When comparing Platzi 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 Platzi is ranked 25th. 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 Focuses on skill development
Platzi designs their courses in a way that will teach you tangible skills and encourages you to apply them right from the start.
Pro High course adherence
By focusing on teaching tangible skills, Platzi has a 70% adherence rate to their courses compared to the 20% of other online courses.
Pro Live streaming classes
Pro Courses taught by industry leaders
Platzi has a few courses available taught by well known industry leaders such as Y Combinator President Sam Altman.

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 Many courses are only offered in Spanish
Platzi originally launched as Mejorando.la, an educational resource offering all courses in Spanish. They have since rebranded and now offer courses in both English and Spanish, however their English courses are currently still limited.

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.
