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Lucidchart vs Diagram Designer: catalog facts
Lucidchart	Diagram Designer
Freemium Free sign-up tier, with paid plans for more features and teams.	Free Freeware with source code under the MIT licence.
Web	Windows
Covers flowcharts, org charts and technical diagram types Runs in the browser with nothing to install	Small 2 MB installer Template palettes for flowcharts and UML
Requires an account Advanced features sit in paid plans	Windows only Dated interface and simple feature set
Web application	Downloadable app
Closed source	Open source
License not stated	License: MIT
Account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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