This really let me see what breadboards are for and how they work. So, it might be less about readability and more a practical toy.

Check out Tinkercad. I don't think the program simulator in it is as cool or as in-depth, but you can program a virtual Arduino with it and hook up wires to a breadboard along with many other common components and have some outputs too.

You have to rewind it before you can play it