Can I define custom logic for it? I’m thinking it would be more helpful for me if vectors, braces, and parens were each their own color than if it marked nesting

@rob370 No idea. Check the package home page/docs. I just used it with default settings.

But you can search on http://atom.io for packages and see what else there is. As I recall, there were several packages for rainbow/colorized parens but most that I tried caused big slowdowns while editing.