Frequently Asked Questions

To understand the intent of SysON, see the What’s? section in the user manual.

The name SysON is a play on words that sounds such as "season" symbolizing a new season for system engineering tools and reflecting progress in the field. While "ON" doesn’t have a single predefined meaning, it evokes activation and readiness—like “you’re ON.” It can also be interpreted as “Systems ON,” highlighting its role as an enabler for digital engineering, or SysML ON, reinforcing its connection to SysML.

To understand the intent of SysON, see the What’s? section in the user manual.

To discover the SysON features, see the Key features section in the user manual.

SysON is a free and open source product licensed under the Eclipse Public License v2.

To explore the supported SysML v2 elements, read the Features section in the user manual.

Yes. SysON comes with built-in graphical editors for the core SysML v2 diagram families (structure, behavior, and requirements). These editors are implemented with Sirius Web, so they stay in sync with the underlying model and can be customized through viewpoint extensions without modifying SysON’s code base. Diagram coverage is expanding—block, interface, activity, and state diagrams are supported today, while sequence diagrams and finer‐grained styling options are on the roadmap.

To explore the supported SysML v2 views, read the Features section in the user manual.

SysON aims at full compliance with the SysML v2 specification. SysON already implements the OMG SysML v2 metamodel, including both a built-in SysML v2 and KerML implementation.

SysON aims at full compliance with the Systems Modeling API & Services specification. For more details, see the APIs section of the documentation.

No, SysON does not provide built-in features for model management such as versioning, branching, or access control. We believe these concerns are best handled by dedicated Configuration Management (CM) or version control tools, which can be integrated with SysON depending on your environment and needs. If model management is essential for your project, we encourage you to consult the Professional Support page to explore how we can help you set up the appropriate infrastructure.

Yes, SysON supports validation of SysML v2 models. It performs automatic checks to ensure conformance with the SysML v2 metamodel and key structural rules. At this stage, validation results are not yet presented directly within the graphical editors. However, this is a planned improvement for future versions, to provide more integrated and interactive feedback during modeling. Additional validation rules can also be added or customized to fit specific modeling guidelines or project requirements. If you need assistance setting up custom validations, we encourage you to consult the Professional Support page.

As a web application, SysON is inherently collaborative. However, it doesn’t include a built-in Configuration Management (CM) tool. We believe that organizations and users should have the freedom to choose their preferred CM tools, and SysON is designed to be flexible enough to integrate with them. If you require assistance integrating SysON with a specific CM tool or setting up a collaborative environment, please refer to the Professional Support page for details on available services.

To create a new model, read the Create a new model section in the user manual.

SysON is free and open source, it’s already available to try, see installation guide.

SysON is an open source project, and as such, there is no planned commercial version directly from the project itself. The focus is on fostering an open and collaborative development environment. The project provides updates and fixes on a best-effort basis, specifically targeting the latest release.

For those requiring professional support, we recommend referring to the Professional support page for information about how to obtain customized solutions and services that meet your specific needs.

No.

You can find and contribute to the best-practices page in the documentation.

To learn more about SysML v2 modeling and best practices, explore the official SysML v2 website from the OMG, join the SysON online community, and consider attending webinars and industry conferences. For hands-on learning, check out the SysON tutorials and for more detailed guidance, refer to professional support options.

SysON is a web application that can be accessed from mobile devices; however, it’s optimized for use with a minimum screen resolution of 1024 * 768 in a maximized browser window. See Prerequisites for more details.

SysON doesn’t include built-in version control. Instead, it is designed to be flexible and allows users to integrate their preferred version control systems. For more information, see Version Control and Change Management.

SysON doesn’t include built-in version control, allowing users to integrate their preferred solutions. For more details, see Version control and change management.

Yes, see the scaling limits page for more details.

Read the Import and Export section of the documentation.

Read the Collaborative modeling page of the documentation.

