No. 19 of 30 ·Coding Challenge Platforms

NextJudge

Web · Self-hosted · API

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Freedom report

No signalScore 5.1

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedThinly documented

NextJudge is ranked #19 of 30 in coding challenge platforms on Freedom251. It runs on API, Self-hosted, Web.

Compared on coding challenge platforms

Primary use: contests
Languages supported: C++, C, Python, PyPy, Java, JavaScript, TypeScript, Go, Rust, Ruby, Lua, Kotlin, Haskell
Custom challenges: Yes

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The record

Purpose: NextJudge is an open, self-hostable platform for hosting and participating in competitive programming contests.
Code editor: Its code editor uses Monaco and provides syntax highlighting and multiple themes.
Contest tools: The platform includes live leaderboards, contest Q&A, live submissions, real-time submission feedback and activity overviews.
Language support: The maker’s homepage lists Python, JavaScript, C++, Go, Haskell, Kotlin, C#, Java, TypeScript, PHP, Swift, Rust, C, Lua and Ruby.
Execution: Judge workers compile and run submitted code in nsjail sandboxes.
API and CLI: NextJudge provides a REST API and CLI for direct access and automation.
Authentication: The setup guide supports email and password registration or GitHub sign-in when OAuth is configured.
Data control: The maker says participant data, problems and submissions are stored in PostgreSQL on infrastructure the operator controls.
Security operations: The deployment guide recommends keeping judge workers network-separated from internal admin tools and rate-limiting authentication and password-reset routes at the proxy.
Requirements: A local deployment requires Docker and Docker Compose, at least 4 GB RAM (8 GB with web and judge together), and ports 5000, 5432, 5672 and 8080 free.
Operational tradeoff: Self-hosters are responsible for operating the database, message queue, judge images, backups, monitoring and network isolation.
Support: The homepage lists [email protected] as its contact address and invites users to join a waitlist for early access.

Where it ranks on Freedom251

Best Coding Challenge Platforms in 2026#19 of 30

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Sources

nextjudge.net· checked 4 Oct 2026
docs.nextjudge.net/architecture/judge/· checked 4 Oct 2026
docs.nextjudge.net/start/intro/· checked 4 Oct 2026
docs.nextjudge.net/start/getting-started/· checked 4 Oct 2026
docs.nextjudge.net/start/principles/· checked 4 Oct 2026
docs.nextjudge.net/guides/deployment/· checked 4 Oct 2026