An online judge is an online system to test programs in programming contests. They are also used to practice for such contests like ICPC. The system can compile and execute your code, and test your code with pre-constructed data. Submitted code may be run with restrictions, including time limit, memory limit, security restriction, and so on. The output of the code will be captured by the system, and compared with the standard output. The system will then return the result.

Open source online judge based on Vue, Django and Docker. | 青岛大学开源 Online Judge | QQ群 496710125 | admin@qduoj.com

• UpdatedOct 23, 2024
• Python

Hydro - Next generation high performance online-judge platform - 新一代高效强大的信息学在线测评系统 (a.k.a. vj5)

• UpdatedNov 25, 2025
• TypeScript

Robust and scalable online code execution system.

• UpdatedNov 24, 2025
• HTML

Popular Simple Open Source Online Judge based on PHP/C++/MySQL/Linux for ACM/ICPC and NOIP training, with easy installation. 简单实用的开源OJ系统

• UpdatedNov 29, 2025
• JavaScript

⚡ The most advanced open-source automatic algorithm online judge system | 南京邮电大学开源 Online Judge | QQ群：668108264

• UpdatedMar 26, 2024
• PHP

⚡🔥Hcode Online Judge(HOJ)🔥⚡：基于SpringCloud与Vue前后端分离，分布式架构的在线测评平台OJ (An open source online judge system base on SpringBoot, Springcloud Alibaba and Vue.js !)

• UpdatedSep 24, 2025
• Java

✨ Open source online judge system (based on Microservice). SDUOJ 开源在线评测系统（基于微服务架构）。开源社区QQ群 808751832。示例网站https://demo.sduoj.com

• UpdatedJul 13, 2024
• Java

A multiple pages app built for OnlineJudge

• UpdatedApr 4, 2024
• Vue

Jiangnan Online Judge

• UpdatedJan 8, 2024
• JavaScript

Putong Online Judge -- An online judge with nothing special

• UpdatedFeb 24, 2025
• JavaScript

在线练习系统 ==> 后端：基于Gin、Redis、Gorm实现 前端：基于Vue、Element实现

• UpdatedOct 30, 2023
• Go

Holding contests using problems from other OJs!!

• UpdatedAug 15, 2016

GOJ在线评测系统

• UpdatedOct 30, 2025
• Vue

The front end of the Putong Online Judge -- An online judge with nothing special

• UpdatedOct 26, 2024
• Vue

A lightweight, high-performance, universal program judger supporting multiple languages, special judge and SQL judge.

• UpdatedDec 8, 2022
• C#

Hangzhou Normal University Online Judge

• UpdatedMar 16, 2021
• JavaScript

OnlineJudge 平台 YuJudge 的判题核心，基于 C 编写，支持在 Linux 下运行。程序基于可执行文件以及标准输入输出目录、资源限制等配置，执行并给出资源消耗情况，并能防止恶意调用。

• UpdatedMay 24, 2023
• C

The next generation judging system for Hydro (and vijos)

• UpdatedNov 8, 2020
• JavaScript

A HUSTOJ compatible Online Judge system.

• UpdatedApr 15, 2019
• PHP

Online Judge System for Shijiazhuang No.2 Middle School, based on Universal Online Judge.

• UpdatedAug 10, 2024
• PHP