codePost

What codePost is

codePost is a feedback platform for grading code, PDFs, and Jupyter Notebooks. It gives instructors split-panel code review with inline highlighting, comment cards that apply point deductions, and shared rubrics. They can add inline Markdown comments to code, gray out template code, annotate notebooks and text files, and apply rubric items. Its autograder runs unit tests or custom test scripts on submissions in Docker-based sandboxed containers. Instructors can expose selected tests to students, limit test runs, and require particular uploaded filenames. Built-in language support includes Python, Java, C/C++, Node.js, R, and more. Native integrations include Canvas, Blackboard, Jupyter Notebooks, GitHub, JSFiddle, Brightspace, CodePen, Repl.it, Pearson Revel, and homegrown systems. An SDK and REST API provide programmatic access. For large courses, the platform includes roster management, LMS synchronization, granular TA permissions, and shared rubrics. Its stated users include instructors, graders, and students in undergraduate, high-school, and bootcamp computer science courses. The Free service is listed as free for computer science educators. The former codepost.io service was donated to Rutgers University's Department of Computer Science; its web version was scheduled to shut down permanently on January 1, 2026.

Who it suits

codePost suits instructors and graders who need to review and grade code, PDFs, or notebooks, especially in large computer science courses. Its LMS integrations, roster tools, TA permissions, and automated testing may also serve undergraduate, high-school, and bootcamp teaching teams.

Limits

The free service is described for computer science educators. Math autograding and written-work OCR are not supported. The web version was scheduled to shut down permanently on January 1, 2026.

Getting started

1. Visit https://codepost.cs.rutgers.edu/.
2. Use the free service, listed as free for computer science educators.
3. Connect through a native integration such as Canvas, Blackboard, or Jupyter Notebooks, if applicable.
4. Submit code, PDFs, or Jupyter Notebooks for review and grading.
5. Configure rubrics, feedback, and automated tests for course submissions.

Verdict

Consider codePost if your course needs structured code feedback, rubric-based grading, and sandboxed autograding, with integrations or API access. Its stated free service is for computer science educators, and the scheduled web shutdown date is important to weigh when choosing it.