ATLAS is crossplay enabled to allow Xbox and PC players to play together in the same world!

Is ATLAS cross platform Xbox and PS4?

There's been no official confirmation on Atlas coming to the PS4 at this point, but one thing stopping it might be the fact Sony is reticent about adding an Early Access program for its current-generation console. The PC version had it, the Xbox One supports it, but PS4 doesn't.

How does ATLAS crossplay work?

It has launched Day One with crossplay support allowing Steam and Xbox to play together in the same gigantic world. Complete re-bindable keyboard and mouse support for Xbox players ensures full game parity and an even playing field for all players.