Themely: Flutter Theme Manager for Dark, Light and Custom Themes

Themely is a production-ready Flutter theme management package built for developers who want full control over their app's visual identity without writing boilerplate. It supports four built-in modes (light, dark, AMOLED, and system) plus unlimited custom named themes. Semantic color tokens are accessed through type-safe BuildContext extensions like context.themeColors and context.isDark. Theme preferences are persisted automatically via SharedPreferences, so users always get their last-used theme on app restart. Switch themes with smooth AnimatedTheme transitions, schedule automatic mode changes by time of day, or let users preview a theme before committing. Widget switchers (ThemeIcon, ThemeAsset, ThemeText, ThemeLottie) eliminate manual ternary checks, and a built-in debug overlay helps you inspect active color tokens at a glance. Extensible by design: plug in a custom storage adapter, subclass AppThemeTokens to add brand-specific colors, or drive scheduling from battery state, location, or any external signal. Works across Android, iOS, Web, macOS, Linux, and Windows.