Codechef
HackerRank
AlgoExpert.io
CodeForces
LeetCode
Coderbyte
Interview Cake
Codewars
TrueCert
TestGorilla
HackerRank
CodeSignal
Codility
iMocha
Adaface
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.
TrueCert is a skills-verification platform built for developers and the teams that assess them. Instead of trusting a resume line or a years-old certificate, candidates take a short, practical assessment and earn a credential anyone can verify.
The assessments go beyond multiple choice. Ordering, matching, code-completion, and short-answer formats test whether someone can actually do the work, not just recognize a fact, and partial credit means a near-miss is scored fairly. Every result comes with a topic-level breakdown (strong on networking, developing on cost optimization) so the score is actionable, not just a pass or fail.
For employers and recruiting agencies, TrueCert is a screening tool: send candidates a 10-minute practical test before the interview, then verify each result independently through a shareable link. No proctoring, no testing-center friction. For individuals, a passed assessment becomes a verifiable, shareable credential to prove skills to employers.
Assessments span more than 120 titles across 15 categories, including Terraform, Kubernetes, Docker, AWS, Azure, Linux, Python, SQL, and more.
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TrueCert's answer:
Most tools do either screening or credentialing. TrueCert does both, so a passed assessment is both a hiring signal an employer can independently verify and a credential the candidate owns and can reuse. The assessments test application rather than recall, results are checkable without taking anyone's word, and the catalog spans 175+ certifications across 15 categories (DevOps, cloud, AI, databases, office, collaboration, and more), with a free introduction tier and paid assessments from $14.99.
TrueCert's answer:
Two connected groups. First, developers and technical professionals who want to prove their skills with a credential employers can verify. Second, the employers and recruiting agencies who screen them, teams that want to test candidates before the interview, or map and validate their own team's skills. Strongest fit for DevOps, cloud, and platform roles.
TrueCert's answer:
TrueCert started from a simple frustration: resumes and years-old certificates are claims, not evidence, and heavyweight proctored exams are expensive and test recall over real ability. We built a lightweight way to prove what someone can actually do, practical assessments that produce a verifiable, shareable credential, so skills can be trusted without a testing center or a leap of faith. Built and operated by idealy AB in Sweden.
TrueCert's answer:
TrueCert is a browser-based web application with nothing to install. It integrates Stripe for payments, standard OAuth sign-in (Google, GitHub, Microsoft), and issues Open Badges 2.0 credentials with QR-based public verification.
TrueCert's answer:
TrueCert combines two things usually sold separately: practical skills testing and verifiable credentials. Candidates take short, hands-on assessments that go well beyond multiple choice, drag-to-order, matching, multi-select, code completion, predict-the-output, fill-in-the-blank, and scenario-based questions, all with partial credit so a near-miss still scores fairly.
Every result becomes a shareable credential anyone can verify through a public link, no proctoring or testing center required, and each comes with a topic-level breakdown of strengths and weaknesses, so the score is actionable rather than just a pass or fail.
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.
TestGorilla - TestGorilla ATS is an applicant recruiting software that helps companies hire candidates easily without any hassle.
AlgoExpert.io - A better way to prep for tech interviews
CodeForces - Programming competitions and contests, programming community.
CodeSignal - CodeSignal is the leading assessment platform for technical hiring.
LeetCode - Practice and level up your development skills and prepare for technical interviews.