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Astah Professional vs UMLet: catalog facts
Astah Professional	UMLet
Paid Commercial license with a free trial and student options.	Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.
macOS	Windows, macOS, Linux, Web
UML, ERD, DFD and flowcharts in one tool API and free plugins for customisation	Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard
Paid license after the trial Focused on software modelling rather than general diagramming	Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools
Downloadable app	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.