Trello has a certain real-time aspect to it that lends itself very well with Elixir channels. (At least I assume this tutorial is going to use that for the real

Trello has a certain real-time aspect to it that lends itself very well with Elixir channels. (At least I assume this tutorial is going to use that for the realtime bit). Rails is coming out with something as well, called ActionCable. And finally Meteor has it with utmost simplicity as well. Just save to the database and Meteor updates the data to everyone, automatically.