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

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