Violet UML Editor vs Visual Paradigm

Violet UML Editor is a free, open-source application for drawing simple UML diagrams quickly. It supports class, activity, object, sequence, state and use case diagrams. The project describes Violet as easy to learn and use, and intended for developers, students, teachers and authors who need straightforward UML diagrams. Violet is licensed under GNU General Public License version 2.0 (GPLv2) and is written in Java, with Java Swing and Java SWT listed as interfaces. Linux, Mac and Windows are named operating systems, while the platform listing also includes web. The source repository directs users to SourceForge for downloads. Building from source requires Java Development Kit 17 or greater and Maven 3 or greater; the repository specifies running `mvn clean package` from the root directory to compile and package the project. The maintainer invites contributors to submit pull requests and says requests will be examined before contacting contributors. Violet has one listed plan: free, described as a completely free, cross-platform UML editor. Deployment is listed as both, with web, Windows and Linux among supported platforms.

Visual Paradigm is a visual modeling and development platform covering diagramming, code engineering, agile management, and enterprise architecture. It supports UML, SysML, flowcharts, organization charts, ER, BPMN, data-flow, EPC, mind maps, C4, Gantt, wireframes, and cloud architecture diagrams. AI can generate class diagrams, flowcharts, and user stories from descriptions, while the Unified Platform provides access to more than 100 specialized apps. Users can work across the desktop application and external web browsers, with project synchronization between them. Visual Paradigm Cloud supports concurrent design, review, and commenting. Listed online collaboration limits are three participants for Free, five for Starter, and unlimited for higher plans. Integrations include Jira, Confluence, Eclipse, NetBeans, IntelliJ IDEA, Visual Studio, and Android Studio. The Free plan is strictly for non-commercial use and includes more than 40 AI-powered apps and basic diagramming. Starter costs $4 a month billed annually; desktop subscriptions start with Modeler at $6 a month billed monthly. A 30-day trial is available.