LeetCode is described as 'Platform for learning and improving coding skills with the goal of being fully prepared for programming interviews. Choose problems to solve from categories such as System Design, Algorithms and Database, join code contests and engage in mock interviews' and is a Code Learning service in the development category. There are more than 50 alternatives to LeetCode, not only websites but also apps for a variety of platforms, including SaaS, Windows, Mac and Android apps. The best LeetCode alternative is Codecademy, which is free. Other great sites and apps similar to LeetCode are exercism, HackerRank, Project Euler and Codewars.
Explore free interactive coding courses in web development, data science, and various languages. Codecademy offers a fun, collaborative learning environment with community support, personalized paths, skill assessments, and more, covering both foundational and advanced concepts.
Download and solve practice problems in over 30 different languages. For code newbies and experienced programmers.
A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.
Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.
There is a mathematical focus and has good examples of why some problems need optimized algorithms. You get exposed to a lot of cool math concepts and are challenged to write in efficient time and space complexity.
I haven't used HackerRank yet, but Codewars is the most similar to LeetCode in terms of having a large library of problems you can solve in multiple different languages. It's a lot more focused on being crowd-sourced though so it has a larger library and the solutions aren't paywalled like in LeetCode
Interactive platform for acquiring Web3 skills via Missions—micro-tasks covering crypto topics—rewarding users with tokens, NFTs, and merchandise from crypto brands. Earn Bits to boost winning odds, create Missions, join Guilds, and benefit from referrals.
DevPrep is a voice interview simulator that actually talks back. The AI asks you technical questions out loud, listens to your spoken answer, evaluates it, and asks follow-up questions just like a real technical interviewer would.
AceCoder is an invisible desktop app that instantly delivers solutions to any coding interview question.
Four-Leaf is an AI career prep platform. Voice mock interviews, resume tailoring, cover letters, salary negotiation coaching, and application tracking, all organized per job application.
Free AI-powered Chrome extension for LeetCode that provides intelligent coding hints, FAANG-style mock interviews, and auto-generated study notes with spaced repetition.
octree.io is a platform where you can practice Leetcode-style problems in a room with other people. It serves as a supplement to Leetcode as you can invite your friends to practice problems together. It features a Game Room, Trivia Room and a Lobby which is a Slack-like chat...
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A little more mathy. Instead of submitting a bit of code you actually submit the answer to a problem that should be solved through code. But it's free and unpaywalled so it's a cool little project. Currently around 760 problems