Current licensing for (released July 2025) follows a perpetual, device-based model : StarUML V7 Standard: $129 per device (one-time payment).
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You will see a "Unregistered" watermark on exported diagrams and occasional pop-up reminders asking you to purchase a license. Current licensing for (released July 2025) follows a
A powerful UML Modeller part of the KDE desktop environment. To help find the right path forward, let
: There is no time limit on the evaluation, but a watermark is added to exported diagrams, and periodic "buy now" reminders will appear. Personal License : Usually costs around for a lifetime license of a major version. Official Site StarUML.io 2. Top Free & Open Source Alternatives