It’s like iex, but in your web browser.
If you ever accidentally entered a new line in the middle of expression and didn’t know how to stop iex from interrupting itself completely, don’t type #iex:break, use Livebook instead!

• You can use the same iex short functions - just import IEx.Helpers in the “Notebook dependencies and setup” at the top of your notebook.
  

  

  image946×222 10.3 KB
  
  Voila!
  
  

  image920×174 5.77 KB

• You can add dependencies and even search for them by typing keywords.
  

  

  image592×266 11.9 KB

• Auto-completion actually works even on Windows and OTP < 26 - just wait a few seconds. Help windows popup as you type. Hover over symbols and see what they represent.

• You organize your interactions using separate notebooks.

  • You can add your notes as you go.
  • The resulting notebook file is a valid Markdown, to share quickly or save for the future.
    • If you forget to save them, they are auto saved. You can restore it right from the Livebook.

• You can attach to a running iex session if you initiate iex with iex --sname test --cookie mycookie. That includes your Phoenix app (just add -S mix phx.server). Simply tap Processor icon, Disconnect and Configure an attached node.

It’s an Elixir LEGO.

Yes definetly, it is like having a REPL on steroids, I think that the biggest potential for livebook is as a learning tool.