SigPro

The Atomic Reactivity Engine for the Modern Web.

SigPro is an ultra-lightweight reactive rendering engine that redefines efficiency. No Virtual DOM, no heavy compilers, and zero dependencies. Just surgical reactivity packed into less than 2KB.

Explore the Docs →

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The SigPro Manifesto

SigPro isn't just another framework; it’s a precision tool. While other frameworks try to guess what changed by comparing trees (Diffing), SigPro already knows.

• ** Atomic Reactivity:** Powered by a Signal-based architecture, SigPro binds state directly to DOM nodes. When a value changes, only that specific node reacts.
• ** Zero Overhead:** Forget hydration bottlenecks and 100KB bundles. SigPro is pure, optimized JavaScript tailored for the browser's engine.
• ** Next-Gen DX:** Say goodbye to endless imports. SigPro injects smart helpers like Div(), Button(), and Span() directly into your environment for a clean, functional syntax.
• ** Batteries Included:** Hash-based Routing, native localStorage persistence, and automatic lifecycle management (cleanups) come standard.

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A Glimpse of the Code

Elegance stems from simplicity. Here is how you create a reactive, persistent component:

// main.js
const Counter = () => {
  // Persistent Signal: automatically restores state after reload
  const count = $(0, "user-counter-pref"); 

  return Div({ class: "card-container" }, [
    H1(`Count: ${count()}`),
    P("Click below to trigger an atomic update."),
    Button({ 
      onclick: () => count(c => c + 1),
      class: "btn-primary" 
    }, "Increment +1")
  ]);
};

$mount(Counter, "#app");

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Performance Breakdown

Metric	SigPro	React / Vue	Svelte
Weight (Gzipped)	< 1.8KB	~30KB - 50KB	~2KB (Runtime)
Strategy	Atomic Signals	Virtual DOM Diffing	Compiler Dirty Bits
Update Mechanism	Direct Node Access	Branch Re-rendering	Block Update
Persistence	Native ($)	Manual / Plugins	Manual
Learning Curve	Flat (Vanilla JS)	Medium / High	Medium

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Recommended Architecture

SigPro scales beautifully with modern project structures:

app/
├── 📂 components/   # UI Atoms (Button.js, Input.js)
├── 📂 pages/        # Main Views (Home.js, Dashboard.js)
├── 📂 store/        # Shared Global Signals
├── 📄 App.js        # Layout, Router & Navigation
└── 📄 index.js      # Entry Point & Mounting

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Quick Install

Install via your preferred package manager:

npm install sigpro

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License

MIT © 2026 SigPro Team. Engineered for speed, designed for clarity.