# Judge0

Robust, fast, scalable, and sandboxed open-source online code execution system for humans and AI.

Repository: https://github.com/judge0/judge0
Canonical: https://ross.abutalabs.com/products/judge0
Homepage: https://judge0.com
Language: HTML
License: GPL-3.0
License Family: copyleft
Topics: online-judge, online-compiler, competitive-programming, code-executor, code-runner, code-execution, onlinejudge, online-judges, onlinejudge-solution, ai-agents, ai-tools, ai-agent-tools
Last push: 2026-08-17T11:05:41+00:00
Link (homepage): https://judge0.com
Link (site_page): https://ce.judge0.com

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 8, longevity 100
- inputs: {"age_days": 3505, "days_push": 16, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4401, forks 926 (observed 2026-08-28T04:08:48.262016+00:00)

## What it is
Judge0 is an open-source, sandboxed online code execution system exposing a simple HTTP JSON API for compiling and running untrusted code in 60+ programming languages. It can be self-hosted or used as a managed SaaS, and powers applications like online judges, IDEs, e-learning platforms, and AI agent code execution.

## Use cases
- run untrusted user-submitted code safely in a sandbox
- build a competitive programming or online judge platform
- execute AI-generated code from agents
- power an online code editor or IDE in the browser
- run coding assessments for recruitment
- execute code for e-learning and teaching platforms

## When to choose
- you need scalable, sandboxed execution of code in many languages via an API
- you want a self-hostable online judge or code execution backend
- you need to run AI-generated code safely
- you want detailed execution results, custom limits, and webhooks

## When to avoid
- you only need to run trusted code in a single language locally
- you need a full-featured IDE experience rather than an execution API
- you cannot run Docker/isolation infrastructure and don't want a hosted service

## Facets
- artifact type: service
- maturity: active
- function: http-server, api-framework, security, developer-tools
- domain: developer-tools, education, apis, artificial-intelligence
- platform: self-hosted, cloud
- tags: online-judge, code-execution, sandbox, competitive-programming, code-runner, ai-agents, online-ide, linux, docker, web-server

## Member repositories
- judge0/judge0 (main) score 67
- judge0/ide (frontend) score 51

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:48.262016+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:21:08.094658+00:00, confidence not recorded.
  - readme: https://github.com/judge0/judge0 (fetched 2026-08-28T04:08:48.262016+00:00, sha dbcfe95eb5b2)
  - homepage: https://judge0.com (fetched 2026-08-29T09:09:19.414250+00:00, sha 4b571d8cae37)
  - site_page: https://ce.judge0.com (fetched 2026-08-29T09:09:19.423420+00:00, sha 85abcf1cffd6)
- Data as of 2026-08-30T08:39:29.467469+00:00.