Computer Science / Coding – 40+ UNIQUE Free Educational Websites (Grades K–12)

1. Code.org
URL: https://code.org
Provides free coding courses and activities for K–12 students. Covers block-based and text-based programming. Widely used worldwide.

2. Scratch
URL: https://scratch.mit.edu
Allows students to learn coding through visual programming. Encourages creativity and logical thinking. Ideal for grades 3–8.

3. Blockly Games
URL: https://blockly.games
Uses puzzles to teach programming concepts. Helps transition to text-based coding. Completely free and browser-based.

4. CS Unplugged
URL: https://csunplugged.org
Teaches computer science concepts without computers. Uses activities and games. Suitable for all grade levels.

5. Khan Academy Computing
URL: https://www.khanacademy.org/computing
Offers free lessons on programming and computer science. Covers JavaScript, HTML, and algorithms. Suitable for middle and high school.

6. MIT App Inventor
URL: https://appinventor.mit.edu
Allows students to build mobile apps visually. Encourages problem-solving and creativity. Free to use.

7. CodeCombat Free Levels
URL: https://codecombat.com
Teaches programming through game-based learning. Supports Python and JavaScript. Suitable for upper elementary and middle school.

8. Tynker Free Activities
URL: https://www.tynker.com
Provides free coding activities and puzzles. Uses block-based and text coding. Engaging for younger learners.

9. Micro:bit Classroom
URL: https://classroom.microbit.org
Teaches coding with physical computing concepts. Includes free lessons and simulations. Suitable for grades 5–12.

10. Coding for Kids
URL: https://www.codingforkids.com
Offers free beginner coding tutorials. Focuses on logic and problem-solving. Suitable for elementary students.

11. W3Schools
URL: https://www.w3schools.com
Provides free tutorials on web development. Covers HTML, CSS, JavaScript, and more. Suitable for secondary students.

12. FreeCodeCamp
URL: https://www.freecodecamp.org
Offers free interactive coding lessons. Covers web development and programming basics. Suitable for older students.

13. CS First by Google
URL: https://csfirst.withgoogle.com
Provides free computer science curriculum. Uses Scratch-based lessons. Designed for students ages 9–14.

14. Lightbot
URL: https://lightbot.com
Uses puzzles to teach coding logic. Focuses on sequencing and loops. Suitable for beginners.

15. Alice
URL: https://www.alice.org
Teaches programming through 3D animations. Helps understand object-oriented concepts. Suitable for middle and high school.

16. OpenProcessing
URL: https://www.openprocessing.org
Supports creative coding and visual arts programming. Uses Processing language. Suitable for advanced students.

17. CodeHS Free Content
URL: https://codehs.com
Provides free coding lessons and practice. Covers multiple programming languages. Suitable for middle and high school.

18. Teach Computing
URL: https://teachcomputing.org
Offers free computer science lesson resources. Aligned with school curricula. Suitable for K–12.

19. Python Tutor
URL: https://pythontutor.com
Helps students visualize code execution. Supports Python and other languages. Great for beginners.

20. Replit Learn
URL: https://replit.com/learn
Offers free coding tutorials. Allows coding directly in the browser. Suitable for beginners.

21. CS50 OpenCourseWare
URL: https://cs50.harvard.edu/x
Provides free introductory computer science course. Includes videos and problem sets. Suitable for high school students.

22. Code Maven
URL: https://code-maven.com
Offers free programming tutorials. Covers Python and automation basics. Suitable for secondary students.

23. Codingame Free Practice
URL: https://www.codingame.com
Uses puzzles and challenges to teach coding. Engaging and interactive. Suitable for older students.

24. Algorithm Visualizer
URL: https://algorithm-visualizer.org
Visualizes data structures and algorithms. Helps students understand abstract concepts. Suitable for high school.

25. Project Euler
URL: https://projecteuler.net
Provides free mathematical programming challenges. Encourages logical thinking. Suitable for advanced students.

26. Mozilla Developer Network
URL: https://developer.mozilla.org
Offers free web development documentation. Covers HTML, CSS, and JavaScript. Suitable for high school learners.

27. Coding Rooms Free
URL: https://codingrooms.com
Provides free coding practice environments. Supports classroom learning. Suitable for secondary students.

28. Code.org App Lab
URL: https://code.org/educate/applab
Allows students to create apps using JavaScript. Free and beginner-friendly. Suitable for middle school.

29. Swift Playgrounds
URL: https://www.apple.com/swift/playgrounds
Teaches coding using Swift language. Interactive and visual. Suitable for beginners.

30. Grasshopper Coding
URL: https://grasshopper.app
Uses puzzles to teach JavaScript basics. Free and engaging. Suitable for beginners.

31. Open Source Computer Science
URL: https://github.com/ossu/computer-science
Provides free CS curriculum resources. Curated learning path. Suitable for advanced learners.

32. CS Field Guide
URL: https://csfieldguide.org.nz
Provides free CS concepts explanations. Includes interactive activities. Suitable for secondary students.

33. Hackety Hack
URL: https://hackety.com
Introduces programming concepts through Ruby. Designed for beginners. Free to use.

34. Kodable Free Levels
URL: https://www.kodable.com
Teaches programming logic to young learners. Uses games and puzzles. Suitable for grades K–5.

35. Invent with Python
URL: https://inventwithpython.com
Provides free Python programming books. Suitable for beginners and students. Easy to understand.

36. Code.org Game Lab
URL: https://code.org/educate/gamelab
Teaches coding through game creation. Uses JavaScript. Suitable for middle school.

37. Processing.org
URL: https://processing.org
Supports creative coding for art and visuals. Open-source and free. Suitable for advanced learners.

38. CS Awesome
URL: https://www.csawesome.org
Provides free AP Computer Science resources. Covers Java programming. Suitable for high school.

39. Coursera Free CS Courses
URL: https://www.coursera.org
Offers free access to selected computer science courses. Audit option available. Suitable for older students.

40. Coding with Kids
URL: https://codingwithkids.com
Provides free beginner coding lessons. Focuses on fundamentals. Suitable for elementary students.

41. Gamefroot
URL: https://gamefroot.com
Allows students to design games visually. Encourages logic and creativity. Free basic access.

42. Thunkable
URL: https://thunkable.com
Allows app creation with block-based coding. Free tier available. Suitable for beginners.

43. Computer Science Online
URL: https://www.computerscienceonline.org
Provides free CS learning resources. Covers basics and career info. Suitable for high school.

44. Code.org Sprite Lab
URL: https://code.org/educate/spritelab
Allows students to create animations and stories. Beginner-friendly coding environment. Suitable for younger learners.

45. AI for Kids
URL: https://www.aiforkids.com
Introduces artificial intelligence concepts to students. Uses simple explanations and activities. Suitable for middle school.

46. CS Education Research
URL: https://cseresearch.org
Provides free CS learning resources. Focuses on pedagogy and student understanding. Suitable for educators and students.