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WebSequenceDiagrams vs Swimlanes.io: catalog facts
WebSequenceDiagrams	Swimlanes.io
Free Described on its site as a free online tool.	Free Free to use.
Web	Web
Diagrams are written as plain text instead of drawn by hand Runs in the browser with nothing to install	Live preview while typing Share a diagram just by copying the URL
Only draws sequence diagrams Little public detail on export options and paid features	Only draws sequence diagrams The share URL changes with every edit
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account 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.