“Wrong answer” teaches nothing.
Write C in the browser, graded byte for byte. Every failing test names the line, the column, the byte. The full verdict, Valgrind included, lands in milliseconds.
Tests
2 of 2 failing
It started with a friend.
I wrote exercises for a friend preparing for a computing school's entrance exams. Over video calls, she wrote code and I checked it.
While she worked, I built a small program to run the tests and deliver the next exercise. I shared it on GitHub: the original Grademe Bash script was born.
- The first Bash script.
- Distribution of the original script ends.
- Grademe becomes a web platform.
Learning stays free.
Everything you can use today is free, and will stay free for students.
For now, we're self-funded. As more people join, server costs grow. We keep optimising how Grademe runs so we can welcome more learners without making it too expensive to sustain.
Our goal is for Grademe to cover its own costs. Our priority is paid partnerships with schools and training providers, so students can keep learning for free.
Future services may help fund the platform. The tools you use today will stay free, so everyone can keep learning and practising, whatever their budget.
Privacy, in plain words.
What we keep, why, and for how long.
Read our privacy policyYour account, saved code and progress are stored in Europe. Our privacy policy lists the providers we use, retention periods and how to request deletion.
No advertising or analytics cookies, no session recordings, and no selling your data. We use essential cookies and usage statistics that aren't linked to your account to improve Grademe.
Sign in with GitHub, Google or an email code. There's no Grademe password to create or store. Technical logs help us fix bugs and protect the service.
Explore Grademe.
A full C learning path is available today, from your first program to memory management. Python, JavaScript and more languages are coming soon.
Learn C
A guided path, with a checkpoint after each chapter.
Exercises
One problem at a time. Feedback from real tests.
Challenges
A series of exercises. One clock.
Studio
Write your own exercises and challenges. Share them with everyone.
Daily Challenge
A daily puzzle. Other learners' approaches to explore.
C Visualizer
Step through variables, pointers and memory. On desktop.
CLI
Take challenges in your terminal, with your own editor.
GitHub sync
Publish your passing solutions to a repository you own.
"Nice project, good to learn, and check for other solutions and way of thinking."
"Thanks for the high quality problems!"
"The platform layout and testing speed are great!"