Hands-on coding exercises, challenges, and real-world practice platforms.
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- Aizu Online Judge Free
- Contest platform and problem archive from the University of Aizu featuring programming contest problems.
- AtCoder Free
- Japanese competitive programming contests and practice problems.
- CodeChef Free
- Competitive programming platform with monthly contests and practice problems.
- Codeforces Free
- Competitive programming contests with real-time rating system.
- CodeKata Free
- Dave Thomas's collection of coding katas designed to build skill through deliberate practice and repetition.
- Codewars Free
- Community-driven coding challenges (katas) in multiple programming languages.
- CodinGame Free
- Gamified coding challenges and programming puzzles with multiplayer.
- CodingBat Free
- Free practice problems for Java and Python with instant testing.
- CS Academy Free
- Online judge hosting biweekly contests with live chat, interactive lessons, and an integrated online editor.
- DevChallenges Free
- Project-based coding challenges for front-end, full-stack, and responsive web development with design specs.
- Exercism Free
- Free code mentorship and practice in 70+ programming languages with mentor feedback.
- Exercism - Mentoring Free
- Free one-on-one mentorship for code improvement in 70+ languages.
- Gophercises Free
- Free Go programming course with hands-on mini-projects teaching the language through building small apps.
- Interviewing.io Free
- Free anonymous technical interview practice with real engineers.
- JSChallenger Free
- Focused JavaScript exercises covering arrays, dates, objects, and DOM manipulation with instant feedback.
- Kickstart Free
- Free coding interview practice with Google engineers.
- OmegaUp Free
- Community-based competitive programming training platform that hosts the Mexican Olympiad in Informatics.
- Pramp Free
- Free peer-to-peer mock interviews for technical and behavioral questions.
- Rosetta Code Free
- Programming chrestomathy site with hundreds of tasks solved in many languages for comparative practice.
- Sanfoundry Free
- Thousands of MCQs, programming questions, and technical interview resources.
- Sphere Online Judge Free
- Large collection of algorithmic problems with community solutions.
- The Python Challenge Free
- Series of puzzles requiring Python code to advance to the next level blending math and programming.
- Timus Online Judge Free
- Russia's largest archive of programming problems with automatic judging from Ural Federal University contests.
- TopCoder Free
- Competitive programming arena and software development challenges.
- Virtual Judge Free
- Platform that lets users create virtual contests by aggregating problems from many notable online judges.
- AlgoDaily Freemium
- Daily coding interview challenges with detailed explanations designed to help land software engineering jobs.
- CheckiO Freemium
- Coding game platform where players solve Python and TypeScript missions to progress through island levels.
- Codeasy Freemium
- Story-driven C# coding course where you solve exercises to advance a military-themed narrative.
- Codebasil Freemium
- Mock coding interviews with real-time collaboration.
- Codecademy Freemium
- Interactive coding platform with exercises and projects across many languages and technologies.
- CodeCrafters Freemium
- Recreate popular tools like Redis, Git, and HTTP servers from scratch by completing step-by-step coding tasks.
- CodeHS Freemium
- Interactive coding exercises for students and teachers with autograding spanning K-12 to AP level.
- Codelab Freemium
- Interview preparation platform with coding problems and company tests.
- Codemia Freemium
- Real-world software engineering exercises and system design practice.
- CodeStudio by Coding Ninjas Freemium
- Indian platform with coding problems, guided interview tracks, and mock tests curated by mentors.
- Codility Freemium
- Programming tasks and online interviews for developers.
- Daily Coding Problem Freemium
- Daily coding interview problems sent to your inbox.
- Edabit Freemium
- Beginner-friendly coding challenges with instant feedback in multiple languages.
- GreatFrontEnd Freemium
- Frontend-focused coding exercises, UI challenges, and interview prep.
- HackerEarth Freemium
- Coding challenges, hackathons, and interview preparation platform.
- HackerRank Freemium
- Coding challenges, algorithms, data structures, and interview preparation.
- LeetCode Freemium
- Technical interview preparation with 3000+ coding problems and mock interviews.
- Python Principles Freemium
- Python-focused exercises with instant verification organized by topic to build core programming skills.
- Sololearn Freemium
- Mobile-friendly coding exercises and bite-sized challenges across many languages with community competitions.
- TestDome Freemium
- Pre-employment testing platform with programming exercises.
- Interview Pro Paid
- Mock interviews with engineers from FAANG companies.
- AlgoExpert Paid
- Interview prep platform with curated algorithm problems and video solutions.
- AlgoExpert - Systems Expert Paid
- System design interview course with real-world architecture problems.
- CodeInterview Paid
- Mock interviews with real engineers from top companies.
- CoderPad Paid
- Live coding interviews and technical assessments.
- Devskiller Paid
- Technical assessment platform with real-world coding tests.
- HireVue Paid
- Code-based assessments and technical interviews platform.
- Interview Cake Paid
- Interview preparation with guided practice problems and solutions.
- Interview Camp Paid
- System design and coding interview preparation course.
- VetBoss Paid
- System design and coding interview simulation with real-world scenarios.