Do guests need an app?

No. Guests scan the QR code on the TV or type the room code at mindbrawl.gg. The phone browser is the controller.

What do I need to host?

Any screen with a web browser, such as a smart TV, a laptop on HDMI, or a cast tab. Everyone else needs a phone.

Yes, if one person shares the TV screen in the call. Everyone joins with their own phone.

Players join by scanning a QR code on the TV or typing the room code at mindbrawl.gg, with no app to install.
Up to 50 players can join one room, and two people are enough for a game.
Mind Drop gives ten questions a day, the same for everyone, with country-wide scoring.
Brain Swarm lets a streamer play against an entire chat, with thousands in one game.
Ranked Brawls are one-on-one matches with a fighting-game-style leaderboard to climb.
Brain Gym offers ten-minute daily sessions to learn the answers you missed.

Hosting a game and playing are free. There is nothing to buy to start a party.

Runs on any screen with a web browser, such as a smart TV, a laptop on HDMI, or a cast tab.
You can play over a video call if one person shares the TV screen in the call.
Fast right answers score more.

Is Mindbrawl free?: Yes. Hosting a game and playing are free. There is nothing to buy to start a party.
Do guests need an app?: No. Guests scan the QR code on the TV or type the room code at mindbrawl.gg. The phone browser is the controller.
What do I need to host?: Any screen with a web browser, such as a smart TV, a laptop on HDMI, or a cast tab. Everyone else needs a phone.
Can we play over a video call?: Yes, if one person shares the TV screen in the call. Everyone joins with their own phone.

Trivia, but it's a fight

Phones are the buzzers