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Browser-First Web Development Studio

Build, run, and ship code instantly in your browser.

GB Coder combines Monaco Editor with dual execution engines: instantaneous static web prototyping across all modern browsers, and full-stack in-memory Node.js environments via WebContainers.

Launch GB Coder StudioLaunch WebContainer IDE
Client-Side Privacy Sub-millisecond Compilation Free Forever · Zero Paywalls
In-Browser Execution
1import { createPreviewSandbox } from './studio/sandbox';
2import type { EditorConfig } from './types';
3
4// Client-side execution: direct in-browser rendering
5export function renderProjectPreview(config: EditorConfig) {
6  const sandbox = createPreviewSandbox({ target: '#preview' });
7  return sandbox.render(config.html, config.css, config.js);
8}
Syntax validation & sandbox preview: local browser thread
Ready to ship
Architecture SpecificationsLocal Runtime

Execution Model

Client-side in-browser runtime

Local

Data Privacy

Zero server storage; client-only execution

Strict

Distribution

Static pre-rendered architecture

Static
Live across all modern browsersView all verified tools →

How GB Coder operates

Three straightforward principles guide every utility on our platform.

Step 1

Direct In-Browser Launch

Zero logins or API setup

Step 2

WASM & Local AI

100% on-device sandboxing

Step 3

Instant Deployment

Clean code, zero paywalls

01

Instant Browser Access

Open any utility and start immediately. No login, API keys, or credit cards required.

02

Local Client Execution

Your files, code snippets, and assets are processed strictly within your device's memory.

03

Direct Download & Sovereignty

Export your processed output instantly. Nothing touches an external server.

Two Purpose-Built Coding Engines

Choose the ideal runtime for your workflow: ultra-fast static web prototyping or complete in-browser Node.js development.

Universal Browser SupportInstant Client Sandbox

Static & Multi-File Prototyping

Zero-setup coding for HTML5, CSS3, and JavaScript. Monaco editor with real-time DOM synchronization, syntax highlighting, format-on-save, and CDN script injection.

Sub-millisecond DOM synchronization as you type
External CDN library injection (Tailwind, Lucide, Bootstrap)
Supported across modern desktop and mobile browsers
Zero build delayStart Prototyping
Full-Stack Micro-OSNode.js In-Browser

Advanced WebContainer IDE

Full-stack Node.js environment running directly in browser memory. Run npm install, execute package scripts, boot Vite development servers, and work with full React and Vue starter architectures.

Execute Node.js runtimes and npm package installations
React & Vue starter templates with hot module reloading
SharedArrayBuffer & Web Worker isolated sandbox
Chromium & FirefoxLaunch WebContainer IDE

From Raw Prompt to Running WebContainer

See how GB Coder eliminates manual toolchain setups, Docker configurations, and cloud VM spin-up times. Write code, trigger AI full-stack synthesis, and execute real Node.js runtimes right inside your browser with zero latency.

Dockerfile
before: legacy local setup
// Legacy local development setup
FROM node:20-slim
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build
EXPOSE 3000
CMD ["npm", "start"]
# Problems: 45 min setup, Docker drift, local port conflicts, no AI assistance
app.ts
after: gb coder in-browser ai ide
// GB Coder: in-browser AI IDE
import { createApp } from '@ladestack/gb-coder';

const app = await createApp({
  ai: { model: 'claude-3-sonnet', temperature: 0.2 },
  runtime: 'webcontainer',
  telemetry: false,
  storage: 'indexeddb',
});

const result = await app.synthesize(
  'Build a responsive landing page with Tailwind',
  { output: './dist', preview: true }
);
console.log(result.url); // http://localhost:4321 — zero setup, instant

In-Memory WebContainers

Execute Node.js 20, npm packages, and live dev servers inside browser memory with instant cold starts.

AI Full-Stack Generation

Prompt the integrated AI assistant to scaffold multi-file architectures, APIs, and client-side frontends.

Zero Cloud Telemetry

All code and files stay in local IndexedDB storage. Zero server tracking, zero subscription barriers.

Engineered for Precision, Speed, and Privacy

Every feature in GB Coder was built to deliver enterprise coding capabilities inside your browser.

VS Code Engine

Monaco Code Editor

The same industry-standard code editor behind VS Code. Features TypeScript syntax validation, autocomplete, multi-cursor editing, bracket matching, and code folding.

Synchronized DOM

Instant Live Preview

Instant preview renders your HTML, CSS, and modern JavaScript as you type. Includes detached popout preview windows and mobile QR code inspection on local networks.

Node.js in Memory

WebContainer Micro-OS

Execute genuine Node.js processes, run npm package scripts, boot Vite development servers, and prototype with full React and Vue starter architectures directly in browser memory.

Client-Side Privacy

Local-First Persistence

Workspaces are saved securely to IndexedDB on your device. Local development operates without mandatory account signups or background server telemetry uploads.

Modular Structure

Multi-File Architecture

Organize complex web components across multiple files and directories with clean file explorer navigation and tab management.

ZIP Archives

Tamper-Proof Backups

Export workspaces into standard ZIP archives anytime with full directory structures preserved. Restore previous projects with single-click import.

Built for modern engineering workflows

From indie developers to enterprise engineers who value data privacy.

Workflow Focus

Frontend Developers

Prototype layouts, inspect HTML/CSS/JS components, and test modern web patterns with instant feedback.

  • Dual-engine execution: WebContainers and Static Editor
  • Monaco Editor with syntax highlighting and multi-file tabs
  • Real-time live preview with QR device testing and ZIP export
Launch GB Coder
component.preview60 FPS
Live Sandbox Active
HTML5 · CSS3 · ESNextZero Dependencies
Technical Guardrails & Boundaries

WebContainer Runtime & Browser Compatibility

GB Coder leverages WebContainers for running genuine Node.js processes inside modern browsers that support SharedArrayBuffer and cross-origin isolation (COOP/COEP).

For lightweight prototyping or environments where WebContainer isolation headers are restricted (including Apple Safari), our Static Editor provides an instant fallback with zero external dependencies, ensuring seamless coding across modern browsers.

Supported Environments

Google ChromeWebContainer + Static
Microsoft EdgeWebContainer + Static
Brave BrowserWebContainer + Static
Mozilla FirefoxWebContainer (COOP/COEP)
Apple SafariStatic Editor Mode

Ready to write, run, and ship code in your browser?

Launch GB Coder right now with zero installation. Experience Monaco Editor and in-browser Node.js workflows today.

Launch GB Coder StudioExplore All Utilities

GB Coder by LadeStack · Browser-First Architecture · Free to Use