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UMLet vs WebSequenceDiagrams: catalog facts
UMLet	WebSequenceDiagrams
Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.	Free Described on its site as a free online tool.
Windows, macOS, Linux, Web	Web
Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard	Diagrams are written as plain text instead of drawn by hand Runs in the browser with nothing to install
Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools	Only draws sequence diagrams Little public detail on export options and paid features
Downloadable app, Web application	Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is 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 October 2, 2026

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