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draw.io vs Zen Flowchart: catalog facts
draw.io	Zen Flowchart
Free Free and open source under Apache 2.0. The project states you can use it for any purpose…	Freemium Free to start, with an optional paid upgrade.
Windows, macOS, Linux	Web
Works entirely offline with files stored locally, so nothing is uploaded Large shape libraries including AWS, Azure, Cisco and Kubernetes icon sets	Very simple interface with one-click node creation Real-time collaboration with view, comment and edit roles
Electron, so it is heavy for a diagram editor No real-time collaboration in the desktop build	Deliberately limited feature set compared with full diagram suites Works online only
Downloadable app	Web application
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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