Built to remove every
reason not to code.

What is CodeStudio?

CodeStudio is a complete integrated development environment that runs entirely inside your web browser. It gives you a code editor on one side of the screen and a live rendering of your output on the other — updating in real time as you type, with no save button required.

It supports HTML, CSS, and JavaScript — the three languages that power the web. Whether you're building a personal webpage, experimenting with CSS animations, writing a JavaScript algorithm, or prototyping an interactive UI, CodeStudio handles it all in one tab.

Why we built it

The barrier between having an idea and turning it into working code shouldn't be "install Node.js, configure Webpack, learn the terminal." For students, designers, and people just getting started, those setup steps can be the thing that stops them before they've written a single line.

CodeStudio exists to eliminate that barrier. Open a tab, and you're already inside a fully equipped development environment. The editor is there. The preview is there. The AI assistant is there. Nothing stands between you and the work.

Who uses CodeStudio?

CodeStudio is designed for a wide range of people:

• Students learning web development — no need to ask for help setting up an environment before the first lesson.
• Designers who want to prototype in real code, not mockup tools that approximate what a browser would render.
• Developers who need a quick sandbox to test a snippet, reproduce a bug, or share a working example with a colleague.
• Educators who want all their students to be in the same environment, regardless of their operating system or technical background.
• Hobbyists building small projects for the love of building things.

What makes it different?

There are other browser-based editors. CodeStudio distinguishes itself in a few specific ways:

• Real-time collaboration — share a link and code together live, cursors and all, without any sign-up.
• Built-in AI assistance — when you're stuck, an AI assistant is one click away, right inside the editor.
• Zero-friction start — no required account, no onboarding screens, no tutorial you have to skip.
• Persistent storage — your work saves to the browser automatically, and to an account if you want it accessible from anywhere.
• Export anytime — your code is always yours; download the full project as a ZIP file whenever you're ready to move it elsewhere.

The technology behind it

CodeStudio is itself a web application — HTML, CSS, and JavaScript running in a browser, building a tool for writing HTML, CSS, and JavaScript in a browser. The editor uses industry-standard syntax highlighting and autocomplete libraries. The live preview runs your code in a sandboxed iframe that updates with every keystroke. The AI assistance is powered by Google Gemini, integrated directly into the editing experience.

Collaboration is built on peer-to-peer technology, so you and a collaborator can edit the same file simultaneously with sub-second latency — no server in the middle relaying your keystrokes.

Completely free

CodeStudio is free to use. There is no paid tier, no feature locked behind a paywall, and no time limit on your session. We believe access to tools for learning and building should not be gated by a subscription.