Announcing Our Interview Prep Platform — A Free LeetCode & NeetCode Alternative

Announcing the DevTools Daily interview platform — a free LeetCode & NeetCode alternative

We built a coding-interview preparation platform, and today we're opening it up. If you've been prepping on LeetCode or following along with NeetCode, this will feel familiar — a library of the questions that actually show up in interviews, a real in-browser editor, and instant feedback against test cases. The difference: it's free to start, works in five languages, and keeps track of your progress as you go.

48 of the most popular interview questions

We started where it matters most: the 48 most popular interview questions. These are the classics that come up over and over — Two Sum, sliding-window and two-pointer problems, binary search, stacks, dynamic programming, and graph traversal — the same core patterns you'd drill on LeetCode or NeetCode, curated so you're not guessing what to practice.

Every problem can be filtered by difficulty (easy, medium, hard) and by topic (arrays, hash maps, dynamic programming, two pointers, and more), so you can line up a focused session in seconds.

Solve in five languages

We support the five most popular interview languages: Python, JavaScript, Java, Go, and Rust. Open any problem, pick your language from the switcher above the editor, and the starter code, function signature, and test harness adapt to match.

def two_sum(nums: list[int], target: int) -> list[int]:
    # solution here
    return [0, 1]

function twoSum(nums, target) {
  // solution here
  return [0, 1];
}

class Solution {
    public int[] twoSum(int[] nums, int target) {
        // Your code here
        return null;
    }
}

func twoSum(nums []int, target int) []int {
	// Your code here
	return nil
}

fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {
    // Your code here
    Vec::new()
}

• Python and JavaScript run instantly in your browser — no backend round-trip, so you get results the moment you hit Run. No login required.
• Java, Go, and Rust run through our remote execution service. Sign in (it's free) and we compile and run your code against the same test suite.

Either way the test cases are identical across languages, so switching stacks never changes what "correct" means.

Real execution with console output

This isn't a static problem set. Your code actually runs: hit Run and we execute it against visible examples plus hidden edge cases (empty inputs, negatives, duplicates) that interviewers love to probe. You get the console output, pass/fail results per test case, and a problem only counts as Solved when every case passes — the same tight feedback loop you get from a real judge.

Ask AI to review your solution

Solved it, but not sure it's good? Every problem has a built-in Ask AI chat. One click seeds a review of your current code — it points out correctness issues and missed edge cases, spells out the time and space complexity, and tells you whether your approach can be tightened up. It prefers hints over spoilers, so you still do the thinking, and you can ask follow-ups in the same thread ("can this be O(n)?", "is there a way without extra space?").

Track your progress and history

The dashboard remembers what you've attempted and solved, so you always know where you left off. Come back tomorrow, filter to what you haven't finished, and keep your streak going — no spreadsheet required.

Step-by-step solutions when you're stuck

Every problem links to a worked solution that builds from the brute-force approach up to the optimal one, with time and space complexity spelled out at each step and reference code in all five languages.

Practice how you communicate, too

Getting the right answer is only half the interview. Our AI mock interview runs a full text-based coding interview — clarifying questions, walking through your approach, complexity, and testing — then gives you structured feedback on how you communicated.

Try it today

1. Explore the interview platform
2. Browse all 48 coding interview problems
3. Start with Two Sum
4. Read the Two Sum solution & complexity analysis
5. Take a text-based AI mock interview

It's free to start, there's no sign-up to run Python or JavaScript, and your progress is saved as you go. Pick your language, solve a problem today, and come back tomorrow — consistency beats cramming.

---