ryOS: The "Any Song" Karaoke App (Built Entirely on Mobile)

A fully functional karaoke station running inside the ryOS web interface. Simply paste a YouTube URL to get instant, word-synced lyrics with automatic AI translations, Japanese furigana, and Korean romanization. It features authentic typography and a clean UI. The most impressive detail: the author (@ryolu_) built this entire complex feature on a smartphone using Cursor Cloud Agents, proving you don't even need a laptop to ship high-end software.