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

D3.js
Vizzu
Jupyter
Vega-Lite
nivo
Looker
Microsoft Power BI
Interactive code examples/posts

Which is more popular?
Based on our record, Observable should be more popular than Codewars. It has been mentioned 347 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | codewars.com | observablehq.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.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Codewars Review & Tips
More videos
Observable Overview
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Codewars and Observable. 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...
Observable is a Grafana alternative that enables users to visualize data via charts and dashboards using code.
A few options were disregarded from the start due to a hefty price tag, these were Looker, Tableau, Power BI, GoodData. A few options like Trevor.io, Preset, Observable were disregarded as they did not seem to fit our...
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
Holy hell, this is great. I once made a little tool for getting more intuitive spatial scales for things in the universe at https://observablehq.com/@ikesau/scale-to-the-universe I feel like you could do something similar for these sorts... - Source: Hacker News / 22 days ago
Folks may find https://observablehq.com/@fil/poisson-distribution-generators useful. - Source: Hacker News / about 1 month ago
That's because Gaussian splats are ellipses without any texture of their own (more or less), missing any texture that an actual brush stroke would have. Because the ellipses are so elongated in the finer details it feels like layered... - Source: Hacker News / 2 months ago
When comparing Codewars and Observable, 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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D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS.
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Download and solve practice problems in over 30 different languages.
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Vizzu lets you use animated charts to share insights in complex data sets as self-explanatory stories.
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Practice and level up your development skills and prepare for technical interviews.
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Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.
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