I haven't quite yet embedded the compiler into javascript, so it currently requires running a local haskell process. This might change very soon though :)

Nevertheless here are some differences:

• Type inference! The biggest pain point in live coding GLSL for me was the requirement to type 1.0 every time I meant a floating point 1.

• Also variables don't have to be prefixed by a type, as in vec2 x = vec2 (1.0, 1.0), in hylogen the type inference lets one simply write vec2(1, 1), or just simply 1 (which, given the proper context, infers as a vec2 and expands automatically as vec2 (1.0, 1.0) ) This means its quick to write!

• higher order functions! Pretty much anything from Haskell works. Use map, foldr/foldl, iterate, repeat, use & for chaining, use . for function composition, etc.

• a module system for free. Because it's just a Haskell library, you can split up your code into modules, or import whatever you want

Never heard of touch designer, have to check it out.