Janet’s value proposition is pretty similar to Lua — easy embedding, simple C API, minimalist runtime. But Janet improves on some weird Lua warts (block-scoped variables by default, 0-indexed collections, separate types for sequential and associative arrays). Plus it bundles a pretty nice standard library.

I’ve seen this comparison before, so clearly Janet isn’t doing a good job of explaining itself, but I think the only thing Janet and Scheme have in common are a few parentheses. Different core data structures, different feelings about mutability, completely different macro system…

Guile and Janet share PEGs (sorta) and embeddability but I didn’t think those were standardized at all. (I don’t really know any schemes.)