Stackblitz

StackBlitz is a browser-based IDE for web developers, teams, and educators that provides instant full-stack JavaScript development environments without local setup.

Key capabilities include:

• In-browser Node.js runtime (WebContainers) that boots environments in milliseconds and supports fast iteration with hot reloading and live preview
• VS Code-like editing experience with a familiar interface and support for extensions for day-to-day development workflows
• Dependency and repo workflows with NPM package support plus GitHub import and export for version control and sharing
• Real-time collaboration and sharing via URLs, plus offline-capable PWA behavior for working without a constant network connection

Pricing: Freemium, core features are free; enterprise plans are paid.

What makes it notable: Unlike legacy cloud IDEs that run code on remote servers, StackBlitz runs compute inside the browser tab via WebContainers (a WebAssembly-based operating system), which enables low-latency development, quick resets (refresh), and offline use. An enterprise option targets high-security teams with features such as SSO, private NPM, and on-prem support.