DMOJ review
A flexible open-source judge for competitive programming and code evaluation.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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.
DMOJ pros and cons
- 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
DMOJ fact sheet, pricing and score →
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