Codechef
HackerRank
AlgoExpert.io
CodeForces
LeetCode
Coderbyte
Interview Cake
Codewars
SkillHacker.io
LeetCode
Codewars
Coderbyte
HackerEarth
CodeChef is a not-for-profit educational initiative started by Directi more than a decade ago. We started with a dream of seeing an Indian team winning a gold medal at the ACM ICPC World Finals. In its quest for the same, CodeChef has built a self-driven community of the world's best programmers. Today more than 1.3 million competitive programmers from 180+ countries learn from CodeChef. CodeChef has been hosting monthly programming contests regularly for 10 years now. Its platform has assessed 92 million+ code submissions to date, and over 30000 organizations are being impacted by CodeCheffers worldwide. It also organizes SnackDown - one of the world's largest global programming competition whose last edition drew participation from 140+ countries. Since 2017, CodeChef has started providing India's only industry-ready certification in Data Structures and Algorithms, and 1800+ programmers have been certified under the same.
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SkillHacker.io's answer:
SkillHacker helps developers level up through targeted testingโnot passive learning. Practice mode: hints, no timer, learn at your pace. Test mode: benchmark skills against peers targeting the same role. See exactly where you stand vs. real averages. 4-option questions focused on interview-ready fundamentals. Track progress, identify gaps, and build confidence before your next technical interview. Free to start, no credit card.
SkillHacker.io's answer:
Choose SkillHacker for active, role-focused testingโnot passive tutorials. Practice mode: learn with hints, no timer. Test mode: benchmark skills against devs targeting your same role, not generic averages. See real gaps, track progress, prep for interviews. 4-option questions on job-ready fundamentals. Free start, no credit card. Learn intentionally, grow measurably.
SkillHacker.io's answer:
Individual developers across all levels and stacks: frontend, backend, mobile, game dev, systems, and DevOps. SkillHacker serves English-speaking engineers preparing for technical interviews, validating skills for grade-ups, or benchmarking promotion readiness. Our audience chooses active, role-specific testing over passive tutorials to measure progress against peer averages, pinpoint knowledge gaps, and build data-driven confidence before career-defining evaluations.
SkillHacker.io's answer:
SkillHacker was born from personal frustration: I couldn't find any tool to objectively measure my theoretical dev knowledge. Scrolling through 100+ JS questions on GitHub gave no feedback, no progress tracking, no way to know "am I actually ready?" So I built SkillHacker - a platform where developers test actively, see real benchmarks vs. peers, and measure growth. No more guessing. Just data-driven skill validation for interviews and grade-ups.
SkillHacker.io's answer:
SkillHacker is built on a modern, performance-focused stack: Nuxt.js for fast SSR/SSG & SEO, MongoDB for flexible question storage & progress tracking, Tailwind CSS for a responsive UI, and Docker for consistent, scalable deployments. Chosen for speed, maintainability, and rapid iteration - ensuring a smooth, reliable testing experience for developers worldwide.
SkillHacker.io's answer:
Based on our record, Codechef seems to be more popular. It has been mentiond 7 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Have you heard of codeforces.com, atcoder.jp, codechef.com, etc? Source: over 2 years ago
Leetcode is good to learn basic algorithms because problem statements are usually straightforward. Competitive programming has much wider range of problems. Most popular sites for cp are codeforces.com , atcoder.jp, codechef.com . Source: over 2 years ago
Learn Java with hands-on experience. I personally used codingbat.com a lot, but I've heard good things about codechef.com, which appears to even have a competitive option. Source: over 3 years ago
For practicing algorithms, use any of the freely available websites like https://hackerrank.com https://codechef.com https://projecteuler.net A structured set of practice problems are available at https://www.interviewbit.com/courses/programming/ Avoid https://geeksforgeeks.org because it has a ton of material but very poor quality control. Source: about 4 years ago
These all have sample problems to solve Hackerrank.com edabit.com codewars.com codechef.com and there are tons more. Best of luck to you. I am at about the same level myself. I really like these sites. Source: over 4 years ago
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
LeetCode - Practice and level up your development skills and prepare for technical interviews.
AlgoExpert.io - A better way to prep for tech interviews
Codewars - Achieve code mastery through challenge.
CodeForces - Programming competitions and contests, programming community.
Coderbyte - Coderbyte is a place built for anyone to practice and perfect their programming skills.