Judge0 CE
Self-HostedOpen-source online code execution and judging system
Overview
Judge0 CE is an open-source, scalable online code execution and judging system for developers, educators, and coding competition organizers. It supports over 60 programming languages, offers a RESTful API for integration into LMS or coding platforms, and provides real-time execution results with detailed feedback. Deployable via Docker (single/multi-container setups) for self-hosting, it ensures data privacy and control. Features include sandboxed execution, customizable time/memory limits, and input/output testing—ideal for automating code evaluation without third-party dependencies.
Key Features
- Supports 60+ programming languages
- RESTful API for easy integration
- Secure sandboxed code execution
- Docker-based deployment for self-hosting
Frequently Asked Questions
? Is Judge0 CE hard to install?
No—Judge0 CE uses Docker for deployment. The official docs provide step-by-step guides for single-container (testing) and multi-container (production) setups, making it accessible for users with basic Docker skills.
? Is it a good alternative to HackerRank Judge?
Yes—Judge0 CE offers core code execution features but as an open-source, self-hosted solution. It’s ideal if you need data control, custom integrations, or want to avoid proprietary service lock-in.
? Is it completely free?
Judge0 CE (Community Edition) is 100% free and open-source under the MIT License. You can use, modify, and self-host it without cost. The enterprise edition (Judge0 EE) has paid advanced features.
Top Alternatives
Tool Info
Pros
- ⊕ Privacy-focused (self-hosted data control)
- ⊕ No subscription fees
- ⊕ Extensive language support
- ⊕ Customizable execution limits
Cons
- ⊖ Requires basic Docker knowledge for deployment
- ⊖ Scaling to high traffic needs additional resources
- ⊖ Lacks enterprise features like priority support