10 tools compared
Best NClass Alternatives in 2026
NClass (NClass is a free tool to easily create UML class diagrams with full C# and Java language support) isn't the right fit for everyone. Below are 10 real alternatives pulled straight from our NClass profile.
| # | Tool | Pricing | Platforms |
|---|---|---|---|
| 1 | LucidChart | — | — |
| 2 | Dia | — | — |
| 3 | OmniGraffle | — | |
| 4 | PlantUML | Open source | |
| 5 | yEd | — | |
| 6 | draw.io | Open source | |
| 7 | StarUML | — | |
| 8 | UMLet | — | |
| 9 | CollabNet | — | — |
| 10 | UMLGraph | — |
1. LucidChart
LucidChart is built for users looking to create, collaborate on, and publish flowcharts and diagrams directly from a web browser. It stands out with a user-friendly interface, cross-platform web browser access, and robust collaboration tools that include real-time editing and commenting.
Full LucidChart profile →2. Dia
Dia is a GTK+ based diagram creation program suited for users who need a free and open-source tool released under the GPL license. It provides support for a wide range of diagram types such as flowcharts, network diagrams, and UML diagrams. Users can also utilize a customizable toolset to create custom shapes and objects for specific projects, backed by extensive documentation and an active user community.
Full Dia profile →3. OmniGraffle
OmniGraffle is built for creating precise graphics like website wireframes, electrical system designs, and software class maps. It stands out with a user-friendly interface that offers a minimal learning curve, alongside advanced diagram tools such as customizable templates, Bézier lines, and powerful styling options. Users also benefit from cross-platform support on macOS and iOS, integration capabilities that include exporting to different formats and APIs for automation, and frequent updates from The Omni Group.
Full OmniGraffle profile →4. PlantUML
PlantUML is an open-source tool well-suited for technical and non-technical users who want to create UML and non-UML diagrams using a plain text language. Because diagrams are stored as text files, it stands out for being version control friendly with systems like Git. Its straightforward text-based syntax allows for quick diagram creation and modification without needing a graphical interface, and it supports a wide range of diagrams including sequence, use case, and class diagrams.
Full PlantUML profile →5. yEd
yEd is a free desktop application well-suited for individuals and organizations working within budget constraints who need to create, import, edit, and automatically arrange diagrams. It stands out with a user-friendly interface that minimizes the learning curve, alongside powerful automatic layout algorithms designed to quickly organize complex structures into clear diagrams. The software supports versatile diagram types such as flowcharts, UML diagrams, and network diagrams to accommodate a wide variety of documentation needs.
Full yEd profile →6. draw.io
draw.io is an online diagramming application built for users who need to create flowcharts, UML diagrams, and network diagrams directly in a web browser without requiring any installation. The platform features an intuitive drag-and-drop interface, customizability for shapes, styles, and templates, and real-time collaboration capabilities that allow multiple users to work on the same diagram simultaneously. It integrates directly with cloud storage services such as Google Drive, OneDrive, and Dropbox.
Full draw.io profile →7. StarUML
StarUML is a diagramming tool suited for both beginners and seasoned professionals who need to create UML diagrams, ERDs, DFDs, and flowcharts. It stands out with a clean, intuitive User-Friendly Interface, Cross-Platform Support for Windows, macOS, and Linux, and an Extension Manager for custom plugins. Users can export diagrams in PDF, PNG, and HTML formats and rely on comprehensive documentation and tutorials.
Full StarUML profile →8. UMLet
UMLet is a good fit for beginners and developers looking for a simple, intuitive, and open-source tool for quick UML diagramming. Its lightweight application design ensures smooth performance without consuming significant system resources, even on less powerful machines. It offers immediate visual feedback and provides both a standalone version and an Eclipse plugin to integrate well with various development environments.
Full UMLet profile →9. CollabNet
CollabNet is genuinely good for small teams and large enterprises looking for a comprehensive Application Lifecycle Management (ALM) suite. It stands out with its ability to manage a large number of repositories, users, and projects efficiently, while offering strong integration capabilities with third-party tools like Jenkins and JIRA. Teams also benefit from support for multiple version control systems including Git and Subversion (SVN), alongside robust security features like access control, data encryption, and industry standard compliance.
Full CollabNet profile →10. UMLGraph
UMLGraph is a professional automated drawing tool well-suited for developers who want to generate UML class and sequence diagrams directly from Java source code. By utilizing text-based configuration through textual annotations in the source code, it allows teams to maintain diagrams alongside their code and makes version control straightforward. Its seamless integration with Javadoc further streamlines workflows by generating class documentation and UML diagrams in a unified process, while its customizable options help teams tailor the layout and appearance to specific project needs.
Full UMLGraph profile →