When comparing Khan Academy vs exercism.org, the Slant community recommends exercism.org for most people. In the question“What are the best websites to learn to code?” exercism.org is ranked 2nd while Khan Academy is ranked 12th. The most important reason people chose exercism.org is:
Rather than merely test for code correctness, Exercism uses peer review to improve general programming techniques. Users are encouraged to comment on others' solutions, and refine their own based on feedback.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free
Khan Academy is 100% free and does not require you to sign up in order to access the courses.
Pro Motivation through gamification
Users collect badges and points through completing missions, watching videos, adding comments and more.
Pro Q & A Section
There is a Q & A section after every video where you can ask questions there and let other users answer them.

Pro Human review and feedback
Rather than merely test for code correctness, Exercism uses peer review to improve general programming techniques. Users are encouraged to comment on others' solutions, and refine their own based on feedback.

Pro Practice with production tools
Unlike many code practice websites, Exercism requires the user to develop and test entirely offline, submitting only the finished code. This promotes familiarity with essential tools and workflow, not just the bare language.
Cons
Con Limited programming courses
The programming courses are not in-depth, giving students only a basic knowledge of programming. The language choices are also limited (HTML, CSS and JavaScript).

Con Custom commandline client
Exercism requires using a CLI utility to fetch and submit exercises. This is inconvenient compared to web-only alternatives, and poses an additional barrier to entry for some users.
