sdeverywhere.org

What It Is

SDEverywhere is a system dynamics modeling toolchain from Climate Interactive. It is not positioned as a general-purpose web framework; instead, it helps developers improve the quality of System Dynamics models and deploy them more broadly. Its core capability is efficiently converting models into C, JavaScript, and WebAssembly, allowing models to run interactively on the web while also supporting high-performance analysis in general-purpose languages.

Core Capabilities and Ecosystem

In terms of functionality, SDEverywhere covers key parts of model engineering: unit testing, continuous integration, comparison of model run results, and deployment across mobile, desktop, and web environments. It is especially friendly to Vensim users—the documentation explicitly notes that Vensim models can be put on the web relatively easily. It also provides a build and configuration system, allowing charts and sliders to be defined through text configuration files, along with project templates that quickly turn Vensim models into runnable web apps. Production examples include En-ROADS, C-ROADS, and Energy Policy Simulator, indicating that it is not merely an experimental project.

Open Source, Self-Hosting, and Pricing

SDEverywhere is released under the MIT License, with source code hosted on GitHub, making it suitable for teams that need auditing, secondary development, or long-term control. For self-hosting, the documentation states that generated web applications can be hosted on any server; they can also run in the sdCloud cloud environment. However, the collected content does not provide pricing, commercial support details, or paid plans for sdCloud. Therefore, it can only be confirmed that the core project is open source and free, while cloud service pricing is unknown.

Pros and Cons

Its strengths lie in a clear technical approach: C, JavaScript, and WebAssembly provide a balance of performance and distributability, while testing, CI, and run comparison bring model development closer to standard software engineering practices. The downside is that its use case is relatively narrow, mainly serving System Dynamics/Vensim scenarios. The documentation does not disclose detailed API documentation, frontend framework compatibility, installation environment requirements, or cloud service SLA, so further validation is still needed when assessing enterprise deployment costs.

Who It’s For and Access from China

SDEverywhere is suitable for research institutions, policy simulation teams, climate/energy modeling teams, and developers who need to publish Vensim models for the public or decision-makers. Access from China is not addressed in the documentation; the stability of GitHub and overseas websites may be affected by local network conditions, and payment information is not disclosed. Alternative options include Vensim’s own solutions, AnyLogic, Stella Architect, or building a custom JavaScript/WebAssembly model runtime layer.