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Zen Flowchartdraw.io
Freemium

Free to start, with an optional paid upgrade.

 Free

Free and open source under Apache 2.0. The project states you can use it for any purpose…

Web Windows, macOS, Linux
  • Very simple interface with one-click node creation
  • Real-time collaboration with view, comment and edit roles
  • Works entirely offline with files stored locally, so nothing is uploaded
  • Large shape libraries including AWS, Azure, Cisco and Kubernetes icon sets
  • Deliberately limited feature set compared with full diagram suites
  • Works online only
  • Electron, so it is heavy for a diagram editor
  • No real-time collaboration in the desktop build
Web application Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked October 2, 2026

Checked September 21, 2026

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