Exercism
Level up your programming skills with 3,450 exercises across 52 languages, and insightful discussion with our dedicated team of welcoming mentors. Exercism is 100% free forever. There are 52 different language tracks on Exercism for you to explore. Which one will you choose to learn first? Learning through Exercism is quite different to other programming websites, with a focus on individual practice and mentor-based learning. Here's how it works. Object oriented, functional, popular, emerging, or just plain obscure. With 52 different languages to explore, Exercism has something for you! All the coding happens on your machine in an environment you're familiar with. Download the template, solve the problem, and then upload your solution. Discussing code is one of the best ways to learn. Our friendly mentors will comment on your solutions online, introducing you to new ideas and techniques. Our tracks have between 40 and 100 exercise each.
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CodinGame
CodinGame by CoderPad is an online technical screening platform that enables recruiters, tech leaders and programmers to evaluate and shortlist candidates quickly with confidence. It lets you validate tech skills remotely, get rid of bias, reduce hiring costs and shorten your time to hire.
Its ease of use allows anyone, regardless of their tech skills, to quickly create a coding test in just a few clicks. Choose from a question bank of more than 3900 questions and exercises that supports 60+ programming languages, domains & frameworks and over 80 preset job roles of varying skill levels. With a 97% completion rate, its fun real-life questions and exercises ensure a positive candidate experience.
Customers include Nasdaq, Huawei and Electronic Arts.
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Codédex
Codédex is an online, interactive coding-learning platform that uses a gamified, adventure-style format to teach real programming languages and skills. Learners travel through “fantasy lands” corresponding to languages such as Python, HTML/CSS, JavaScript, React, and command-line tools (Git, GitHub), proceeding at their own pace while earning experience points, badges, and unlocking new regions as they progress. It combines bite-sized interactive lessons, an in-browser code editor for instant practice, and project-based tutorials to give users hands-on experience rather than just theory. With more than 200 hours of content, Codédex supports beginners with no prior coding experience and gradually builds up to more advanced topics, reinforcing learning through code challenges, exercises, and real-world projects. It fosters a supportive community through forums and events like monthly challenges and hackathons, helping motivate learners and provide peer support.
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CodeFriends
CodeFriends is an interactive, browser-based coding and AI learning platform that makes mastering programming fast and hands-on. It features a real-time code editor, an AI-powered tutor, and live learning stats so you can jump straight into practice without installing any software. Expert-designed courses cover Python, web development (HTML/CSS/JavaScript), AI fundamentals, prompt engineering, and work automation, each with hundreds of lessons and embedded exercises. Hands-on projects let you launch websites or automations with one click and share live links instantly. Advanced tools include AI code generation for smarter coding, step-by-step lectures, digital textbooks with in-depth explanations, project versioning with rollback, one-click hosting, and downloadable code exports for portfolios. Institutions can access custom curricula, flexible online training, and an admin dashboard with AI-driven analytics to track learner progress.
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