Consider the paintbrush: simple enough for a child, complex enough for an Old Master. That's what any artistic tool should strive for, and the art of programming deserves a tool that's more creative, more alive. Joy.js is a tool for making tools like that.
EASY & EXPRESSIVE With regular coding: tweak a number, compile, see the result seconds later, tweak again, repeat 'til bored. With Joy.js: change the code by clicking / dragging / hovering, and see the result immediately. This lets you improvize, and discover "happy little accidents"!
SEE WHOLE SYSTEMS No need to second-guess the program, to "play computer" in your head. If you want to understand what a system does, you can simply hover over the step numbers, and see the system build itself step by step.
SAVE & SHARE And finally, when you make a tool with Joy.js, your users will be able to save and share their work, and remix each others' creations! (Note for developers: Joy.js "saves data" in the URL itself... meaning, no need to set up a server or database!)