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Diagram Designer vs Microsoft Visio: catalog facts
Diagram Designer	Microsoft Visio
Free Freeware with source code under the MIT licence.	Paid Subscription plans or one-time Standard and Professional 2024 licenses, with a free trial.
Windows	Windows, Web
Small 2 MB installer Template palettes for flowcharts and UML	Large library of templates, shapes and stencils Covers flowcharts, org charts, network, UML and BPMN diagrams
Windows only Dated interface and simple feature set	Paid, with several confusing plan and license options Desktop version is not available for macOS
Downloadable app	Downloadable app, Web application
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
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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