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A modern open-source online judge and contest platform system.

Python ◇ online-judge AGPL-3.0
★231STARS
⑂122FORKS
!67ISSUES
🏆#9,594GLOBAL RANK
🔥2DAYS TRENDING
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Momentum

+10

STARS · LAST 30 DAYS

1

PER DAY

#1,187

MOST-STARRED Python

Window7 days30 days90 days
Stars gained+7+10+90
Per day111
Forks gained+1+3+10

OJ gained 10 stars in the last 30 days, about 1 a day, and now has 231. It is about 6 years old and has averaged roughly 39 stars a year. It ranks #1,187 among Python repositories and #9,594 across all languages on GitHubRepo.

Trending Record

OJ has maintained a continuous presence across global trending indexes, peaking at #8999. Below is the 30-day activity profile:

💡 Overview

OJ is an open-source project written in Python: A modern open-source online judge and contest platform system. .

Engineered for speed, consistency, and developer ease, it solves common hurdles in online-judge. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.

⚡ Key Features

1

Optimized execution pipeline written in Python for predictable speed.

2

Zero-friction configuration with comprehensive sensible defaults out of the box.

3

Cross-platform runtime support across Linux, macOS, and Windows environments.

4

Strong typing and modular architecture designed for easy extension and maintainability.

5

Standardized CLI and API interfaces for smooth integration into CI/CD workflows.

6

Active community maintenance with regular dependency updates and security patches.

📥 Installation

terminal
$ pip install OJ

⚙ System Requirements

Platforms

  • • macOS
  • • Linux
  • • Windows

Runtime & Dependencies

Python >= 3.9, pip, virtualenv

Architecture

x86_64, ARM64 (Apple Silicon & Graviton)

🧠 How It Works

OJ coordinates its core functionality through a modular Python pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.

🎯 Production Use Cases

Production System Integration

Embed OJ into Python backend services to handle core application logic.

CI/CD Automated Pipelines

Run automated validation, builds, and integration suites during deployments.

Developer Tooling & Workflows

Accelerate developer onboarding with pre-configured project utilities.

Open Source Extension

Fork and customize internal modules under the repository's open AGPL-3.0 license.

🚀 Getting Started

1

Install OJ using your package manager: `pip install OJ`

2

Initialize your project workspace or configuration file for OJ.

3

Import OJ into your codebase or invoke it directly from your terminal.

4

Execute your test suite or run `OJ --help` to verify successful setup.

👍 Strengths

Active community backing with 231 GitHub stars and verified adoption.
Permissive open-source distribution under the AGPL-3.0 license.
Built in Python for high execution speed and developer familiarity.
Cross-platform compatibility across modern Linux, macOS, and Windows environments.
Clean modular design allowing flexible configuration and pipeline integration.

⚠️ Considerations

Requires familiarity with Python and modern CLI workflows.
Ecosystem extensions may require manual configuration depending on environment constraints.
Active development roadmap means breaking API changes may occur across major versions.

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👥 Who Should Use This

Developers and engineering teams building with Python, seeking reliable, tested, and actively maintained tooling for production workloads.

🏆 Nearby in the Rankings

VNOI-Admin/OJ is currently ranked #9,594 by stars across every repository tracked on GitHubRepo. These are adjacent projects:

RankRepositoryLanguageStarsAction
#9,580 third-culture-software/bhima JavaScript ★ 232 Compare ↗
#9,580 puppetlabs/puppetlabs-postgresql Ruby ★ 232 Compare ↗
#9,580 fabiomcosta/jquery-meiomask JavaScript ★ 232 Compare ↗
#9,580 receptron/mulmoterminal TypeScript ★ 232 Compare ↗
#9,580 MotleyAI/slayer Python ★ 232 Compare ↗
#9,594 VNOI-Admin/OJ This Project Python ★ 231
#9,594 matthew-kissinger/kiln TypeScript ★ 231 Compare ↗
#9,594 southleft/story-ui TypeScript ★ 231 Compare ↗
#9,594 loadingalias/cargo-rail Rust ★ 231 Compare ↗
#9,594 DataSQRL/sqrl Java ★ 231 Compare ↗
#9,594 LAA-Software-Engineering/golang-rest-api-template Go ★ 231 Compare ↗

Frequently Asked Questions

What does OJ do? +

A modern open-source online judge and contest platform system.

What language is OJ written in? +

The primary language is Python. Topics include: online-judge.

Is OJ actively maintained? +

Yes, the last recorded push was on Oct 6, 2026 with 67 open issues being tracked.

How many stars does OJ have? +

OJ has 231 stars and 122 forks on GitHub.

How does OJ rank among GitHub repositories? +

With 231 stars, VNOI-Admin/OJ is ranked #9,594 globally across all repositories tracked on GitHubRepo and #1,187 among Python projects.

What license is OJ distributed under? +

The repository reports a AGPL-3.0 license. Always verify the repository LICENSE file for legal terms.

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