Leva is a React‑focused GUI library that provides a ready‑to‑use, highly customizable set of input controls (sliders, toggles, numeric fields, etc.) and a hook‑based API for instantly wiring them into any component, enabling developers to build interactive editors, live‑preview interfaces, or configuration panels with zero setup. It’s aimed at front‑end engineers who want to add powerful, keyboard‑accessible UI controls to React apps—especially creators of design tools, data visualizers, game developers, or anyone building real‑time, parameter‑driven React components.