Programming language: HTML
License: GNU General Public License v3.0 only
Tags: Software Development     IDE/Tools    
Latest version: v1.13.0

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Judge0 CE

Judge0 Wallpaper

[License](LICENSE) Release Stars

🔥 The most advanced open-source online code execution system in the world.

Table of Contents


Judge0 is a robust, scalable, and open-source online code execution system. You can use it to build a wide range of applications that need online code execution features. Some examples include competitive programming platforms, e-learning platforms, candidate assessment and recruitment platforms, online code editors, online IDEs, and many more.

In our research paper Robust and Scalable Online Code Execution System, we present Judge0's modern modular architecture that can be easily deployed and scaled. We study its design, comment on the various challenges in building such systems, and compare it with other available online code execution systems and online judge systems.

To see Judge0 in action, try Judge0 IDE - our free and open-source online code editor.

Easily integrate online code editor with code execution (a.k.a. online compiler) to your website with our embeddable web widgets.


  • Quick and easy installation
  • Rich and verbose API documentation
  • Scalable architecture
  • Sandboxed compilation and execution
  • Support for 60+ languages
  • Compilation and execution of multi-file programs
  • Support for additional files alongside the user's program
  • Support for custom user-defined compiler options, command-line arguments, and time and memory limits
  • Detailed execution results
  • Webhooks (HTTP callbacks)

For more information about these and other features, please read the documentation.

Get Started

Feel free to start with the FREE Basic Plan on RapidAPI or host it yourself.

You can find our detailed plans and pricing here.

Why should you use Judge0 on RapidAPI?

Our infrastructure allows you to focus on building your product and forget about the know-how of maintaining and scaling Judge0.

RapidAPI plans are not (good) enough for you?

Let's talk. Contact us.


Judge0 comes in two flavors: Judge0 CE and Judge0 Extra CE. They differ mostly in the supported languages.

You can find the source code for Judge0 CE on the master branch, while you can find the source code for Judge0 Extra CE on the extra branch.

Judge0 Extra CE is also available on RapidAPI.

Supported Languages

Judge0 comes in two flavors: Judge0 CE and Judge0 Extra CE. They differ mostly in the supported languages.

Judge0 CE

Click here to expand the list # Name 1 Assembly (NASM 2.14.02) 2 Bash (5.0.0) 3 Basic (FBC 1.07.1) 4 C (Clang 7.0.1) 5 C (GCC 7.4.0) 6 C (GCC 8.3.0) 7 C (GCC 9.2.0) 8 C# (Mono 9 C++ (Clang 7.0.1) 10 C++ (GCC 7.4.0) 11 C++ (GCC 8.3.0) 12 C++ (GCC 9.2.0) 13 Clojure (1.10.1) 14 COBOL (GnuCOBOL 2.2) 15 Common Lisp (SBCL 2.0.0) 16 D (DMD 2.089.1) 17 Elixir (1.9.4) 18 Erlang (OTP 22.2) 19 Executable 20 F# (.NET Core SDK 3.1.202) 21 Fortran (GFortran 9.2.0) 22 Go (1.13.5) 23 Groovy (3.0.3) 24 Haskell (GHC 8.8.1) 25 Java (OpenJDK 13.0.1) 26 JavaScript (Node.js 12.14.0) 27 Kotlin (1.3.70) 28 Lua (5.3.5) 29 Objective-C (Clang 7.0.1) 30 OCaml (4.09.0) 31 Octave (5.1.0) 32 Pascal (FPC 3.0.4) 33 Perl (5.28.1) 34 PHP (7.4.1) 35 Plain Text 36 Prolog (GNU Prolog 1.4.5) 37 Python (2.7.17) 38 Python (3.8.1) 39 R (4.0.0) 40 Ruby (2.7.0) 41 Rust (1.40.0) 42 Scala (2.13.2) 43 SQL (SQLite 3.27.2) 44 Swift (5.2.3) 45 TypeScript (3.7.4) 46 Visual Basic.Net (vbnc

