
Codecademy
Exercism
Treehouse
edX
LeetCode
Coursera
Pantheon
Achieve code mastery through challenge.

Happycapy
Wordware
Vizzu
Gumloop
Redash
Relay.app
deck.gl
Compose web-ready data transformations, visualizations, and predictions with the ease of drag-and-drop, powerful extensions, and a vibrant community.

Which is more popular?
Based on our record, Codewars seems to be a lot more popular than Hal9. While we know about 160 links to Codewars, we've tracked only 6 mentions of Hal9.
Website, pricing, platforms and company facts side by side.
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| Website | codewars.com | hal9.com |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Codewars is recommended for beginner to advanced programmers who enjoy learning through practice and are interested in improving their algorithmic thinking and coding skills in a gamified environment. It is particularly beneficial for those preparing for coding interviews or seeking to reinforce their programming knowledge in a fun and interactive way.
No analysis of Hal9 yet.
Walkthroughs and reviews on video.
No Hal9 videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Codewars and Hal9. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Edabit offers a learning experience similar to learning a new language, focusing on smaller and more frequent exercises that build proficiency over time. Like Codewars, Edabit provides many challenges that increase in...
In conclusion, while Leetcode remains a valuable resource for coders, the platforms listed above offer varied approaches to learning and improving coding skills. Whether you're drawn to the gamified learning...
This LeetCode alternative has excellent features for anyone looking to sharpen their coding skills. Codewars uses kata, which are small coding exercises that are community developed to help you master your language of...
We have no reviews of Hal9 yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


Recently, I was working on a coding kata on codewars.com. Early on, I started thinking that a potential solution might utilize recursion, a concept that involves a function calling itself. However, I quickly realized that my grasp of... - Source: dev.to / almost 3 years ago
Get more involved. Look into internships and junior SWE positions to get a sample of what you'd be applying for once you graduate. Solve coding challenges, start working on a portfolio of your personal works. I recommend codewars.com for... Source: almost 3 years ago
I'd recommend to play around with some basic coding challenges on leetcode.com or codewars.com. If the course prepared you well you won't find this useful, but playing around with them will make sure that you are comfortable with basics... Source: about 3 years ago
At https://hal9.com, we built components for data science com native JavaScript to avoid the waiting times and download overhead if Pyodide. We found out the best tools for doing data science in the browser are a combination of Arquero... - Source: Hacker News / about 4 years ago
Https://hal9.com helps data scientists build faster web applications. It uses WebGL and WebAssembly to process larger datasets, perform inference in the browser with TensorFlow.js, and enables running Python code with Pyodide. - Source: Hacker News / over 4 years ago
If you want to build a web application on top of your ML project, give https://hal9.com a shot. We designed Hal9 with ease of use for deployment and maximum compatibility with web technologies that enable you to build ML apps with React,... - Source: Hacker News / over 4 years ago
When comparing Codewars and Hal9, you can also consider the following products.

Learn the technical skills you need for the job you want. As leaders in online education and learning to code, we’ve taught over 45 million people using a tested curriculum and an interactive learning environment.
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Download and solve practice problems in over 30 different languages.
Compare Exercism to Codewars or Hal9:


Treehouse is an award-winning online platform that teaches people how to code.
Compare Treehouse to Codewars or Hal9:

Vizzu lets you use animated charts to share insights in complex data sets as self-explanatory stories.
Compare Vizzu to Codewars or Hal9: