Custom Udon is presented as a 3D anime-inspired simulation game for players who want to create characters, build virtual environments, and tell interactive stories. Its character creator offers options for appearance, clothing, accessories, expressions, and animations, while world-building tools let users arrange props, backgrounds, lighting, and other scene elements. Players can shape narratives with dialogue, choices, scripted events, and interactive objects, using a built-in Udon scripting engine that the site says does not require advanced coding.

The experience also features quests, missions, mini-games, and events, with opportunities to preview creations in real time or VR and share multiplayer spaces with friends. Custom Udon is aimed at anime fans, creative writers, original-character and cosplay enthusiasts, and casual creators. The website describes the app as free and lists version 8.

2 for Android, with a stated file size of 228 MB. It also promotes APK downloads and claims to offer offline access, unlocked content, and ongoing updates