
Brilliant.org
EloMath
Khan Academy
Numberthon
Project Euler
LeetCode
mathigon
Practice olympiad-style math problems and compete against other users.
VS Code
CodePen
GitHub
Node.js
RegExr
JSFiddle
CodeSandbox
Free ebook for the JS Beginners

Which is more popular?
Based on our record, Eloquent JavaScript seems to be more popular. It has been mentioned 218 times since March 2021.
Website, pricing, platforms and company facts side by side.
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EJS
Eloquent JavaScript
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| Website | calcora.net | eloquentjavascript.net |
| Pricing | ||
| Platforms | — | |
| Company | Startup from Switzerland · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.

Calcora is a free platform for practicing math problems of all difficulty levels. Solve problems, maintain your streak, and compete with friends on the leaderboard. The Rules No Calculator. Solve every problem by hand. Mental math and working on paper are part of the challenge. No AI Assistance....
No description of Eloquent JavaScript yet.
What each product offers, as listed by its team.

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

Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
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Eloquent JavaScript A Modern Introduction to Programming 3rd Edition by Marijn Haverbeke review
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Calcora.net and Eloquent JavaScript. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Tracking Calcora.net since Mar 2026.
If you haven’t read Eloquent JavaScript , go check it out. It’s one of my all-time favourite programming books — hands down. - Source: dev.to / about 1 year ago
Videos, blogs, text-based teachings, YouTube project-based learning, books, and the like are all examples of various methods and mediums of acquiring skills, especially in the software engineering industry. As I continue to navigate... - Source: dev.to / almost 2 years ago
Seconded. I won't recommend it and no one I know has recommended it for a decade. It's hard for someone who doesn't know JS to know which parts has changed and is no longer the way to do things. https://github.com/getify/You-Dont-Know-JS... - Source: Hacker News / about 2 years ago
When comparing Calcora.net and Eloquent JavaScript, you can also consider the following products.

Brilliant - Understand concepts and build your problem solving skills with thousands of free problems and examples in math, science, and engineering.
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Build and debug modern web and cloud applications, by Microsoft
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Improve math skills with ranked practice, Elo-style ratings, topic lessons, timed challenges, progress stats, rewards, and a global leaderboard.
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A front end web development playground.
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Khan Academy offers online tools to help students learn about a variety of important school subjects. Tools include videos, practice exercises, and materials for instructors. Read more about Khan Academy.
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Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
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