AI Code Tester

Your AI-Powered Coding Mentor &Interview Coach

Tackle personalized coding challenges, simulate real interview rounds, and get instant AI-powered feedback that accelerates both your skills and your career.

Practice Mode Interview Prep Mode

Precise AI analysis

Feedback in ~5.2s

98% pass detection

AI Test

Kiro Hackathon Sanity Check

Quick check to confirm you’re truly in Kiro territory before the AI flexes its brain.

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function isKiro(s) {
  // Sanity check for 'kiro'
  const clean = s.toLowerCase();
  const result = clean.includes('kiro');
  console.log(result ? '✅ Welcome to the Kiro Hackathon!' : '❌ Not Kiro material...');
  return result;
}
console.log(isKiro('Kiro Hackathon')); // true

Ready to evaluate.

JavaScriptPythonTypeScriptJavaGoRustC++C#RubyPHPSwiftKotlinJavaScriptPythonTypeScriptJavaGoRustC++C#RubyPHPSwiftKotlin

const sum = (a, b) => a + b;for (let i = 0; i < n; i++) { /* ... */ }def is_prime(n): return all(n % i for i in range(2, n))console.log('PrepioAI');if (arr?.length ?? 0) result.push(...arr)

Capabilities

Why Developers Choose PrepioAI

Experience the future of coding education with AI personalization and instant insights.

AI-Powered Challenges

Get unique, personalized coding challenges generated by advanced AI tailored to your skill level.

Instant Feedback

Receive detailed analysis on correctness, efficiency, and code quality with actionable suggestions.

Professional Editor

Code in a VS Code-like environment with syntax highlighting and intelligent features.

Skill Progression

Track your improvement over time with detailed analytics and personalized learning paths.

type Result = 'pass' | 'fail'function normalize(s){return s.trim().toLowerCase()}let memo = new Map()class Graph { constructor(){ this.adj = {} } }SELECT * FROM results WHERE status = 'pass';

Under the hood

How our AI evaluates your code

A multi-signal evaluator looks at correctness, complexity, and security simultaneously.

AI Review

Live preview of the evaluator commentary.

Finds valid pair indices across duplicates and negatives.
Randomized fuzz tests confirm stability and determinism.
Graceful handling when no valid pair exists.

AI Test

Two Sum Validator

The evaluator verifies functional correctness across edge cases and random inputs.

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function twoSum(nums, target) {
  const map = new Map();
  for (let i = 0; i < nums.length; i++) {
    const need = target - nums[i];
    if (map.has(need)) return [map.get(need), i];
    map.set(nums[i], i);
  }
  return null; // not found
}
console.log(twoSum([2,7,11,15], 9)); // [0,1]

Ready to evaluate.

try { run() } catch (e) { handle(e) }assert.equal(output, expected)return true<Button />

Sharpen your skills

Practice that feels like real work

Quick challenges, adversarial edge cases, and instant coaching that grows with you.

Live Coding Flow

See how problems unfold—steady typing, sharp fixes, real patterns.

snippet.ts

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Real patterns

Edge cases

Clean fixes

Targeted Fix Challenges

Small, surgical bugs that build precision and pattern recognition.

Efficiency Mastery

Learn to spot hot paths and reduce complexity with guided tips.

Secure by Design

Identify injection sinks, unsafe APIs, and fix them fast.

Clean Code Coaching

Readable, maintainable solutions with feedback that sticks.

AI Mentorship

Actionable suggestions, not just scores so you improve every attempt.

Interview Ready

From quick fixes to reasoning practice that maps to real interviews.

try { run() } catch (e) { handle(e) }assert.equal(output, expected)return true<Button />

Social proof

What developers say

Join thousands of developers improving their skills with AI-powered challenges.

"Prepio helped me identify gaps in my JavaScript knowledge I never knew existed. The AI feedback is incredibly detailed."

Sarah Chen

Frontend Developer

"The personalized challenges are perfect for interview prep. I improved my problem-solving skills significantly."

Marcus Rodriguez

Software Engineer

"As a beginner, the hints and explanations helped me understand not just what to fix, but why. Game changer!"

Emily Johnson

CS Student

// AI review: looks great!

/* complexity: O(n) */

const sum = (a, b) => a + b;for (let i = 0; i < n; i++) { /* ... */ }def is_prime(n): return all(n % i for i in range(2, n))console.log('PrepioAI');if (arr?.length ?? 0) result.push(...arr)

FAQ

Questions? We’ve got answers.

const sum = (a, b) => a + b;for (let i = 0; i < n; i++) { /* ... */ }def is_prime(n): return all(n % i for i in range(2, n))console.log('PrepioAI');if (arr?.length ?? 0) result.push(...arr)

Ready to level up your coding skills?

Start your first AI-powered challenge and get instant feedback no setup required.

Practice Mode

Your AI-Powered Coding Mentor &Interview Coach

Why Developers Choose PrepioAI

How our AI evaluates your code

Practice that feels like real work

Complete Technical Interview Simulation

Coding Challenge

Technical Q&A

Behavioral Simulation

Feedback & Report

Coding Challenge

Technical Q&A

Behavioral Simulation

Feedback & Report

Why Choose Our Interview Prep?

What developers say

Questions? We’ve got answers.

Ready to level up your coding skills?

Your AI-Powered Coding Mentor &Interview Coach

Why Developers Choose PrepioAI

How our AI evaluates your code

Practice that feels like real work

Complete Technical Interview Simulation

Coding Challenge

Technical Q&A

Behavioral Simulation

Feedback & Report

Coding Challenge

Technical Q&A

Behavioral Simulation

Feedback & Report

Why Choose Our Interview Prep?

What developers say

Questions? We’ve got answers.

How does the AI generate challenges?

Do I need prior experience?

Which languages are supported?

Ready to level up your coding skills?