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DMOJ

Free#26 of 33 in Automated Grading SoftwareCoding Challenge Platforms

DMOJ: A flexible open-source judge for competitive programming and code evaluation. Ranked #26 of 33 in Automated Grading Software by our editors (6.6/10); pricing: Open source; best for open-source competitive programming judging.

6.6/10Editor score
Visit DMOJ
DMOJ6.6 Visit DMOJ

At a glance

  • Editor score
    6.6 / 10
  • Pricing
    Open source
  • Best for
    Open-source competitive programming judging
  • Paid from
    Free
  • Programming autograding
    Yes
  • Facts checked
    20 Sep 2026

  • Where it wins

    • Supports over 60 programming-language runtimes
    • Includes custom validators and per-language resource limits
    • Offers configurable contests, plagiarism detection, and live updates

  • Where it doesn't

    • Focused on programming rather than broader academic grading workflows
    • No verified LMS integrations
    • Independent installations require self-hosted operation

Our verdict on DMOJ

DMOJ is an open-source online judge and programming contest platform for programming education, competitions, and automated code evaluation. It is designed for organizations, educators, and competitive programming communities that need to assess submitted code against test data. Users can submit solutions across more than 60 programming-language runtimes, while the platform applies resource limits and reports live submission status updates. DMOJ is available through the hosted DMOJ site or as software installed and operated independently.

Its strongest area is the depth of its judging and contest model. DMOJ supports interactive and signature-graded tasks, custom output validators, runtime data generators, and per-language resource limits. Contest administrators can configure ICPC, IOI, AtCoder, and ECOO formats, with hidden scoreboards and virtual participation available for structured competition workflows. Multilingual problem statements can include LaTeX and diagrams, and plagiarism detection is provided through Stanford MOSS. These capabilities make DMOJ more suitable for varied programming challenges than a basic submission-and-score tool.

DMOJ is also a focused choice rather than a broad academic grading suite. The platform supports two-factor authentication and administrative controls, but its documented scope centers on programming judging, contests, and related evaluation tasks. There are no paid tiers to compare: DMOJ is open-source software rather than a conventional commercial product. Choose it when flexible judging, contest formats, runtime control, and independent operation are priorities. Organizations seeking verified LMS integrations or broader academic grading workflows should consider a product built around those requirements instead.

Your product? Our editors can test DMOJ in depth and publish a review, labelled as paid · from $149/mo →

DMOJ pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.
See plans on dmoj.ca

DMOJ fact sheet

Free planNot verified
Paid fromFree
Programming autogradingYes
Math autogradingNot verified
Written-work OCRNot verified
LMS or LTI supportNot verified
Question bankNot verified
Supported code languagesNot verified
DeploymentCloud, Self-hosted
PlatformsWeb
Compliance & security2FA
SupportCommunity, Docs
Built forSolo, Small business, Mid-market, Enterprise (editorial estimate)
PricingOpen source
Websitedmoj.ca
Facts checked20 Sep 2026

Alternatives to DMOJ

See all DMOJ alternatives →

Also Ranked In

DMOJ is ranked in 2 of our directories.

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Featured on iTechGuides

Featured on iTechGuides — DMOJ 6.6/10

DMOJ is listed in our Automated Grading Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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