Codeground AI

Mojo Online Compiler

Write Mojo, press Run, see stdout. Experiment with Modular’s systems/AI language without installing the SDK locally.

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It will inspect your code, think, and propose changes you can Keep or Discard inline.

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Python

About this editor

Write Mojo, press Run, see stdout. Experiment with Modular’s systems/AI language without installing the SDK locally.

Use this Mojo playground for syntax drills, small kernels, and comparing Python-like productivity with systems performance. Save a snippet when you want a shareable link.

Key features

Mojo runs server-side

mojo run executes your .mojo entry file in an isolated container.

One-click Run

Output, stderr, and compiler errors land in the panel below. No local install.

VS Code–like editor

Syntax highlighting, bracket matching, and shortcuts that feel familiar if you use VS Code.

Shareable links

Save with a title and copy the URL — handy for reviews, homework, or interview screens.

No setup

Open the page and start typing. Account optional for basic runs.

Room to grow

Need multiple files? Open a cloud workspace from the top bar.

Getting started

  1. 1
    Write your code

    Type or paste Mojo in the editor. A starter template is there if you want to run something immediately.

  2. 2
    Press Run

    Check the output panel underneath for results or errors.

  3. 3
    Edit and rerun

    Change a line, run again. Most people loop here until the output looks right.

  4. 4
    Save for a permalink

    Add a title when you save. You get a link you can send to a teammate or drop in a doc.

  5. 5
    Bigger project?

    Cloud workspaces handle multi-file repos and longer sessions. Link is in the top nav.

Common questions

Is this Mojo compiler free?

Yes. No payment and no account required for a quick run. Sign in if you want saves tied to your profile.

Do I need to install anything?

No. Code runs on Codeground servers in a sandbox. Just open the page.

What Mojo version runs here?

Mojo SDK in a sandbox (when the image is built with Modular auth).

Can I share my code?

Save with a title to get a permalink, or share the playground URL as-is.

Works for interviews?

Yes. Share a ground link, or use interview mode for a live shared editor.

Multiple files?

This page is for single-file snippets. Use a cloud workspace for full projects.

Will my code still be here tomorrow?

Anonymous sessions can reset. Save with a title (and sign in) for a stable link.

Why use this instead of installing locally?

Good for quick tests, learning, and sharing a snippet. For large offline work, a local IDE still wins.

Is this an online Mojo IDE or playground?

A browser playground with syntax highlighting and one-click Run — run Mojo online without a full local install. Cloud workspaces cover multi-file projects.

Is there a free Mojo playground?

Yes — Codeground hosts a Mojo online compiler so you can try the language in the browser.

Mojo vs Python?

Mojo aims for Python-like ergonomics with systems/AI performance. Use the Python ground for classic scripts; open Mojo when you want Modular’s toolchain.