StackBlitz
FreeInstant dev environments that boot Node.js inside your browser tab via WebContainers — full npm installs and Vite dev servers with no remote VM. Free for public projects.
Why we recommend StackBlitz
StackBlitz's WebContainers are a genuine technical breakthrough: an entire Node.js runtime compiled to WebAssembly, so npm install and a dev server run inside your browser tab — no remote VM to queue for, boot in milliseconds, keep working offline once loaded. It is why most modern framework docs (Angular, Nuxt, SvelteKit) embed StackBlitz as their official playground.
Best use cases
Best for: opening a framework reproduction in one click from a GitHub issue template, trying a library against a real bundler without polluting your machine, live-coding demos where a cold remote IDE would stall, and sharing a full running project as a URL.
Honest limitations
WebContainers only run Node — Python, databases and native binaries need their paid remote VMs. Safari support has historically lagged Chrome. Very large monorepos strain browser memory, and private projects require a paid plan.
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