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UMLet vs Astah UML: catalog facts
UMLet	Astah UML
Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.	Paid Paid license with a free trial and student options.
Windows, macOS, Linux, Web	macOS
Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard	Focused on UML without extra complexity Mind mapping included
Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools	Paid after the trial SysML and other modeling require separate editions
Downloadable app, Web application	Downloadable app
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.