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Microsoft Visio vs Diagram Designer: catalog facts
Microsoft Visio	Diagram Designer
Paid Subscription plans or one-time Standard and Professional 2024 licenses, with a free trial.	Free Freeware with source code under the MIT licence.
Windows, Web	Windows
Large library of templates, shapes and stencils Covers flowcharts, org charts, network, UML and BPMN diagrams	Small 2 MB installer Template palettes for flowcharts and UML
Paid, with several confusing plan and license options Desktop version is not available for macOS	Windows only Dated interface and simple feature set
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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