DMOJ vs DOMjudge
DMOJ
dmoj.caDOMjudge
domjudge.orgSide by side
| Figure | DMOJ | DOMjudge |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| Linux | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 2 | 1 |
| Spec score · Automated Grading Software | 8.2 (#11) | 8.1 (#13) |
| Spec score · Coding Challenge Platforms | 8.0 (#11) | 7.9 (#14) |
| Purpose | DMOJ is a modern contest platform and archive of programming problems, and is entirely open source. | DOMjudge automatically judges programming contest solutions and provides web interfaces for teams, the jury, and the public. |
| Security reporting | DMOJ asks researchers to send potential security issues privately for responsible disclosure before making them public. | The project asks users to report security issues privately to [email protected]. |
| Support | The site asks users with questions about hosting contests to contact a moderator. | Users can seek installation and usage help through the development mailing list or the DOMjudge Slack workspace; responses on Slack may take longer depending on time zones. |
Plans
In their own words
DMOJ
DMOJ is an open-source platform for programming contests and an archive of programming problems. Its archive includes tasks from past CCC, CCO, COCI, IOI and JOI competitions, among other sources, and it runs a monthly open programming competition. Public contests can be hosted at no cost. Contest formats include ICPC, IOI, AtCoder and ECOO, with system testing, hidden scoreboards and virtual participation. Judging supports interactive and signature-graded tasks, runtime data generators, custom output validators, per-language resource limits and scaling to hundreds of judging servers. Problem statements can include Markdown, LaTeX math and figures, syntax highlighting, PDF generation and built-in editorials. DMOJ integrates with Stanford MOSS for plagiarism checking and supports OAuth login, two-factor authentication and fine-grained staff permissions. Documentation is available for self-hosting the site and judge; the installation guide says the site is tested with MySQL and is unlikely to work with other databases. AI use is prohibited in rated contests, and judging resources cannot be used for AI training.
DOMjudge
DOMjudge is a free system that automatically evaluates programming contest submissions and provides web interfaces for teams, juries, and the public. It is designed mainly for contests such as ICPC, where teams work on site against a fixed problem set and time frame. Judging can run across multiple judge hosts, and the system is designed to scale. Administrator tools support rejudging, clarifications, and detailed submission and judging information. A modular structure allows languages or compilers to be added, while a JSON REST API implements the ICPC Contest API with extensions, except for the optional team-members endpoint. DOMjudge imports Kattis Problem Tool packages, and Polygon2DOMjudge converts Codeforces Polygon exports. You can download and run it yourself; official Docker images are available for the domserver and judgehost. The listed latest stable release is version 9.0.1, dated 11 June 2026.