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Why WebAssembly Instead of ROS or ROS 2?

· 2 min read
Jaegyeom Kim
Jaegyeom Kim
Robotics Software Engineer

ROS and ROS 2 are excellent choices for building complete robot systems. They provide communication, tools, drivers, visualization, and a large ecosystem.

This blog post has a narrower goal: make the mathematics of kinematics, planning, and dynamics visible and runnable in a browser.

A different problem​

This blog post is not trying to operate a robot or connect multiple hardware nodes. It demonstrates forward kinematics, inverse kinematics, motion planning, and dynamics.

For that purpose, the main requirement is a small, self-contained program that anyone can open and run without preparing a robotics development environment.

Why WebAssembly fits​

  • No installation: visitors do not need ROS, ROS 2, a workspace, or system packages.
  • Runs in the browser: the same page works on Linux, macOS, Windows, and mobile devices.
  • Interactive visualization: sliders and 3D controls can call the compiled algorithms immediately.
  • Native implementation: the computational core remains C++ and is compiled to WebAssembly rather than rewritten in JavaScript.
  • Easy sharing: a static site can host the complete example without a backend or robot middleware.

What ROS or ROS 2 would add​

ROS or ROS 2 would be the better choice when the example needs hardware drivers, sensor streams, distributed nodes, robot description files, lifecycle management, or integration with a larger autonomy stack.

Those are system-integration requirements, not requirements for explaining the underlying mathematics. ROS and ROS 2 organize a running robot system, while WebAssembly packages a computation so that it can run inside a web page.

The practical boundary​

The browser demo keeps the algorithmic core small and observable. A real robot application can still use the same C++ concepts inside a ROS or ROS 2 node, where middleware connects the planner and controller to sensors, actuators, and other processes.

For this project, WebAssembly is a presentation and distribution choice. It lowers the barrier to experimentation while keeping the robotics implementation close to the native C++ code.