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Online-judge Alternatives
Similar projects and alternatives to online-judge
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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adventofcode
Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 and 2025 in Scala (by sim642)
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LeetCode
Discontinued This is my LeetCode solutions for all 2000+ problems, mainly written in C++ or Python. (by lyhsieh)
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lovelace-engine
🚜 Automated and secure testing of code submissions in multiple languages for Project Lovelace.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better online-judge alternative or higher similarity.
online-judge discussion
online-judge reviews and mentions
Posts with mentions or reviews of online-judge.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-05-12.
- DMOJ
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How should I prepare for Cs post?
For CS, you'll have a headstart if you have a bit of experience with Python and problem-solving. Search around for basic material on Python and if you have the time, attempt some problems on https://dmoj.ca/.
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What sorts of projects have you been working on?
dmoj.ca ! It's meant more so for competitive coding but some of the problem sets they have fall under the Cryptography category.
- [Learn Programming] Liste des sites Web de défis de programmation
- Programming Test Generator Tool(like Leetcode)
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Host a mini programming contest
If you want to host something yourself and don't mind doing the setup work, you can run your own instance of PC2 (which was formerly used by the ACM-ICPC contest) or DOMjudge or DMOJ.
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Becoming World #2 on Leetcode (by Contest Rating)!
The first type of practice is general problem solving. This is where you build up a strong intuition of problem and develop general problem solving techniques (but not memorising a huge list of techniques). Of course, the only way to improve is to do lots of problems / contests. For those who are more interested in competitive programming, I really like dmoj.ca (they host contests there as well, sometimes I author some :) ). The second type is just learning new concepts or techniques. I can't comment on courses such as "Grokking the Coding Interview" because I simply haven't done them. What I have enjoyed, however, is the CSES handbook (https://cses.fi/book/book.pdf). The book is very well written, and there is an additional problemset to test the concepts you just learnt at https://cses.fi/problemset/. Some of the concepts taught in the book are a bit out of scope for interviews, but would be great for anyone interested in competitive programming.
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Python practice website
Personally, I’ve heard good stuff about DMOJ https://dmoj.ca/ Hope it helps :)
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Privacy respecting or self hosting leetcode alternatives
DMOJ
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A note from our sponsor - SaaSHub
www.saashub.com | 7 Oct 2026
Stats
Basic online-judge repo stats
9
1,189
5.3
11 days ago
DMOJ/online-judge is an open source project licensed under GNU Affero General Public License v3.0 which is an OSI approved license.
The primary programming language of online-judge is Python.
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