I think you know best what you want to build yourself. :-) If you separate the abstract interface for sending/receiving game states and its implementation, you

I think you know best what you want to build yourself. :-) If you separate the abstract interface for sending/receiving game states and its implementation, you can rely on an external service like hushfile to get started, and then switch to running a similar service yourself afterwards. Saves you from having to deploy and maintain the server initially. Running a VPS wouldn't cost more than $5/mo. Since nobody mentioned it, you may want to consider: https://boardgame.io/ https://boardgame.io/ It is a service specifically for managing JSON game state. But it comes with its own ideas, so your mileage may vary.