SysON supports import and export using the SysML v2 textual notation. Some model information can also be edited directly in textual form. The team is currently working on integrating SysON with SysIDE, an open source textual editor for the SysML v2 syntax, to provide a more complete and synchronized modeling experience.

Yes. SysON can render graphical views from a SysML v2 textual model, as long as the model is structurally valid and complete. This allows users to visualize diagrams based on models imported in textual form.

To import or export models, read the Interoperability section in the user manual.

Read the Collaborative modeling section to learn more about how to work together by using SysON.

Yes, SysON provides integrations that support modeling-related activities outside the core modeling environment.

For more advanced use cases or custom document/report generation, consult the Professional Support page.

The intent is to be fully compatible with the SysML v2 standard ensuring that models can be shared by using the SysML v2 textual notation and the SysML v2 API.

SysON is a pure SysML v2 player. Currently, SysML v1 models can’t coexist within SysON, but coexistence might be possible within your SysML v1 tool.

While addressing SysML v1 model support is currently beyond the scope of SysON, we acknowledge its potential as a valuable extension for the tool. We’re open to collaborations with individuals or organizations interested in contributing to such extensions. We invite those who share our vision and are committed to enhancing SysON’s capabilities to contact us to discuss potential partnerships.

No, SysON does not support modeling in SysML v1. It is designed specifically for SysML v2, making use of its updated metamodel, semantics, and services. If you are currently working with SysML v1 and considering a transition, we invite you to consult the Professional Support page to explore how we can help assess migration strategies or interoperability solutions.

SysON is a specialized tool for SysML v2, focusing on the latest standards and methodologies, offering robust compatibility with SysML v2 through features such as textual notation support for model import or export, full compliance with the SysML v2 API for seamless integration with other tools, and ongoing integration efforts with Capella for enhanced model interoperability.

SysON is designed to be a specialized tool for SysML v2, focusing on the latest standards and methodologies. Currently, as an open source product, SysON is primarily focused on ensuring robust compatibility within the SysML v2 ecosystem. This includes integration capabilities such as:

This will enable users to leverage SysON’s SysML v2 capabilities alongside Capella’s powerful system architecture modeling tools, ensuring model interoperability.

SysON is designed to be extensible and can support the integration of SysML v2 models with other models or modeling tools, depending on the context. While there is no built-in, generic model integration feature, SysON provides the technical foundations—such as model import/export, references, and APIs—to enable such integrations.

Common integration scenarios include linking SysML v2 models with requirements (e.g., Polarion), architecture frameworks (e.g., Arcadia), or domain-specific models. If you have a specific integration need, we encourage you to consult the Professional Support page to explore how we can help you implement it.

Yes, SysON is built on top of the SysML v2 API and Services, which provide capabilities for accessing, linking, and tracing data across engineering domains. These services expose model content in a standardized way (e.g., via REST APIs), enabling integration with external tools such as requirements management systems, simulation tools, and PLM platforms.

This supports traceability and consistency across system engineering workflows. Depending on your specific use case, additional development or configuration may be required. For guidance on setting up such integrations, see the Professional Support page.

To access professional support for SysON, see the Professional support page in the documentation, which provides comprehensive information about how to get help and the services available.

SysON is an open source product, providing users with the flexibility to customize the user interface based on their specific needs. Users can directly change the source code by forking the project and following the instructions in the developer guide to build their customized version. For users seeking professional help or customization services, feel free to contact us for personalized help with your customization requirements.

You can extend SysON with custom add-ons or extensions by using its modular architecture. Refer to the developer documentation for guidelines on creating and integrating new modules. For further help, consult the community forum or consider the professional support options.

No, SysON doesn’t include a method by default. However, being based on Sirius Web, SysON is inherently extendable. Refer to the Customization and extensions page or contact us for help.

Yes, SysON can integrate with model-to-text solutions such as M2Doc. Refer to the Customization and extensions page or contact us for help.