When comparing SnoopCode 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 SnoopCode is ranked 55th. 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 GIF videos for every topic
GIFs are used to show the student how the code changes the project, helping to clearly explain and demonstrate the topic being taught.
Pro Live code editors with instant previews
Live code editors are available for HTML, CSS, JavaScript, jQuery, with preview windows that update instantly.
Pro Built-in editor
Snoopcode offers built-in editors throughout the lessons for practicing code.
Pro Interactive tutorials
Each topic has interactive tutorials that include GIFs, examples, and built-in code editors.
Pro Great source for reference
This website has very handful references for the web development languages like HTML, CSS, JavaScript and JQuery!!!
Best thing is tutorials, reference, GIF's and live code editors are available at one place. Thanks to SnoopCode.com for coming out with different approach for learning Web Development.

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 number of languages are offered
Currently Snoopcode only offers HTML, CSS, JavaScript and jQuery.

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.
