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its NOT open source. the github package just loads stuff from their servers and does not contain the actual web container code

Sandpack is made by CodeSandbox, not StackBlitz: https://github.com/codesandbox/sandpack

Thanks for pointing out my error there. Pretty big misattribution.

Is this open source somewhere? I haven’t found it.

I had to check again if they made it opensource or if it is still just fake marketing misleading but yeah, still the same bullshit. You didn't even take the effort to validate if your "support" is really valid.