Show HN: The Kio Programming Language
An ultra-portable, embeddable programming language that compiles to host languages.
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Kio is a statically typed, hosted language that is designed to be ultra-portable. Kio 0.1 supports eight host languages and more will be added in the coming weeks.
Kio is based on polymorphic lambda calculus with higher-kinded types. Kio has type-driven macros (elaborators) and it can statically check asserted equivalences using a normalizer.
Kio is a minimalistic language. It doesn't have built-in effectful functions and it doesn't even have built-in string or numeric types. Instead programs declare the capabilities they need and the host supplies them.
The language is designed with AI, which is bound to raise some eyebrows, so I blogged about that here: https://jdevuyst.github.io/kio/blog/2026-10-01-introducing-k...
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