Judge0 Extra CE

Click here to expand the list # Name 1 Bosque (latest) 2 C (Clang 10.0.1) 3 C (Clang 9.0.1) 4 C# (.NET Core SDK 3.1.302) 5 C# (Mono 6 C# Test (.NET Core SDK 3.1.302, NUnit 3.12.0) 7 C++ (Clang 10.0.1) 8 C++ (Clang 9.0.1) 9 C++ Test (Clang 10.0.1, Google Test 1.8.1) 10 C++ Test (GCC 8.4.0, Google Test 1.8.1) 11 C3 (latest) 12 F# (.NET Core SDK 3.1.302) 13 Java (OpenJDK 14.0.1) 14 Java Test (OpenJDK 14.0.1, JUnit Platform Console Standalone 1.6.2) 15 MPI (OpenRTE 3.1.3) with C (GCC 8.4.0) 16 MPI (OpenRTE 3.1.3) with C++ (GCC 8.4.0) 17 MPI (OpenRTE 3.1.3) with Python (3.7.7) 18 Nim (stable) 19 Python for ML (3.7.7) 20 Visual Basic.Net (vbnc


Companies, Organizations, and Projects

These companies, organizations, and projects successfully use Judge0.

Click here to expand the list Adzetech AlgoDaily AlgoLadder Ask To How Brilliant Hire CODE.IN Code Compiler Lite - online mobile code compiler for Android Code4You CodeChum CodeClimbers Code Forum CodeInn CodeManiacs - an online judge for IIT Mandi CodeRunner Codesites Codify DevCoach Dilla University Filtered GeekCoders Georg-August University of Göttingen GoMyCode Hackademy Heimdall Indian Institute of Technology Mandi Instacks Institute of Aeronautical Engineering Interview Sandbox JavaJudge0Api - a Java library for interacting with Judge0 Judge Code Online KPR Institute of Engineering and Technology KodKarate - an open-source IDE KodNest MartyMiniac/Autorun MyEduKit NewsCad Newton School Picode - an online code playground Pravinkanna/codeaholic PrepForTech REVA University Soft CodeOn SparkDatabox StarOJ - An online judge platform based on Judge0 StardustDL/judge0-dotnet - Client SDK for Judge0 Stemalica Studyfied Techie Delight Think exam ThinkingBell University of Zagreb, Faculty of Electrical Engineering and Computing VS Code App - lightweight universal IDE for iOS / iPadOS with full iCloud Drive support Xiith anu0912/online-code-editor judge0-gem - Ruby Gem for interacting with Judge0 judge0_helm - Helm Chart for Judge0 judge0api - Python library for interacting with Judge0 muzam1l/ide nGrader primat.org tracyliu1220/Mini-OJ uDebug Tool wkspace yoCode Zbirka Online

Scientific Articles

These scientific articles use or mention Judge0.

Click here to expand the list A Game-Changing Instructor Tool to Reinforce Coding Concepts Building a Comprehensive Automated Programming Assessment System Voice-Enabled Intelligent IDE in Cloud

Other Online References

Click here to expand the list Designing Online Judge or Leetcode Make your own online compiler in React Programski jezik Go - FER 2019./2020. - Prvo predavanje Sudjelovanje FER-a na Smotri Sveučilišta 2019. Svečana 672. sjednica Fakultetskog vijeća FER-a USACO Guide - Running Code Online Web application for authoring and sharing code snippets in different programming languages Let’s Deploy our Online Code Executor in Google Cloud Let’s Develop an Online Code Editor & Compiler like HackerRank Let’s Develop An Online Code Editor/Compiler Like HackerRank


Do you have a question, feature request, or something else on your mind? Or you want to follow Judge0 news?

Author and Contributors

Judge0 was created and is maintained by Herman Zvonimir Došilović.

Thanks a lot to all contributors for their contributions to this project.


You can find the detailed specification of changes between versions in [CHANGELOG.md](CHANGELOG.md).

Special Thanks

Special thanks to open-source projects without whom Judge0 probably wouldn't exist: Isolate, Docker, Ruby on Rails and others.


Thanks a lot to all Patrons and PayPal donors that support Judge0 development. Thank you! ♥


Your are more than welcome to support Judge0 development on Patreon, via PayPal or Revolut. Thank you.


Judge0 is licensed under the [GNU General Public License v3.0](LICENSE).

*Note that all licence references and agreements mentioned in the Judge0 API README section above are relevant to that project's source code only.