Ranked in these QuestionsQuestion Ranking
Pro Type Inferred
Opa uses type inference to decide what code runs on the client or the server, so you can organize code how you like, but still be sure that it runs where it needs to.
Pro Client and Server in the same language
Pro Interactive REPL
You can evaluate new Python code in the browser written by the user.
Con Not popular
Con Python 2.6
Skulpt implements an outdated version of the Python language.