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UMLet vs SequenceDiagram.org: catalog facts
UMLet	SequenceDiagram.org
Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.	Free Free to use, supported by optional Patreon donations.
Windows, macOS, Linux, Web	Web
Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard	Text notation and drag and drop editing in one tool Saves to local files, Google Drive, OneDrive or browser storage
Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools	Only draws sequence diagrams No built-in real-time collaboration mentioned
Downloadable app, Web application	Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	No 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 October 2, 2026

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