Best Site to Practice Coding Interview Questions: 5 Picks

The best site to practice coding interview questions depends on what you need to improve: solving DSA problems, explaining your thinking, or getting feedback. These five picks cover different parts of prep, and Phantom Code AI can add AI-guided practice for candidates who want to rehearse interview-style rounds.

Table of Contents

• NeetCode: focused DSA practice with explanations
• AlgoExpert: a curated set for structured preparation
• Interviewing.io: realistic mock interviews with engineers
• GeeksforGeeks: tutorials paired with coding challenges
• Exercism: free language practice with human mentor feedback
• Compare the best coding interview practice sites at a glance
• FAQ
• Conclusion

1. NeetCode: focused DSA practice with explanations

NeetCode is a structured resource for data structures and algorithms practice. Its question library has more than 300 problems, and the free roadmap helps you work through core interview topics in an ordered way. It suits candidates who want a clear starting point instead of picking random questions.

Explanations matter when a problem doesn’t click. NeetCode’s free YouTube channel has video explanations, while NeetCode Pro adds more than 200 in-depth videos. Pro also includes more than 300 problems, the NeetBot AI assistant, and AI hints and debugging support. A hint can help you find the next step while leaving you to write the solution.

Use the roadmap to build pattern recognition, then explain each solution out loud. For instance, after solving a sliding-window problem, say why the window moves and give the time complexity. A correct answer is useful; a clear explanation is what lets an interviewer follow your reasoning. This guide to coding interview patterns can help you plan that review by topic.

NeetCode is strongest when your main need is focused DSA study. It won’t replace practice speaking under interview pressure, so add mock rounds as your interviews get closer.

2. AlgoExpert: a curated set for structured preparation

AlgoExpert is a coding interview prep site with a curated set of problems. It suits candidates who prefer a smaller problem set with video explanations and an in-browser editor, rather than a large library that can feel hard to plan around.

The curated size can help you focus. Instead of spending a session searching for the next question, choose a problem and work through it. Then use the video explanation to compare your approach with the suggested solution. If you solved it another way, check whether your code handles edge cases and whether you can explain its time and space costs.

The in-browser editor keeps the problem and your code in the same place. That makes it easier to repeat a question later without rebuilding your setup. Video explanations can also help when a written answer feels too compressed or skips the reasoning behind a key step.

A smaller library is a trade-off, not a flaw. AlgoExpert fits a focused study block, especially when you want guided explanations. If your plan calls for broad exposure to many variations, pair curated practice with another source rather than trying to stretch one set beyond its purpose.

3. Interviewing.io: realistic mock interviews with engineers

Interviewing.io runs anonymous mock interviews with senior engineers. It suits candidates who can solve problems alone but want to practice explaining their choices while another person asks follow-up questions. The anonymous format means neither side knows the other’s identity during the mock.

A live mock changes the task. You need to clarify the prompt, share a plan, and keep talking while you code. If a test case breaks your solution, you also need to debug it in front of someone. That’s a different skill from recognizing a familiar pattern in a quiet practice session.

Feedback from an engineer can show where your explanation loses the thread. For example, you might state the right algorithm but skip why it fits the input constraints. A mock gives you a chance to notice that gap before a hiring round. Interviewing.io also has a free AI Interviewer for coding and system design practice.

Choose this type of practice when you need live communication feedback, not just another answer key. For more options focused on the live format, compare these mock coding interview platforms.

4. GeeksforGeeks: tutorials paired with coding challenges

GeeksforGeeks combines written tutorials with coding challenges. It suits learners who want to review a concept before testing it with a problem. The practice material is free, which makes it an accessible place to fill a knowledge gap while preparing.

Its interview prep questions are grouped by topic. The set spans arrays, strings, searching, sorting, hashing, recursion, linked lists, trees, heaps, graphs, and dynamic programming. That structure can help you spot an area to revisit after a mock or timed problem exposes a weak point.

Say you keep mixing up a queue and a stack in graph problems. Review the relevant data structure, then solve a question that uses it. This learn-then-practice loop is useful when you understand the problem statement but can’t yet explain the core idea or choose the right structure.

GeeksforGeeks works well as a broad study reference. Keep your session goal narrow: review one topic, solve a related challenge, and write down what you missed. That short record makes it easier to choose the next practice question without starting over each day.

5. Exercism: free language practice with human mentor feedback

Exercism is a free, open-source, not-for-profit coding practice platform with tracks in more than 80 programming languages. It suits developers who want to build fluency in a chosen language and get feedback on how they write code, not only whether it passes tests.

Human mentor feedback is a distinctive part of Exercism. You can work through exercises in a language track, then ask for a review of your solution. That feedback can help you notice a clearer or more idiomatic way to express the same idea. It’s a useful complement to interview problem banks, especially if your chosen language feels rusty.

For example, after solving a string problem, review whether your code uses the language’s common tools clearly. Then explain the algorithm separately. Clean language use helps, but interview practice still needs reasoning about complexity and edge cases.

Exercism is best for language learning and code feedback, rather than a dedicated interview roadmap. Use it to sharpen your coding habits, then pair it with DSA questions or a mock interview when your goal is a technical screen.

Compare the best coding interview practice sites at a glance

These sites address different parts of interview prep, so the best fit depends on the task you need to practice. Use the table to choose a starting point, then add a second format only if it fills a clear gap.

Phantom Code AI is another option when you want AI-guided interview practice rather than only a question library. New accounts get free credits at signup with no card required, and the tool runs on macOS and Windows. That can complement DSA study when you want to rehearse how you respond during a mock round.

Consistency matters more than switching sites every few days. Pick a topic, solve a question, and explain your reasoning aloud. Then use the next session to revisit the point that slowed you down.

FAQ

What is the best site to practice coding interview questions?

NeetCode is a strong starting point if you want a structured DSA roadmap with video explanations. AlgoExpert is another fit for a smaller curated set, while GeeksforGeeks pairs tutorials with challenges. If you need live feedback, consider mock interviews; the right choice depends on the skill you’re working on.

Are coding interview practice sites free?

Some are free, while others have paid features or access rules. GeeksforGeeks is free, and Exercism is a free, open-source platform. NeetCode has a free roadmap and video explanations on YouTube. Interviewing.io offers a free AI Interviewer; check its site for the cost of mocks with human interviewers.

How should I practice coding interview questions?

Choose one topic, solve a problem without looking at the answer, and explain your approach aloud. Check edge cases and state the time complexity. If you get stuck, use a hint or explanation, then retry the problem later without help. Add mock interviews when you need to practice talking and coding at the same time.

Do I need a mock interview if I already solve coding problems?

A mock can help because solving alone doesn’t fully rehearse explaining your reasoning to another person. In a live round, you may need to clarify a prompt, respond to a follow-up, or revise your plan while someone watches. Use a mock to find those gaps, then return to targeted problem practice.

Conclusion

Start with NeetCode for a clear DSA path, then add a live mock if explaining your code is the hard part. If you want AI-guided mock practice as part of your prep, take a look at Phantom Code AI and try a session that matches the interview format you’re preparing for.