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DMOJ VS AtCoder

Compare DMOJ VS AtCoder and see what are their differences

DMOJ

The DMOJ is a modern contest platform and archive of programming problems.

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0 reviews
Pricing
Open source
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AtCoder

AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online.

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Heartbeat Chat
Build a community people will pay for on Heartbeat. We provide everything you need to turn an audience into a business. Heartbeat is a solution for memberships, courses, events, payments, and more, unified by powerful automations and AI. sponsored

Which is more popular?

Based on our record, DMOJ seems to be more popular. It has been mentioned 11 times since March 2021.

social mentions
11 vs 0
Online Education popularity
68% vs 32%
alternatives listed
16 vs 14

Base details

Website, pricing, platforms and company facts side by side.

DMOJ
AtCoder
Website dmoj.ca atcoder.jp
Pricing
Open source
—
Listed in
Online Learning Online Education Programming Online Courses +1
Online Education Online Learning Programming Online Courses +1

Features and specs

What each product offers, as listed by its team.

DMOJ 5 features
AtCoder 0 features
  • Comprehensive Problem Set
    DMOJ offers a vast collection of problems spanning various difficulty levels and topics, making it suitable for both beginners and advanced coders.
  • Community Engagement
    The platform has an active community that contributes to discussions and shares insights on solving problems, fostering a collaborative learning environment.
  • Contest Hosting
    DMOJ regularly hosts and supports coding contests, which provide users with the opportunity to apply their skills in a competitive setting.
  • Multi-language Support
    Users can submit solutions in multiple programming languages, giving them the flexibility to choose and learn different programming languages.
  • Detailed Feedback
    The platform provides detailed feedback on submitted solutions, helping users understand their mistakes and improve their coding skills.

Possible disadvantages

  • User Interface Design
    Some users may find the interface to be outdated or not as intuitive as other coding platforms, which might affect user experience and navigation.
  • Problem Quality Variance
    While DMOJ has a large number of problems, the quality and clarity of problem descriptions can vary, which might be confusing for some users.
  • Limited Educational Resources
    Compared to other platforms, DMOJ may offer fewer tutorials or learning resources integrated into the site, which might affect beginners looking for structured guidance.
  • Server Downtime
    Users have occasionally reported server downtime or technical issues that can disrupt coding and contest participation.

No features have been listed yet.

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
DMOJ
AtCoder
68% 68%
Online Education
32% 32%
66% 66%
Online Learning
34% 34%
64% 64%
Online Courses
36% 36%
46% 46%
Programming
54% 54%

User comments

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

DMOJ 11 mentions
AtCoder 0 mentions
  • 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/. Source: over 3 years ago
  • 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. Source: over 3 years ago
  • 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... Source: about 4 years ago

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Tracking AtCoder since Oct 2026.

Alternatives to DMOJ and AtCoder

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