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

HackerRank
LeetCode
CodeSignal
CodinGame
Coderbyte
Project Euler
Topcoder
Sphere Online Judge created for the coders' community to train, to learn and to make progress.
Which is more popular?
Based on our record, Codewars seems to be a lot more popular than Spoj. While we know about 160 links to Codewars, we've tracked only 2 mentions of Spoj.
Website, pricing, platforms and company facts side by side.
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| Website | codewars.com | spoj.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 Spoj yet.
Walkthroughs and reviews on video.
Codewars Review & Tips
More videos
WHY SPHERE ONLINE JUDGE (SPOJ) IS GREAT
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Codewars and Spoj. 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...
Sphere Online Judge (SPOJ) is an online judge that provides over 20k coding challenges. You are able to submit your code in an online editor. SPOJ also hosts their own contests and has an area for users to discuss...
Best qualities: SPOJ has tons of mind-boggling coding challenges that will really test your skills. There are contests as well for you to participate in to showcase your skills.
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
Before Timsort, I knew of Tim some 20 years ago from the ranking and online forum of SPOJ[1], a Polish competitive programming website where he always seemed to top the speed leaderboards with unorthodox usage of Python. He's... - Source: Hacker News / about 2 years ago
Have you looked at spoj.com? It has a fair amount of different problems, some of them are pretty creative, you can take an inspiration from that. Source: over 5 years ago
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