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Your AI pair programmer for cleaner, tested code

CodeHelpers reviews your code, untangles tricky algorithms, and writes the unit tests you keep putting off. Built for working developers and students learning to ship.

Free for students. No spam, unsubscribe anytime.

faster code reviews
3x
to a full test suite
< 10s
languages supported
20+

// features

Three tools. One assistant that understands your code.

Every response is grounded in the context you share, so suggestions fit your codebase instead of a generic tutorial.

  • Code review

    Line-by-line feedback on readability, performance, and security. Catch edge cases and anti-patterns before your teammates or TA do.

    • Security & performance flags
    • Style-guide aware
    • Explains the "why"

  • Algorithm debugging

    Paste a failing function and get a step-by-step trace of where it breaks, plus a corrected version with complexity analysis.

    • Step-through traces
    • Big-O breakdowns
    • Off-by-one detection

  • Unit test generation

    Generate thorough tests for Jest, Vitest, pytest, JUnit, and more, covering happy paths, boundaries, and failure modes.

    • Edge-case coverage
    • Framework native
    • Ready to commit

// live preview

See it work on a real bug

A classic broken binary search. Pick a mode and run it to see how CodeHelpers responds.

search.js
1function binarySearch(arr, target) {2  let low = 0;3  let high = arr.length;4 5  while (low < high) {6    const mid = (low + high) / 2;7    if (arr[mid] === target) return mid;8    if (arr[mid] < target) low = mid;9    else high = mid - 1;10  }11  return -1;12}
you

Review this function for bugs and style issues.

Run the assistant to see a response for this snippet.