Judge0
Sandboxed code execution system for running untrusted code from people and AI.
Updated
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Use cases
About Judge0
Judge0 is listed in our sandboxes & code execution category and is aimed at builders. Sandboxed code execution system for running untrusted code from people and AI. Pricing, as the maker states it: Open source + cloud. Maturity: Active. We last checked the official link on 2026-10-16.
What is Judge0?
Judge0 is a robust, scalable, sandboxed open-source online code execution system for humans and AI. It can power applications such as AI agents that need to run code.
A hosted option is available alongside the open-source system.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: judge0.com.
Who is Judge0 for?
Developers who need to run untrusted code from users or agents safely.
Judge0 at a glance
- Open source: Yes (GNU GPL v3.0)
- GitHub: judge0/judge0 · 4,492 stars (as of Oct 21, 2026)
Key features
- Sandboxed code execution
- Scalable
- Open source plus cloud
Judge0 FAQ
What is Judge0?
Judge0 is a robust, scalable, sandboxed open-source online code execution system for humans and AI. It can power applications such as AI agents that need to run code.
Who is Judge0 for?
Developers who need to run untrusted code from users or agents safely.
Is Judge0 free?
Judge0's pricing, as the maker states it: Open source + cloud. Open-source tools are free to use, though you may still pay for model API usage or a hosted plan. Check the official site for current plans.
Is Judge0 open source?
Yes. Judge0 is released under the GNU GPL v3.0, according to its GitHub repository.
What are alternatives to Judge0?
Similar tools include CubeSandbox, microsandbox, Agent Sandbox (Kubernetes), BoxLite, smolvm and ArcBox.
Judge0 ratings and reviews
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Judge0 alternatives
Other sandboxes & code execution tools in our directory. See all sandboxes & code execution tools →
CubeSandbox
Lightweight, concurrent sandbox for running AI agent code securely.
microsandbox
Local-first microVM runtime for running untrusted agent code safely.
Agent Sandbox (Kubernetes)
A Kubernetes project that adds a Sandbox resource for running isolated, stateful agent workloads such as code execution and browsers, with warm pools and fast startup on your own cluster.
BoxLite
Embeddable micro-VM for running AI agents.
smolvm
Portable, branchable virtual machine for running agents safely on your computer.
ArcBox
Runs AI agents on isolated machines with their own kernel, filesystem and network.
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