About LinuxSim

What it is

LinuxSim is a complete simulation of a Linux desktop that runs entirely in your web browser. You get a file manager, a terminal with 75+ working commands, a real Python 3 interpreter, a text editor, a system monitor, and a virtual filesystem that persists across sessions. Everything responds like a real Linux system — but nothing you do can affect your real computer.

Why it exists

The hardest part of learning Linux isn't the commands — it's the fear of breaking something. People try to learn on their main computer, get scared they'll delete the wrong file, and give up. Or they spend 30 minutes installing a virtual machine before they can type their first ls. Or they use a tiny online terminal that times out in 5 minutes.

LinuxSim removes every one of those obstacles. You visit the site, the desktop loads in under a second, you open a terminal, and you start typing. Everything is saved in your browser, so you can close the tab and come back a week later and your files are still there. You can run rm -rf / and nothing will break. Your CPU and RAM are used for the simulation — no server-side sessions to time out — so you can use it as long as you want, for free, forever.

What's real and what's simulated

The filesystem, the shell, the ls output — those are all JavaScript pretending to be Linux. Every command has been handwritten to respond the way a real Linux system would. This is a simulation, not an emulation — no kernel is running, no virtualization is happening. The trade-off: it's instant and lightweight and runs on a phone, but the edges don't match reality perfectly.

What is real: the Python 3 REPL. When you open a Python window, you're running actual CPython compiled to WebAssembly via Pyodide. import numpy works. import math works. You can write real programs that compute real answers. That's not simulated at all.

Who it's for

• Beginners who want to practice Linux commands without a VM or dual-boot
• Students working through a Linux course and wanting a sandbox for the exercises
• Teachers who need a zero-setup way to give students hands-on Linux access
• Windows users curious what all the fuss is about but not ready to install anything
• Anyone who needs to look up a command and try it right away

What's next

LinuxSim is under active development. On the roadmap:

• Real SQLite via sql.js — a Database Browser that actually runs SQL
• Syntax highlighting in the text editor via CodeMirror
• Real git operations via isomorphic-git
• More interactive labs based on real teaching material
• Themes for different Linux distributions once we have partnerships in place
• Embedded mode for use inside online Linux courses

Connected to Apex Online Academy

LinuxSim is a companion tool for the Linux Essentials course at Apex Online Academy — a 22-module, 66-lesson textbook-quality course that teaches Linux from zero to system administrator. The labs shown on our Labs page come from that course, and the sim is designed so students can do every exercise without leaving their browser.

Privacy

LinuxSim doesn't have accounts. It doesn't require an email. It doesn't track you individually. The only state it stores is your virtual filesystem and settings, kept in IndexedDB in your own browser — never sent anywhere. Clearing your browser data wipes everything.

We use Cloudflare for the CDN and SSL. Cloudflare may log anonymized traffic data as part of normal operation.

Trademarks

LinuxSim is an original simulation. It is not affiliated with, endorsed by, or derived from Canonical Ltd, Red Hat, System76, Linux Mint, OffSec, Software in the Public Interest, or any other Linux distribution or company. The visual theme is inspired by Ubuntu but uses original artwork and branding.

"Linux®" is a registered trademark of Linus Torvalds. "Ubuntu®" is a registered trademark of Canonical Ltd. All other names mentioned on this site are trademarks of their respective owners.