JSFiddle is the best code playground for online coding and is used by developers and designers to test and share code snippets.

HackerRank is the market-leading platform for online coding tests, technical interviews, and developer skill assessment for hiring.

Treehouse is an online learning platform offering expert-led video courses for coding, programming, and design, targeting beginners to advanced learners.

Codewars is a coding practice platform where developers achieve mastery through solving programming challenges (kata) in over 55 languages.

HackerEarth is an enterprise-grade online coding platform for technical skill assessment, developer engagement, and streamlined tech recruitment.

Skillcrush is an online coding school offering flexible, project-based courses to help career changers break into tech roles like Developer and Designer.

Tynker is an award-winning online learning platform for K-12 students to learn coding through fun, gamified lessons in block-based, Python, and JavaScript.

CodeCombat is an EdTech company that offers an online coding platform with gamified learning for programming education.

MakeCode is a free online learning platform for coding, enabling users to create games, program hardware like micro:bit, and mod Minecraft.

iD Tech is a STEM education provider for kids and teens offering summer camps and online programs

Flatiron School offers intensive online and on-campus coding bootcamps in Software Engineering, Data Science, Cybersecurity, AI & ML, and UI/UX design.

Codility is an online coding test and technical interview platform for enterprises to assess and hire skilled engineering talent.

Course Report is a directory and review site for coding bootcamps offering alumni reviews, cost comparisons, and career tools to help users choose the right tech school.

Zero To Mastery is an online academy providing career-focused tech education via up-to-date courses, real-world projects, and career roadmaps to help students get hired or promoted.

Edabit is a free online platform offering coding challenges and tutorials for beginners to master programming skills in various languages.

Kodable is an educational platform providing programming and coding games for kids (K-5) to build STEM skills, trusted by educators and parents for at-home and classroom learning.

DIO is an online education platform offering unlimited bootcamps and courses for in-demand tech careers like developer and data science.

BloomTech is an online coding bootcamp offering full-stack web development and AI-integrated tech training with a Tuition Refund Guarantee.

One Month offers beginner-friendly online coding courses in Ruby, Python, JavaScript, and more, designed to teach programming skills in 30 days.

CodeWizardsHQ offers structured, instructor-led online coding classes for kids and teens (ages 8-18) in languages like Python and Java.

GUVI is an online learning platform for coding and tech skills.

Sparta Coding Club is an online coding education platform for programming and data analysis.

PW Skills is an online technology education platform offering in-demand IT training, certification courses, and job assistance for career growth.

Lrnkey is an online tutoring platform connecting learners with global specialists for affordable, interactive one-on-one private lessons across 25+ subjects.