CommentCoder: Learn to Code

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In-app purchases

About this app

Learn to code from scratch with CommentCoder. Discover a concept, put it into practice and move through your learning path, right on your phone.

LEARN BY DOING

New to programming? Start with the basics of Python. Learn to display a message, work with variables and understand how a program works. Courses are organized into chapters and sessions so you can build your knowledge step by step.

PRACTICE WITH MOBILE CODING ACTIVITIES

Complete code by choosing the right elements, put lines in the correct order and find mistakes. Check your understanding with quizzes, matching activities and flashcards. Feedback on your answers helps you understand what you have just learned.

CHOOSE YOUR LANGUAGE

Explore Python, Java and C, or get started with web development through HTML, CSS and JavaScript. Pick a course that fits your goal and return to your learning path in the app.

SEE YOUR PROGRESS

Track completed sessions and your progress through each chapter. Experience points, levels and learning streaks give you milestones as you keep practicing. Learn at your own pace, with the time you have available.

START FOR FREE

Part of the course content is available for free. A Premium subscription gives you access to subscriber-only content. Available plans and terms are shown in the app before you purchase.

Build your understanding of code through regular practice, one exercise at a time.

What’s new

Discover CommentCoder’s refreshed look, with a matching app icon and launch screen.
The English interface is more complete, and legal information links now match your selected language.
This update also improves activity reliability and transitions between sessions.