
It is a diagramming tool rather than a full document editor.	This site and edition are in Chinese Advanced features require the paid version
Downloadable app	Downloadable app, Web application
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.