[oblique63]

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/NicolasPetton/zerodark-theme

https://github.com/nashamri/spacemacs-theme (not really an atom/dark-one clone, but pretty good nonetheless)