Theme switchers enable users to customize application appearance with multiple color schemes, enhancing personalization and brand flexibility. As the creator of CoreUI, a widely used open-source UI library, I’ve built theme switchers for enterprise Vue applications throughout my 11 years of frontend development. The most versatile approach is managing theme state reactively and applying theme-specific CSS custom properties. This method supports unlimited themes, smooth transitions, and maintains persistent user preferences across sessions.

Dark mode improves user experience by reducing eye strain in low-light environments and has become an essential feature for modern web applications. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented dark mode in Vue applications throughout my 11 years of frontend development. The most effective approach is using Vue 3 Composition API with reactive state and CSS custom properties for theme switching. This method enables smooth theme transitions, persists user preferences, and maintains clean separation between logic and styling.