Reflex is great (and its author is a genius) but it's not really useful yet for non-desktop apps. Because Reflex + GHCJS is impossibly slow on mobile.

As an experiment, try using chrome (iOS) or android to load this:

obsidian.systems/reflex-nyhug/

or this:

https://obsidian.systems/

They're both reflex apps.

GHCJS is bees-knees. But unfortunately, minimizing-code-size/mobile-performance has not been a priority. (It's understandable, as Luite can't do everything himself.) (Aside: the best solution I've seen -- in terms of generated code size -- in GHCJS-land right now is: https://hackage.haskell.org/package/react-flux. Anecdotal, though. YMMV.)

I can't wait for GHCJS to be ready for prime time. I wish all these alt-JS-haskellish language authors (of Purescript, Elm, Roy, etc.) would just work on making GHCJS better.

It's a bummer that Clojure and Scala are much newer than Haskell and yet they both have a mature, production-ready JS compiler. The statically typed ML-family is too small for multiple JS compilers. The entire community needs to pick one and let the others die. Otherwise, we end up with several half-baked solutions and not a single industrial-strength one.