Fay vs Mint

Fay produces smaller output than pure Haskell compilers such as GHCJS; It does not need to include the whole Haskell runtime, as it drops support for features such as multi-threading, giving it fewer dependencies.

As with UHC, the FFI to Javascript works with printf-style format:

max = ffi "Math.round(%1,%2)"

This can simplify code needed to make calls to methods on objects, in contrast to e.g., Purescript's FFI, which requires that methods be wrapped in Javascript. Similarly to UHC, Fay also supports the use of %*, for javascript functions with arbitrary numbers of parameters, such as concat, though they must expose an explicit number of parameters to Fay.

Fay is available on Cabal, as are Fay packages, so getting up and running is as simple as typing 'cabal install'. Happstack, Snap, and Yesod packages are available on Hackage, as are bindings for JQuery and Backbone.

Since Fay is a subset of Haskell - Lazy, statically typed, and pure by default. There's no new syntax to learn, and no surprises when it comes to the semantics of your code. This extends into function names as well - Fay programmers can use familiar functions such as putStrLn to output to the console, rather than Javascript-specific versions.

Crystal is one of the best and elegant languages.

Everything is an expression.

HTML can be written with minimal differences.
Scoped .CSS can be written for elements in components.

200+ unique error messages to help you on the way.

Everything is typed using a simple type system

Only used parts of the code compiles into the final bundle.

Mint has a built-in formatter to format your code, it can run standalone or with the development server.

Mint contains everything you need to build the frontend of web applications from styling to data storage through HTTP requests to testing.

Testing is part of the language and there is a test runner built in which runs tests in the browser.