Nowhere near CUDA. Maybe OpenCL and Metal replacement because nobody bothers to support them, so just a fallback option for AMD and ARM chips.

So then:

If your app needs CUDA, you'd need to write it in CUDA.

If you don't need CUDA, you'd write it for WebGPU instead?

If you benefit from CUDA but don't strictly require it, then you can write it in CUDA with a WebGPU fallback.

Is that right?

I think you only write WebGPU code if you are using JS or Rust for your hobby project