16 Great Websites to Test Code Online in 2023

1. CodePen

CodePen is a popular playground for front-end developers, offering an interactive environment to build and test HTML, CSS, and JavaScript code snippets.

2. Replit

Replit provides a collaborative coding platform with support for multiple languages, making it ideal for pair programming and learning.

3. JSFiddle

JSFiddle specializes in web development, allowing developers to create and share web code in real-time, making it great for rapid prototyping.

4. StackBlitz

Focused on Angular and React development, StackBlitz offers a feature-rich online IDE with instant previews and collaboration options.

5. GitHub Gist

GitHub Gist lets you share code snippets, making it perfect for quick sharing and collaboration.

6. Coding Ground

Coding Ground supports numerous programming languages and offers an integrated development environment for testing and practicing code.

7. HackerRank

HackerRank is well-known for its coding challenges and competitions, helping developers enhance their problem-solving skills.

8. LeetCode

LeetCode is a fantastic platform to practice coding problems, particularly for job interview preparation in tech companies.

9. OnlineGDB

OnlineGDB is an integrated development environment supporting multiple languages, complete with debugging features.

10. Paiza.IO

Paiza.IO provides an online coding environment with a focus on simplicity and ease of use.

11. Ideone

Ideone supports over 60 programming languages and offers features like syntax highlighting and code execution.

12. JDoodle

JDoodle is a versatile online compiler supporting an extensive range of languages and offering collaborative coding options.

13. Codewars

Codewars turns coding practice into a game, offering challenges in various languages to improve your coding skills.

14. CoderPad

CoderPad is designed for technical interviews, enabling candidates and interviewers to collaboratively code and assess skills.

15. Collabedit

Collabedit is a simple platform focused on collaborative code editing in real-time.

16. Codingame

Codingame combines coding challenges with gaming, making it an engaging platform for learning and honing programming skills.

Features and Benefits of Each Platform

Each of these online code testing platforms comes with its own set of features and benefits. Some emphasize specific programming languages or frameworks, while others are more general-purpose. Depending on your needs, you can choose platforms that offer instant feedback, collaborative coding, problem-solving challenges, or a combination of these features.

How to Choose the Right Platform for You

Selecting the right online code testing platform depends on your goals and preferences. Consider the languages you’re working with, the level of collaboration you require, and whether you’re looking for focused practice or broader skill enhancement. Take advantage of free trials or basic versions to explore each platform’s features before committing.


Online code testing platforms have transformed the way developers experiment, learn, and collaborate. With an array of options available, you’re empowered to choose the platform that best aligns with your coding journey. Whether you’re refining your skills, preparing for interviews, or simply exploring new languages, these platforms are your gateway to a more efficient and dynamic coding experience.


  1. Q: Are these online code testing platforms suitable for beginners? A: Yes, many platforms offer beginner-friendly interfaces and tutorials to help newcomers get started.
  2. Q: Do I need to install anything to use these platforms? A: Most of these platforms are web-based, requiring no installations. Some might offer browser extensions for added convenience.
  3. Q: Can I collaborate with others on these platforms? A: Absolutely, many platforms provide collaborative coding features, allowing you to work on projects with others in real-time.
  4. Q: Are there any platforms focused specifically on competitive coding? A: Yes, platforms like HackerRank, LeetCode, and Codewars offer coding challenges and competitions to improve problem-solving skills.
  5. Q: Are these platforms free to use? A: Many platforms offer free versions with limited features, and some have premium subscription options for access to advanced functionalities.
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