Judge0 is a robust and scalable open-source online code execution system.

Judge0 can help you build wide range of applications varying from competitive programming platforms, educational and recruitment platforms, to online code editors and more.

To see Judge0 in action, try Judge0 IDE - free and open-source code editor that uses Judge0 for executing the user’s source code.

• Quick and easy installation.
• Supports more than 60 languages.
• Runs programs in a secure and reliable sandbox.
• Send additional files alongside your single-file program. Demo.
• Compile and run multi-file program.
• Set custom compiler options. Demo.
• Set custom command line arguments. Demo.
• Set time and memory limits.
• HTTP callbacks.
• And many more.

For more information visit https://api.judge0.com.

You can read a research paper about Judge0 here.

or deploy on your server.

These companies, organizations and projects successfully use Judge0 in production:

• Adzetech
• AlgoDaily
• AlgoLadder
• Ask To How
• Brilliant Hire
• CODE.IN
• Code Compiler Lite - online mobile code compiler for Android
• Code4You
• CodeChum
• CodeClimbers
• CodeForum.ORG
• CodeInn
• CodeManiacs - an online judge for IIT Mandi
• CodeRunner
• Codesites
• Codify
• DevCoach
• Dilla University
• Filtered
• GeekCoders
• Georg-August University of Göttingen
• GoMyCode
• 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

Feel free to add yours to the list by sending me an email or creating an issue.

Do you have a question, feature request or something else on your mind? Or you just want to follow Judge0 news? Check out these links:

• Subscribe to Judge0 newsletter
• Join a Discord server
• Watch asciicasts
• Report an issue
• Contact the author
• Get free online support
• Schedule an online meeting with the author

Judge0 was created by Herman Zvonimir Došilović.

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

Detailed specification of changes between versions can be found in CHANGELOG.md.

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

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

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

Judge0 is licensed under the GNU General Public License v3.0.