No, it is completely open source with server too. This is main difference from Layer.

Thanks! I'm in the early stage of evaluating Atlas/Layer, and I think I'll play with your product this weekend. How do you plan to make money? I don't see any "Pricing" page.

We don't know how we will make money. Currently, we provide consulting and implement features for money. Maybe at some point donations, but i never ever seen that donations can help build big and complex stuff like this. I believe that if Actor will be quite popular we will find some way to do money, this is what i learned from my experience at Telegram.