Not done a slackbot (yet?), only a few small app and a large 7-yr-project, but with Rails it's really about whether or not you love Ruby. There's still Sinatra

Not done a slackbot (yet?), only a few small app and a large 7-yr-project, but with Rails it's really about whether or not you love Ruby. There's still Sinatra but that's about it in regards to web-frameworks. Rails is perfect for punching out a prototype quick and heroku (which started as an online Rails-editor) make delivery very easy. Try ruby and see if you like the language.