CodeGrade vs DMOJ
CodeGrade
codegrade.com
DMOJ
dmoj.caSide by side
| Figure | CodeGrade | DMOJ |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 5 | 2 |
| Spec score · Automated Grading Software | 8.4 (#6) | 8.2 (#11) |
| Audience | CodeGrade says it was created by University of Amsterdam teaching assistants to help educators teach programming and give students meaningful feedback. | DMOJ offers free public contest hosting and says educational organizations can contact it about hosting private contests for a small fee. |
| Purpose | CodeGrade combines an autograder, IDE, and AI assistant in an online coding education environment. | DMOJ is a modern contest platform and archive of programming problems, and is entirely open source. |
| Support | The Free plan includes community support, while Starter and Advanced list unlimited support and onboarding or course setup assistance. | The site asks users with questions about hosting contests to contact a moderator. |
Plans
CodeGrade
- FreeFree
- AI Assistant Add-on$15, paid once
- Starter$24, paid once
- Advanced$39, paid once
- Institutional licensingPriced on request
In their own words
CodeGrade
CodeGrade is an online coding education environment combining an autograder, browser editor, interactive terminal, and AI assistant. The autograder gives instant feedback across more than 175 programming languages. Students work in a real Ubuntu environment without installing software, connect GitHub or GitLab repositories, and submit through Git pushes. Instructors can configure AI behavior per assignment, review conversation logs, comment on code lines, reuse feedback snippets, and support peer review. LTI integrations connect with Canvas, Blackboard, Moodle, Brightspace, Sakai, and Open edX, including grade and roster synchronization. Exam controls include session lockdown, IP restrictions, access passwords, and proctoring integrations. A full API supports course setup automation and analytics retrieval. The Free plan costs nothing and allows up to 50 students per course, with editor, drag-and-drop autograding, inline feedback, rubrics, GitHub integration, and community support. Starter costs $24, paid once per student/course; Advanced costs $39, paid once.
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.