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SequenceDiagram.org vs WebSequenceDiagrams: catalog facts
SequenceDiagram.org	WebSequenceDiagrams
Free Free to use, supported by optional Patreon donations.	Free Described on its site as a free online tool.
Web	Web
Text notation and drag and drop editing in one tool Saves to local files, Google Drive, OneDrive or browser storage	Diagrams are written as plain text instead of drawn by hand Runs in the browser with nothing to install
Only draws sequence diagrams No built-in real-time collaboration mentioned	Only draws sequence diagrams Little public detail on export options and paid features
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it 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 October 2, 2026

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