GraalVM is focused on performance and is mainly developed in Java. MetaCall is focused on UX experience more than performance and it's written mainly in C/C++. There are other differences like the license (GPL vs Apache 2.0) respectively, but those are the main ones.
We do not reimplement the runtimes, meanwhile, they do it. That's harder to maintain.
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GraalVM is focused on performance and is mainly developed in Java. MetaCall is focused on UX experience more than performance and it's written mainly in C/C++. There are other differences like the license (GPL vs Apache 2.0) respectively, but those are the main ones.
We do not reimplement the runtimes, meanwhile, they do it. That's harder to maintain.