Grade the code.
We’ll do the teaching.
Coding assignments on the GitHub you already use. Distributed, auto-graded on every push, and explained. When a student fails, our AI tells them why. Not a new IDE, not Codio’s price, not locked in.
| Student | Recursion | Intro | Overall |
|---|---|---|---|
| ALada | 85 | 100 | 92% |
| BAbarbara Failed Recursion | Fail 38 | 64 | 51% |
| GRgrace | 91 | 98 | 92% |
| KAkatherine | 96 | Grading | 95% |
A red “Fail” isn’t feedback.
This is.
Every competitor shows a score. Only Coder in 90 turns it into teaching. The AI reads the real test output and your course notes, then explains the failure and the fix, with the output shown right beside it, so it’s verifiable, never a black box.
FAILED test_base_case: RecursionError: maximum recursion depth exceeded 1 passed, 4 failed
fib() never reaches its base case, so it calls itself forever. Add if n <= 1: return n before the recursive call. That stops the infinite descent, and the other four tests pass.Publish. Push. Graded.
Three steps on the GitHub you already use. No new IDE for your students, no platform to onboard onto.
Point us at a template repo
One click installs the GitHub App on your org. We generate a private repo per student and add them as collaborators. Nothing to import.
Students code and push
In their own editor or free Codespaces. A GitHub Actions workflow runs your tests on every push, the workflow they’ll use at work.
Scores and explanations land
The cohort gradebook fills automatically. Failing students surface with the reason, and an AI explanation they can act on.
Why instructors leave Codio
Coder in 90
- Free for instructors. Students a fraction of $48/sem
- Students code in real GitHub repos: branches, PRs, CI
- AI explains every failed test, grounded in your notes
- Zero lock-in. Your repos, your org, walk away anytime
- Set up in an afternoon by installing one GitHub App
Codio
- ~$48 per student per semester, IDE included whether you use it or not
- Proprietary browser IDE every assignment depends on
- A score and keystroke “frustration” analytics, no student-facing why
- Courseware and student work locked in Codio’s format
- Onboard onto a full managed platform
Being fair: Codio is the stronger fit if you need a managed cloud IDE with GPU/Jupyter, a big ready-made courseware library, or built-in plagiarism detection today. We’re deliberately leaner and GitHub-native.
Migrate before August 28.
Set up a cohort in minutes, on the GitHub you already use. Instructors start free, no card, no sales call.