Two good tools.
Different bets.
Codio built one platform for every course, a managed cloud IDE with a deep courseware library. We made a narrower bet: keep students in the GitHub they’ll use at work, autograde on every push, and explain the failures. Here’s where each one shines, so you can pick honestly.
Side by side
Coder in 90
- 2-week free trial. Students always free
- 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
- One platform, every course, with a managed cloud IDE included
- Browser IDE so students start real coding work faster, nothing to install
- Auto-graded labs, rubric scoring, and keystroke-level analytics
- A large ready-made courseware library and LMS grade-sync
- GPU and Jupyter support for data and ML courses
Pick Codio if you want a managed cloud IDE with GPU/Jupyter, a big ready-made courseware library, or built-in plagiarism detection today. Pick Coder in 90 if you’d rather keep students on real GitHub, pay one flat instructor plan while students stay free, and give them an AI that explains every failure.
A red “Fail” isn’t feedback.
This is.
Both platforms auto-grade. The gap is what a student sees when they fail. Coder in 90 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.Try the GitHub-native side.
Set up a cohort in minutes, on the GitHub you already use. Instructors start free for 2 weeks, no sales call.