System Designer is a free low-code development platform available as a Chrome add-on, designed to simplify the creation of systems through visual modeling. Utilizing UML standards, it allows users to define models in a human-readable format called MSON, facilitating the creation of classes, relationships, and multi-inheritance structures without extensive coding knowledge. The platform generates method skeletons automatically, enabling developers to focus on implementing functionality instead of boilerplate code.

The program offers graphical component creation, functioning as an Object-Document Mapper (ODM) for managing components akin to NoSQL documents. Users can run and debug their systems directly from the platform, with real-time updates reflecting changes made to the model. Compatible with multiple operating systems and devices, including Windows, macOS, and Android, System Designer also integrates with GitHub for seamless project synchronization across devices.