Morsel – an open-source, web-based visual Modelica editor

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Hey HN, I’m excited to share Morsel, a modern, web-based visual editor for Modelica that I've been working on. It's part of the broader ModelScript compilation, analysis, and visualization framework. Modelica is a powerful, object-oriented language for equation-based modeling of complex physical systems (mechanical, electrical, electronic, hydraulic, thermal, control, etc.). However, tooling in the Modelica ecosystem has historically been heavy, proprietary, or desktop-bound. I built Morsel to bring a fast, beautiful, and accessible Modelica modeling experience right to the browser. Key Features ============ - Interactive Diagrams: High-performance visualization of Modelica connections and topologies using AntV X6. - Synchronized Code Editor: Real-time, two-way synchronization between the visual diagram and the underlying Modelica code (powered by Monaco Editor). - Intelligent Properties Panel: Easily edit component parameters, modifiers, and annotations through a responsive UI that directly manipulates the AST. - Library Explorer: Navigate complex Modelica libraries (like the Modelica Standard Library) via an intuitive hierarchical tree view. Under the Hood: ModelScript =========================== Morsel is powered by ModelScript, a custom compilation engine written in TypeScript. ModelScript brings its own modern toolchain to Modelica: - Custom Tree-Sitter Grammar: Fast and precise parsing for editor integrations and tooling. - Semantic Analysis: Full scope and name resolution for complex Modelica hierarchies. - Model Flattening: Translating hierarchical component architectures into flat Differential Algebraic Equations (DAEs). Why I built this ================ I wanted an open-source (AGPL-3.0), modern front-end that could run entirely in the browser (or as a local web app) without sacrificing the power of the Modelica language. It's built on a modern stack (React, React Router, Vite, Tailwind, GitHub Primer) to provide a premium, responsive developer experience. I am still actively developing Morsel and ModelScript and would love your feedback, bug reports, and contributions! GitHub Repo: https://github.com/modelscript/modelscript I'd be happy to answer any questions about the architecture, Modelica parsing, the tree-sitter grammar, or anything else!

Visit product View on Hacker NewsFeb 26, 2026

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