Pocket Compiler

Cosmovex / Apps / Pocket Compiler

On Android and iPhone

Pocket Compiler: Run Code

Run code on your phone. Offline.

Pocket Compiler: Run Code is a code editor and compiler for Android and iPhone. Write code or open a file, tap ▶ Run, and see the output, or the error and the line it came from. Python, JavaScript, React, HTML and SQL run offline on the phone; on Android, so do Java, C, C++ and PHP.

Get it onGoogle PlayDownload on theApp Store

1K+ installs on Google Play · No account · Your code stays on your phone

main.py▶ Run

Code P2: real code from the video, ready to run.

print(0.1 + 0.2)print(0.1 + 0.2 == 0.3) import mathprint(math.isclose(0.1 + 0.2, 0.3))
Python · finished
0.30000000000000004
False
True

What runs, and where

Every language below runs on the phone itself, not on a server.

Languages in Pocket Compiler: Run Code
LanguageAndroidiPhone / iPadHow it runs
Python✓✓Offline from install. numpy, pandas and other packages from a requirements.txt.
JavaScript + React✓✓JavaScript offline from install, with console output; React is a one-time download.
HTML + CSS✓✓Opens as a live page, with its CSS and script.
SQL (SQLite)✓✓A real SQLite database on the phone; results show as a table.
Java✓Android onlyOne-time download, then offline.
C✓Android onlyOne-time download, then offline.
C++✓Android onlyOne-time download, then offline.
PHP✓Android onlyOne-time download, then offline.

Saw a code in a Short? Type it.

Every Pocket Compiler video on YouTube shows a short code, like AI2. Type it in the app and that program opens, ready to run, with a step-by-step “How it works”. Every video code can be seen, run and copied.

All 41 codes in the Code Library

Phone AI (no libraries)

Build an AI from scratch, on your phone

Games on your phone

Real games, no laptop

Python traps

Code that surprises everyone

JavaScript traps

The weird parts, explained

Java traps

Why Java does that

SQL traps

Queries that lie

🧩 Fix it challenges

A broken file. Can you fix it?

Pocket Compiler can do THAT?

Real tools, running on your phone

GitHub and a terminal, in your pocket

  • Browse any public repository. The Code tab shows its languages and whether it runs here.
  • Clone it and run it. Sign in with GitHub to save a file as a Gist or to a repository.
  • A real terminal. git, python, node and sqlite3, plus everyday commands like ls and cat. SSH into your own server.

On iPhone, GitHub and the terminal arrive with version 2.1.

~$ git clone https://github.com/octocat/Hello-World
Cloning into 'Hello-World'... done.
~$ cd Hello-World
~/Hello-World$ python -c "print(sum(range(101)))"
5050
~/Hello-World$ node -e "console.log([1,2,3].map(x=>x*2))"
[ 2, 4, 6 ]
~/Hello-World$ 
# requirements.txt
numpy
pandas
colorama
✓ numpy installed
✓ pandas installed
✓ colorama installed

Python packages from a requirements.txt

Install the packages a project lists: pure-Python packages plus numpy, pandas and other supported ones on Android (pure-Python packages on iPhone). A package is one download, then it stays on the phone.

Code NP1 solves three equations with np.linalg.solve, on the phone.

See it

  • Type the code from a Short, like AI2, and the program opens ready to runType the code from a Short, like AI2, and the program opens ready to run
  • A Python program and its output, run offline on the phoneA Python program and its output, run offline on the phone
  • A GitHub repository with its languages and a Clone buttonA GitHub repository with its languages and a Clone button
  • The built-in terminal running git clone, git log and pythonThe built-in terminal running git clone, git log and python
  • numpy, pandas and colorama installed from a requirements.txtnumpy, pandas and colorama installed from a requirements.txt
  • A Java program compiled and run on the phoneA Java program compiled and run on the phone
  • A video code explained step by step in How it worksA video code explained step by step in How it works
  • COSMO AI: explain this file, fix the last error, write code from a promptCOSMO AI: explain this file, fix the last error, write code from a prompt

✨ COSMO AI, when you want it

Ask COSMO AI to explain a piece of code or fix an error, right in the editor. It is optional, for users 18+, uses COSMO credits, and is on Android only.

🔒 Private by design

Your code is stored and run on your device. With COSMO AI, only what you choose to send goes to Google's Gemini API; prompts and answers are not kept and never train AI models. Git sign-ins stay in secure storage. Privacy policy

📂 Opens any code or text file

Tap “Open with” in a file manager, downloads or chat app. .py, .js, .html, .sql, .c, .cpp, .java, .php, plus TXT, LOG, JSON, XML, YAML, CSV, Markdown and shell files. JSON, YAML and XML can be formatted and validated.

How it compares

Each app does some things the others don't. This table sticks to what each one is built for; check each store listing for the details.

Pocket CompilerPydroid 3TermuxReplit
PlatformsAndroid, iPhone, iPadAndroidAndroidWeb, Android, iPhone
Runs code on the phone, offlineYesYesYesNo, runs in the cloud
LanguagesPython, JavaScript, React, HTML, SQL, Java, C, C++, PHPPythonWhatever you install with pkgMany
Tap Run, no setupYesYesNo, command lineYes
Account neededNoNoNoYes
GitHub clone + terminalYesTerminalYes (git via pkg)Yes

Pick Pydroid 3 for a Python-only IDE, Termux for a full Linux command line, Replit for cloud projects you share. Pick Pocket Compiler to run several languages on the phone with one Run button, offline, without an account.

Questions

What is Pocket Compiler: Run Code?

Pocket Compiler: Run Code is a code editor and compiler app for Android and iPhone made by Cosmovex. You write code or open a file, tap Run, and see the output, or the error and the line it came from. Python, JavaScript, HTML and SQL run offline on the phone; React runs too, and on Android so do Java, C, C++ and PHP.

Does it work offline?

Yes. Python, JavaScript, HTML and SQL run offline from the moment you install. Java, C, C++, PHP and React are each a one-time download (internet needed once), then they run offline. GitHub, package installs, SSH and COSMO AI need a connection.

Is it free?

Free to download; some features are part of an optional upgrade.

Can I install Python packages like numpy and pandas?

On Android, yes: install the packages in a requirements.txt, pure-Python packages plus numpy, pandas and other supported ones. On iPhone, pure-Python packages from a requirements.txt are supported.

Can it compile C and C++ on Android?

Yes. C and C++ are a one-time download and then compile and run offline on the phone, with program input (scanf, cin) and errors that point to the line. C, C++ and PHP are not available on iPhone.

Can I run a GitHub repository on my phone?

Yes. Browse any public repository, see its languages and whether it runs here, then clone it and run it. The built-in terminal has git, python, node and sqlite3. On iPhone this arrives with version 2.1.

What are the codes in the YouTube Shorts?

Every Pocket Compiler Short shows a short code, like AI1 or P2. Type it in the app and that program opens, ready to run, with a step-by-step "How it works". Every video code can be seen, run and copied.

Do I need an account? Is my code uploaded?

No account is needed. Your code is stored and run on your device. Only when you choose COSMO AI is what you send passed to Google's Gemini API; prompts and answers are not kept and are never used to train AI models. Git sign-ins stay in the device's secure storage.

Which languages work on iPhone and iPad?

Python, JavaScript, React, HTML and SQL, offline. Java, C, C++ and PHP are Android only, and so is COSMO AI.

Pocket Compiler icon

Write it, tap Run, see what it does.

Your code stays on your phone.

Get it onGoogle PlayDownload on theApp Store