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WebSequenceDiagrams vs UMLet: catalog facts
WebSequenceDiagrams	UMLet
Free Described on its site as a free online tool.	Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.
Web	Windows, macOS, Linux, Web
Diagrams are written as plain text instead of drawn by hand Runs in the browser with nothing to install	Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard
Only draws sequence diagrams Little public detail on export options and paid features	Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools
Web application	Downloadable app, Web application
Closed source	Open source
License not stated	License: GPL-3.0-or-later
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 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.