OneCompiler is an online compiler, code editor and code runner for 150+ programming languages, frameworks and databases, plus an AI app builder that turns a prompt into a working app or website. Your code runs on our cloud servers, not on your phone, so there is nothing to install or configure.

RUN CODE IN 150+ LANGUAGES

Use OneCompiler as your Java compiler, Python compiler, C and C++ compiler, JavaScript and Node.js runner, HTML compiler or SQL compiler. Languages include Java, Python, C, C++, C#, JavaScript, TypeScript, Kotlin, Go, Rust, Swift, Dart, PHP, Ruby, Perl, R, Scala, Haskell, Lua, Bash, Assembly, Fortran, Cobol and many more.

Query MySQL, PostgreSQL, SQLite, MongoDB, Oracle, SQL Server and Redis. Preview HTML, CSS, React, Vue and Angular live. Run web servers like Flask, Django, FastAPI, Express, Spring Boot and Next.js, and GUI programs like Tkinter, Pygame and Java Swing, right inside the app.

BUILD APPS AND WEBSITES WITH AI

Describe what you want in plain English, and the AI app builder writes the code. Chat to refine it, preview it live, and publish it to a shareable URL with hosting built in. Design screens with AI too. AI-generated code is a starting point, so review it before you ship.

AN AI ASSISTANT IN YOUR EDITOR

Ask the assistant to explain an error, fix a bug or add a feature. It edits your files directly, shows a line-by-line diff of every change, and lets you undo with one tap.

A REAL CODE EDITOR ON YOUR PHONE

OneCompiler is a full mobile IDE, built for coding on a small screen. Practice programming on the bus, finish an assignment without a laptop, or test a quick snippet anywhere. Because your code compiles in the cloud, nothing slows your phone down or fills up its storage.

- Syntax highlighting for every language
- Autocomplete for keywords, your own variables and common snippets
- Multi-file projects with a file explorer, or run a single file
- Standard input (STDIN) for programs that read user input
- Drafts save automatically, so you can pick up where you left off
- Light and dark themes
- Code and output side by side on tablets, foldables and Chromebooks
- Share your code and its output in a tap

LEARN AND PRACTICE

Follow courses with guided lessons, join your teacher's classroom for updates, tests, labs and materials, and practice coding interviews with the AI Interviewer.

WHO USES ONECOMPILER

Students running programming assignments without a laptop. Candidates preparing for coding interviews and placement tests. Developers testing a snippet on the move. Beginners learning their first programming language. Teachers sharing runnable examples with a class.

If you have ever needed to run a piece of code and had only your phone with you, OneCompiler is built for you.

OneCompiler is free to use. Optional plans add more daily AI credits for the AI app builder and assistant.

Download OneCompiler and start coding today.