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SimpleDiagrams vs Diagram Designer: catalog facts
SimpleDiagrams	Diagram Designer
Paid The website offers a seven-day trial; the Mac App Store edition is paid up front.	Free Freeware with source code under the MIT licence.
macOS	Windows
Hand-drawn shape libraries cover several domains Native Mac desktop interface	Small 2 MB installer Template palettes for flowcharts and UML
Desktop app is available for Mac	Windows only Dated interface and simple feature set
Downloadable app	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 October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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