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.
Shader Learning is an interactive browser-based platform for learning GPU programming through practical exercises. It offers over 250 challenges in GLSL and HLSL, allowing users to write and test shaders directly in the browser without any setup.
LabEx is an interactive, hands-on learning platform dedicated to coding and technology. It combines labs, AI assistance, and virtual machines to provide a no-video, practical learning experience.
China
Level up your coding skills with a gamified twist! Tackle exercises across major languages, enjoy real-time stats, and climb weekly leagues. Keep your streak, compete with friends, and progress through categories. Available on iOS and Web.
Screen technical skills automatically with online coding challenges. Save time, reduce recruitment costs and hire better developers.
One programming challenge a day, the same one for everyone, solved in the browser in 11 languages with tests running in a sandbox.
Germany
EU
Kattis helps companies make safer recruitments and attract the best developers with its dynamic challenge platform.
SwedenEU
Take-Home Coding Assignments That Provide Real Insights. Identify great candidates using real tasks, not brainteasers. Streamline your tech recruiting workflow and make better hiring decisions.
Mutation testing practice platform for QA Engineers. Write pytest tests that catch hidden bugs in AI-generated code. 339 challenges across real-world domains, browser-based execution, instant feedback. Like LeetCode but for writing tests, not solving algorithms.
You still don't know Python. You know how to ask. That's fine until your job requires you to read someone else's code, debug something unexpected, or actually understand what the AI just handed you.
Practice 100+ Microsoft Excel exercises online. From beginner formulas to advanced functions like XLOOKUP. Instant feedback, step-by-step guidance. Try them free in your browser.
Stop wasting your engineers' time with candidates you never hire. Paircast video take-homes show you how candidates solve real-world problems before they reach your engineers. Records screen and code changes during development. Works with all languages.
System Overflow provides structured system design interview preparation content, including high-quality diagrams, design breakdowns, and experience-level guidance for software engineers preparing for technical interviews.
South Korea
