
LeetCode
HackerRank
Codewars
Codechef
Topcoder
Edabit
Spoj
AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online.

LeetCode
CSSBattle
Exercism
CodeSignal
HackerRank
Codewars
Coderbyte
Explore and attempt front-end coding challenges.

Which is more popular?
Based on our record, Codier seems to be more popular. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | atcoder.jp | codier.io |
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What each product offers, as listed by its team.


No features have been listed yet.
Possible disadvantages
Walkthroughs and reviews on video.
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Kufatec Codier-Dongle / Active Lane + Dynamic Light Assist - Das Golf 7 Projekt #3
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How often each product is chosen within a category, 0–100% relative to the other.


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


Tracking AtCoder since Oct 2026.
2.Codier This is also same a before but little different like you can view the other developers solution and task are very little and large also. Https://codier.io/. - Source: dev.to / almost 4 years ago
Codier is the free platform where each project you choose has instructions that you must follow and once you completed the project, you can submit your solution and others could rate it. Codier. - Source: dev.to / over 4 years ago
When comparing AtCoder and Codier, you can also consider the following products.

Practice and level up your development skills and prepare for technical interviews.
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HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
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Download and solve practice problems in over 30 different languages.
Compare Exercism to AtCoder or Codier:

CodeChef is a not-for-profit educational initiative by Directi, an Indian software company. It is a global programming community that fosters learning and friendly competition, built on top of the world’s largest competitive programming platform.
Compare Codechef to AtCoder or Codier: