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codePost
What it is
codePost is a free feedback and grading platform for code, PDFs, and Jupyter Notebooks. It provides split-panel review, inline highlighting, comment cards that can deduct points, and shared rubrics. Instructors can add Markdown comments, hide template code, annotate notebooks and text files, and apply rubric items. Its autograder runs unit tests or custom scripts in Docker-isolated containers. Instructors can expose selected tests, limit test runs, and require specific filenames. Built-in language support includes Python, Java, C/C++, Node.js, R, and more. Integrations include Canvas, Blackboard, GitHub, Jupyter Notebooks, Brightspace, CodePen, Repl.it, Pearson Revel, JSFiddle, and other systems. An SDK and REST API provide programmatic access. Large courses can use roster management, LMS synchronization, TA permissions, and shared rubrics. The platform supports web, API, and self-hosted use. Its former codepost.io service was donated to Rutgers University, and its web version was scheduled to shut down permanently on January 1, 2026.
For and against
For
- Free plan for computer science educators
- Docker-isolated unit-test and script autograding
- Supports several programming languages
- LMS integrations and REST API
- Shared rubrics and granular TA permissions
Against
- Web version scheduled to shut down January 1, 2026
- No math autograding
- No written-work OCR
- No question bank
The verdict
codePost combines code-focused review, rubric grading, and sandboxed autograding with broad course integrations. The scheduled web shutdown is an important availability consideration.
Who it suits
It suits instructors, graders, and students in computer science courses, including undergraduate, high-school, and bootcamp teaching. Large classes needing LMS links and controlled autograding may find its course-management tools relevant.
Plans and prices
Free service
Computer science educators
Read 30 Sep 2026 · codepost.io
On the record
- Annotation
- Instructors can annotate code with inline Markdown comments, gray out template code, annotate Jupyter notebooks and text files, and apply rubric items.codepost.cs.rutgers.edu · read 30 Sep 2026
- API access
- codePost offers programmatic access through an SDK or REST API.codepost.cs.rutgers.edu · read 30 Sep 2026
- Autograding
- codePost runs unit tests or custom test scripts automatically on submissions in sandboxed containers.codepost.cs.rutgers.edu · read 30 Sep 2026
- Availability
- The former codepost.io service operated as a free service for computer science educators and was donated to Rutgers University's Department of Computer Science; its web version was scheduled to shut down permanently on January 1, 2026.codepost.io · read 30 Sep 2026
- Code review
- The platform provides split-panel code review with inline highlighting, comment cards with point deductions, and shared rubrics.codepost.cs.rutgers.edu · read 30 Sep 2026
- Course scale
- The platform is designed for large courses, with roster management, LMS synchronization, granular TA permissions, and shared rubrics.codepost.cs.rutgers.edu · read 30 Sep 2026
- Integrations
- Native integrations include Canvas, Blackboard, Jupyter Notebooks, GitHub, JSFiddle, Brightspace, CodePen, Repl.it, Pearson Revel, and homegrown systems.codepost.cs.rutgers.edu · read 30 Sep 2026
- Languages
- The platform has built-in support for Python, Java, C/C++, Node.js, R, and more.codepost.cs.rutgers.edu · read 30 Sep 2026
- Purpose
- codePost is a feedback platform for grading code, PDFs, and Jupyter Notebooks.codepost.cs.rutgers.edu · read 30 Sep 2026
- Sandboxing
- The autograder uses Docker-based isolation for testing student code.codepost.cs.rutgers.edu · read 30 Sep 2026
- Test controls
- Instructors can expose a subset of tests on student submission, limit test runs, and require specific uploaded filenames.codepost.cs.rutgers.edu · read 30 Sep 2026
- Users
- The stated audience includes instructors, graders, and students in computer science courses, including undergraduate, high-school, and bootcamp teaching.codepost.io · read 30 Sep 2026
