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Free UML Tools for Development: What Are Your Options?

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Unified Modeling Language (UML) is a standardized modeling language that provides a way for visualizing a system’s architectural blueprints. It includes a set of graphic notation techniques to create visual models of software systems. In this article, we will explore some of the best free UML tools available for developers.

Quick Answer

There are several free UML tools available for development, including Umbrello, ArgoUML, Dia, Umlet, Papyrus, Cacoo, yEd, Gaphor, Visual Paradigm (community edition), Astah* (UML Editor version for students), and Each tool has its own unique features and limitations, so it’s important to choose the one that best fits your requirements.


Umbrello is a UML modeling tool based on the KDE technology stack. It provides a rich set of diagrams including class, sequence, state, use case, entity-relationship, and more. It also supports code generation in various programming languages such as C++, Java, PHP, and Python. Umbrello is a great option if you’re looking for a non-Java UML tool.


ArgoUML is a UML tool written in Java. It supports all standard UML 1.4 diagrams and provides features like click and drag, zoom, clipboard, adjustable font size, and more. However, ArgoUML’s sequence diagrams are not fully developed, which is a limitation to consider.


Dia is a versatile diagramming tool that can be used for creating UML diagrams. While it does not offer automatic code generation, Dia’s strength lies in its simplicity and ease of use. It also supports a plugin called dia2code that can generate code from Dia diagrams.


Umlet is a free, open-source UML tool with a simple user interface. It allows you to draw UML diagrams quickly, supports exporting diagrams to various formats, and can be run as a standalone tool or as an Eclipse plugin.


Papyrus is an advanced open-source UML tool that supports UML2 and other modeling languages such as SysML and MARTE. It is available as a plugin for Eclipse and is known for its support of Model-Driven Development (MDD) and the Model-Driven Architecture (MDA) pattern.


Cacoo is a web-based UML tool that allows you to create UML diagrams and various other types of diagrams. It offers collaboration features and concurrent editing, making it suitable for team projects.


yEd is a freeware, cross-platform UML tool that supports various types of diagrams, including UML. While it is not open-source, it is widely used and offers a range of features.


Gaphor is a UML editor that is relatively easy to use and has fewer limitations compared to other UML editors. However, it does not support code generation.

Visual Paradigm

Visual Paradigm is a powerful commercial UML tool, but it also offers a free community edition for non-commercial use. The community edition has some restrictions, such as closing the program every hour.


Astah* is a highly regarded UML tool with a user-friendly drawing experience. While the free community version is no longer available, they offer a free UML Editor version for students. is a free online UML tool that can be used for creating UML diagrams. It supports collaborative editing and is suitable for team projects.

Each of these UML tools has its own unique features and limitations. It’s important to choose the one that best fits your requirements. Whether you’re a student, a hobbyist, or a professional developer, there’s a UML tool out there that can help you visualize and design your software systems more effectively.

Can I use these free UML tools for commercial projects?

Yes, most of these free UML tools can be used for commercial projects. However, it’s important to check the specific licensing terms of each tool to ensure compliance.

Can I import existing code into these UML tools?

Some UML tools, such as Umbrello and ArgoUML, support importing existing code. However, the level of support may vary, so it’s best to check the documentation or features of each tool for more information.

Can I export UML diagrams created with these tools to other formats?

Yes, most of these UML tools support exporting diagrams to various formats such as PNG, SVG, PDF, or even code. The specific export formats available may vary depending on the tool.

Are these UML tools suitable for beginners?

Yes, many of these UML tools are designed to be user-friendly and suitable for beginners. Tools like Dia and Umlet have simple interfaces and are easy to use, making them a good choice for beginners.

Do these UML tools support collaboration and team projects?

Yes, some of these UML tools, such as Cacoo and, offer collaboration features that allow multiple users to work on the same diagrams simultaneously. These tools are suitable for team projects and remote collaboration.

Can I generate code from UML diagrams using these tools?

Yes, some of these UML tools, like Umbrello and Dia with the dia2code plugin, support code generation from UML diagrams. However, the level of code generation support may vary, so it’s recommended to check the documentation or features of each tool for more details.

Are there any limitations to the free versions of these UML tools?

Yes, the free versions of these UML tools may have limitations compared to their paid or commercial counterparts. For example, Visual Paradigm’s community edition has restrictions on usage time, and some tools may have limited features or lack certain advanced functionalities.

Can I use these UML tools on different operating systems?

Yes, many of these UML tools are cross-platform and can be used on different operating systems like Windows, macOS, and Linux. However, it’s always recommended to check the system requirements of each tool to ensure compatibility.

Is there any technical support available for these free UML tools?

The level of technical support may vary for each tool. Some tools, like Visual Paradigm’s community edition, may offer limited support for free users, while others may rely on user forums or community-driven support. Checking the documentation or support resources for each tool can provide more information on the available support options.

Can I use these UML tools offline?

Yes, most of these UML tools can be used offline. They are standalone applications or plugins that can be installed on your local machine. However, some web-based tools like Cacoo and may require an internet connection for certain features or collaboration.

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