I haven't directly compared them to atom recently, but I've found these emacs themes to be pretty comparable: https://github.com/jonathanchu/atom-one-dark-them

I haven't directly compared them to atom recently, but I've found these emacs themes to be pretty comparable: https://github.com/jonathanchu/atom-one-dark-theme https://github.com/jonathanchu/atom-one-dark-theme https://github.com/NicolasPetton/zerodark-theme https://github.com/NicolasPetton/zerodark-theme https://github.com/nashamri/spacemacs-theme https://github.com/nashamri/spacemacs-theme (not really an atom/dark-one clone, but pretty good nonetheless)