YBULTRA is an iOS app focused on improving user color perception. The game uses slider adjustments to let users try to match a given target color and provides an interesting user experience with beautiful animation and gamified design.

- Multiple game modes: Training mode, Challenge mode, Daily Challenge and Color Theory mode
- Advanced Difficulty: 4 difficulty levels from simple to expert
- Color Theory Learning: Contains 10 color theory courses to help users learn basic color knowledge
- RGB and HSB dual color mode: Supports adjustment of two mainstream color models
- Statistics and progress tracking: Record game data and display learning progress