Debug.isDebugBuild

Description

In the Build Settings dialog there is a check box called "Development Build".

If it is checked isDebugBuild will be true. In the editor isDebugBuild always returns true. It is recommended to remove all calls to Debug.Log when deploying a game, this way you can easily deploy beta builds with debug prints and final builds without.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        // Log some debug information only if this is a debug build
        if (Debug.isDebugBuild)
        {
            Debug.Log("This is a debug build!");
        }
    }
}