Principle (GoodUI / Psychology of Persuasion): You visually emphasize the
Pro Plan using a
black button and a
slightly darker card appearance, subtly guiding user attention toward the higher-value option. This technique, often referred to as the
Decoy Effect, leverages contrast and emphasis to make one option feel like the natural or “recommended” choice. By visually framing the Pro Plan as more premium and dominant, users are nudged toward upgrading—
a proven conversion design strategy observed in cognitive psychology and supported by
GoodUI.org.