Divinity: Original Sin 2 | Koop mode with PS4 Plus?

Does the co-op mode for this game also go without the Playstation Plus membership or is this Zwinged needed? Would look forward to a quick response.

One more question:

How is the game so compared to Diablo 3?

Splittscreen would have to work without PS +

In comparison with Diablo 3 Divinity is much storylastiger and slower (in a good way) D3 is fast monster action without a big story

I play both, if I do not have much time I play Diablo 3, if I have more time Divinity