A Complete Web Development Studio in Your Browser Tab

Instant three-panel layout for rapid front-end experimentation. Type HTML markup, style with CSS, and script with modern ES2024 JavaScript with zero build steps or bundling delays.

• Instant DOM rendering as you type with debounced evaluation
• Built-in virtual console capturing log, warn, error, and info calls
• Support for external CDN scripts (Tailwind, Bootstrap, FontAwesome, React CDN)
• Multi-file static project organization with clean asset references

A WebAssembly-based micro-operating system executing genuine Node.js binaries directly within your browser thread. Run real package managers and development servers without remote compute.

• Full interactive xterm.js terminal with command history and ANSI styling
• Support for npm install, npx scripts, and Vite dev server processes
• Hardware-accelerated execution secured by cross-origin isolation (COOP/COEP)
• Local port forwarding directly to the integrated iframe preview

The exact editing engine powering VS Code, optimized for browser memory and responsive typing. Includes language servers for TypeScript, JavaScript, HTML, CSS, and JSON.

• IntelliSense autocompletion with inline type documentation
• Automatic syntax validation and inline error diagnostics
• Multi-cursor editing, bracket matching, and customizable keybindings
• Side-by-side split editor mode and integrated diff viewer for revisions

Kickstart new projects with clean, battle-tested boilerplates. Switch effortlessly between single-file component sandboxes and full multi-file Vite applications.

• React 18 starters with JSX/TSX support and React DOM preview
• Vue 3 starters with Single File Component (.vue) compilation
• Template gallery covering landing pages, utility apps, and dashboard layouts
• One-click template cloning into isolated IndexedDB workspaces

Your source code is stored locally on your device in browser IndexedDB databases. No remote cloud storage, no mandatory account sign-ups, and no telemetry tracking.

• Transactional IndexedDB persistence surviving reboots and offline sessions
• Immediate workspace state restoration on reload without latency
• Zero transmission of proprietary source code to external servers
• Full user control: wipe or export project data anytime directly from settings

Never lose a project. Export full directory trees as standard ZIP archives and restore them on any machine with built-in integrity verification.

• Standard ZIP packaging preserving exact file permissions and paths
• SHA-256 integrity hash calculation ensuring archive validity
• Drag-and-drop archive import with structural preview before unzipping
• Seamless portability to local desktop VS Code or Git repositories

Inspect your application with hot-reloading DOM updates. Pop out the preview into an independent window for dual-monitor workflows or test on mobile via QR code.

• Sandboxed iframe execution preventing script contamination
• Detached popout window with bidirectional state synchronization
• Mobile preview QR code for instant real-device responsive verification
• Customizable preview dimensions (Mobile, Tablet, Desktop viewports)

Find and replace across multi-file projects, inspect differences, format code, and manage external dependencies with integrated developer toolbars.

• Global project file search with instant regex and case sensitivity
• Built-in Prettier formatting for HTML, CSS, JavaScript, and TypeScript
• Diff review modal comparing current edits against saved checkpoints
• Responsive toolbar designed for desktop, tablet, and compact laptop screens