A Multiplayer Piano Game in Your Browser

Piano multiplayer without a download

Most "piano games" ask you to install an app or make an account before you can touch a key. A browser game skips all of that: you open a link and you are in. That is not just convenient, it is what makes casual multiplayer possible, because a friend can join a session in the time it takes to paste a link, and it works on locked-down machines, a school Chromebook, a work laptop, where installing software is off the table.

ChordRunner is a chord and keyboard game rather than a free-play piano, so "winning" means playing the right chord at the right moment. That is what makes it fair to score head to head, and what makes it double as real chord training while you compete.

How you join a live session

Every supported mode shows a live count of running sessions. A mock of that session browser, tap a room to join:

In the real game these rooms are filling in real time; you join one, or create your own and share it.

Your keyboard is the controller

Web MIDI auto-detection

Any USB or Bluetooth MIDI keyboard works in the browser through Web MIDI: plug in, allow access once, and the game detects it automatically when a run starts. There is nothing to configure, and because it is all in the browser you can play from any computer without admin rights. New to it? Connecting a keyboard takes about thirty seconds.

No MIDI? Use a microphone

An acoustic piano with no MIDI out is still welcome. Microphone mode listens to your instrument and recognises the chord you played from the audio, in real time, in the browser. Two players in one session can even mix inputs, one on MIDI, one on a mic, since the game only cares whether the chord was correct.

Fair, fast and in real time

A browser game only counts as real multiplayer if it feels immediate. Sessions use a synchronised countdown, score everyone against the same clock over a websocket, and start every player from zero each round, so the result reflects playing, not luck or lag. It is the same competitive core as a multiplayer chord game and the chord battle format, aimed squarely at keyboard players. The whole picture lives on real-time multiplayer music learning.

Play a browser piano session now

Open the game, connect your keyboard or allow the microphone, and join a session on any mode, the chord levels are the easiest place to start. No install, no account for the demo, and it runs on whatever computer you are sitting at. Bring a friend by sharing the room.

Common questions

Is there a multiplayer piano game that runs in the browser?

Yes. ChordRunner is a browser-based multiplayer music game you play with a piano or keyboard: no install, no signup. You join a live session and play chords in real time against or alongside other players, using a MIDI keyboard or your microphone.

Do I need to install anything or create an account?

No. It runs entirely in the browser, so there is nothing to download and you can play the demo without an account. That also means it works on locked-down machines like school or work computers, where installing software is not an option.

How does the game read my piano?

Two ways. A MIDI keyboard connects through Web MIDI and is detected automatically when a run starts, giving note-perfect feedback. With no MIDI, the microphone listens to your acoustic piano and recognises chords from the audio in the browser.

Is a browser multiplayer piano game fast enough to be fair?

Yes. Sessions use a synchronised countdown and score everyone against the same clock over a websocket connection, and each match starts every player from zero. Your input is judged locally as correct or wrong, so the competition is about your playing, not your ping.