Leptos Has a Free API: Build Full-Stack Web Apps in Rust With Fine-Grained Reactivity

Leptos is a Rust framework for building full-stack web applications with fine-grained reactivity — similar to SolidJS but compiled to WebAssembly for near-native performance. Why Leptos Matters JavaScript frameworks ship a runtime to the browser. Leptos compiles to WebAssembly, delivering reactive UIs with zero JS runtime overhead. It also supports server-side rendering with hydration. What you get for free: Fine-grained reactivity (only updates what changed — no virtual DOM) Full-stack: SSR + client hydration in one Rust codebase WebAssembly compilation for near-native browser performance Type safety across client and server Built-in router, forms, and server functions Component size: ~5KB gzipped for a counter app Quick Start # Install cargo install cargo-leptos # Create project cargo leptos new --git leptos-rs/start cd my-project # Development cargo leptos watch # Build for production cargo leptos build --release Reactive Signals use leptos :: * ; #[component] fn Counter () -> impl