Gcast

GCast lets two phones share one screen, so you and a friend can play side
by side even when you aren't in the same room. Cast from your iPhone, hand
half the screen to someone else, and play.

What you can do:

- Cast your iPhone to another iPhone or iPad.
- Share that screen with a friend so two games run side by side.
- Create a private room with a short code and send the link.
- Get a pop-up the moment a guest asks to join, so you don't miss anyone.
- Pick a nickname and a pixel-art avatar instead of being a random string
of characters.
- Play over the internet, not just Wi-Fi.
- Built on WebRTC, so the lag stays low enough to actually play through.

Works for couch co-op, late-night online sessions, watch parties, and
whatever else.