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SequenceDiagram.org vs UMLet: catalog facts
SequenceDiagram.org	UMLet
Free Free to use, supported by optional Patreon donations.	Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.
Web	Windows, macOS, Linux, Web
Text notation and drag and drop editing in one tool Saves to local files, Google Drive, OneDrive or browser storage	Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard
Only draws sequence diagrams No built-in real-time collaboration mentioned	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
No account 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.