Compare software

Diagram DesignerOmniGraffle
Free

Freeware with source code under the MIT licence.

 Paid

Paid app with a free 14-day trial.

Windows macOS, iOS
  • Small 2 MB installer
  • Template palettes for flowcharts and UML
  • Covers diagramming, rapid prototyping and vector design in one app
  • Precise snapping, grouping and alignment tools
  • Windows only
  • Dated interface and simple feature set
  • Apple platforms only
  • Paid after the 14-day trial
Downloadable app Downloadable app
Open source Closed source
License: MIT License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked October 2, 2026

Checked October 1, 2026

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