Computer science practice

AI that reads your code — and helps you understand it.

Write a solution and Silver reads the logic, not just the output: a score with partial credit, a clear rubric, and one hint toward the next step. It guides you without handing over the answer — and can ask you to explain a line you wrote.

Start practicing Grade my FRQ — free
Works with Python, C++, Java, C# and more.
Solution.java
public int sum(int[] a) {
  int s = 0;
  for (int x : a) s += x;
  return s;
}
80 / 100Silver read your code — partial credit
✓ Loops over every element
✓ Accumulates the sum correctly
✕ Handles an empty array
How it works

Feedback that goes past pass/fail

Most autograders only check whether the output matches. Silver reads the code, guides you, and can check that your understanding is real.

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Reads your code

Silver looks at the actual logic and style — not just the output — and returns a score with partial credit and a rubric, including for open-ended solutions.

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Hints, not answers

A step-by-step tutor that gives one hint at a time and points you to the next move. It won't write the solution for you.

🛡

Explain your code

Silver can ask you to explain a line you wrote and check whether the answer shows real understanding — instead of guessing with an AI detector.

Free · No card required

An AI assistant that tracks what you actually know

Practice tells you what to do next. The assistant tells you where you really stand — built from your own work, not from a quiz about yourself.

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Confirmed vs. only looks learned

Solving a task after three tries is not the same as solving it first time. The exam counts the first try — so the assistant counts it too, and shows the gap.

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Your weakest topic, named

Not a percentage — a specific skill: loop bounds, off-by-one, array traversal. With the tasks that prove it, and the ones that will fix it.

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Honest about what it doesn’t know

No invented mastery percentages, no predicted exam score. If you have done three tasks, it says so — «not tried» means we have no data yet, not that you are behind.

See my progress
Supported languages Python C++ Java C# JavaScript Pascal
Run · Share · Embed

A compiler you can share and embed

Write and run Python and Java right in the browser — then share a link or drop an interactive, runnable editor into any site, blog, or LMS. A free Trinket alternative, with Trinket import.

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Run in the browser

No install. Students run Python and Java instantly, with program output and matplotlib / turtle graphics rendered inline.

🔗

Share a link

Turn any snippet into a short link. Edit it once and every shared link and embed updates — no re-sharing.

❮❯

Embed anywhere

Paste one iframe to embed a live, editable editor in your LMS or lesson page — configurable view, height, autorun and read-only.

Open the compiler
By design

AI that supports learning, not replaces it

Hints escalate one step at a time and never include the full solution. The assistant can ask you to explain your own code to confirm you understand it. The goal is to help you learn to program — including how to work with AI — while keeping the thinking yours.

19864 programming problems with automatic checking.

Try it on a problem.

Pick a programming task, write your solution, and let Silver read your code.

Start practicing Grade my FRQ — free