🎮 C# Playground

Write C# code below and click Run. Everything runs in your browser — nothing is sent to our servers. No signup, no install, no nonsense.

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🎮

C# can't run inline (yet)

Some languages need a real compiler or runtime that doesn't fit in a browser. But you can run C# instantly on these free platforms:

Open in Replit ↗ Open in OneCompiler ↗

Sample C# code:

C# example

// Unity script for player jump
void Update() {
    if (Input.GetKeyDown(KeyCode.Space)
        && isGrounded) {
        rigidbody.AddForce(
            Vector3.up * jumpPower
        );
    }
}

Try these C# examples

Click any example to load it into the editor:

A note on this playground

Code runs in your browser using open-source engines (Pyodide for Python, native JS for JavaScript, AlaSQL for SQL). Nothing is sent to OneCity's servers. No accounts, no tracking. If you save your work, copy-paste it somewhere else — refreshing the page resets the editor.