“UI FX” refer to a set of audio cues triggered instantly by the system in response to user interactions with the graphical interface of software or applications. It encompasses all audio feedback related to user interface interactions—from button click sounds to page transition effects.

For instance, the “Title Sound” serves as an “auditory business card” during the user’s first contact with the product, carrying high recognizability and brand value. It is a distinctive sound played when users enter the main interface of an app or game—often concise yet highly memorable. Another example can be found in Honor of Kings: each time a player selects a hero, purchases equipment, or activates a skill, corresponding UI sound effects accompany the action. These sounds not only enhance the gaming experience but also help players better understand the current game state.