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A front end web development playground.

Key CodePen features:

Real-time Collaboration Immediate Visual Feedback Integrated Development Environment (IDE) Community-Driven

Learning has never been this social and accessible for so many!

Key SoloLearn features:

Accessible for Beginners Mobile-Friendly Community Support Variety of Languages

Shared cloud environments for AI coding agents. Run Claude Code, Cursor CLI, Codex, and Gemini CLI from any device, API, or automation tool.

Key CloudCLI features:

Multi-Agent Support Git Integration Persistent Cloud Sessions Web UI & Mobile App

Try for free Open Source paid Free Trial €7.0 / Monthly

Achieve code mastery through challenge.

Key Codewars features:

Wide Range of Challenges User Engagement Multiple Languages Gamification

Open Source

The Topcoder home page has received a slick new makeover that lets new customers quckly login, discover the power of our community, and launch challenges.

Key Topcoder features:

Wide Range of Competitions Global Community Monetary Rewards Skill Development

CodinGame provides users with a fun and effective way to learn coding that eschews the rigid structure of traditional teaching methods.

Key CodinGame features:

Interactive Learning Wide Range of Languages Community Support Skill Assessment

Geektastic is a platform that manages peer reviewed code challenges supported by a community of qualified software engineers.

Key Geektastic features:

High-Quality Assessments Human Code Review Customizable Tests Candidate-Friendly Experience

Project Euler is a series of challenging mathematical/computer programming problems that will...

Key Project Euler features:

Problem-Solving Skills Programming Practice Mathematical Insight Community

Open Source

Download and solve practice problems in over 30 different languages.

Key Exercism features:

Free Access Mentorship Wide Variety of Languages Structured Learning Tracks

Open Source

HackerEarth is the network of top developers across the world. They connect to start-ups, tech companies, organizations and discover the best developer jobs. They participate in programming challenges and compete against other top developers.

Key HackerEarth features:

Diverse Challenge Types Hiring Competitions Community Engagement Comprehensive Analytics

Learn to Code in 90 Days or Less.

Key Edabit features:

Wide Range of Challenges Interactive Learning Community and Collaboration Immediate Feedback

paid Free Trial $120.0 / Annually

Sphere Online Judge created for the coders' community to train, to learn and to make progress.

Key Spoj features:

Variety of Problems Community and Competitions Support for Multiple Languages Rankings and Leaderboards

CodeSignal is the leading assessment platform for technical hiring.

Key CodeSignal features:

Comprehensive Coding Assessments Data-Driven Insights Customizable Tests Real-World Scenarios

CodeChef is a not-for-profit educational initiative by Directi, an Indian software company. It is a global programming community that fosters learning and friendly competition, built on top of the world’s largest competitive programming platform.

Key Codechef features:

Comprehensive Problem Sets Competitive Community Regular Contests Educational Content