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What are the best coding challenge sites?

17

Options
Considered

75

User
Recs.

Jun 8, 2021

Last
Updated

Here’s the Deal

17 Options Considered

Best coding challenge sites	Price	Languages	Features
-- exercism.io	-	scala	Exercises
-- CodinGame	-	-	-
-- Codewars	Free	BF / C / C++ / C# / Clojure / CoffeeScript / Crystal / Dart / Elixir / Erlang / F# / Go / Haskel / Java / JavaScript / Lua / Nim / Objective-C / OCaml / PHP / Python / R / Ruby / Rust / Shell / SQL / Swift / TypeScrypt	-
-- CheckiO	-	-	-
-- HackerRank	-	-	-

exercism.io

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Top Pro

Human review and feedback

Rather than merely test for code correctness, Exercism uses peer review to improve general programming techniques. Users are encouraged to comment on others' solutions, and refine their own based on feedback. See More

Top Con

Custom commandline client

Exercism requires using a CLI utility to fetch and submit exercises. This is inconvenient compared to web-only alternatives, and poses an additional barrier to entry for some users. See More

IndustriousRaedieahkka's Experience

Specs

Languages:scala

Features:Exercises

Top Pro

Practice with production tools

Unlike many code practice websites, Exercism requires the user to develop and test entirely offline, submitting only the finished code. This promotes familiarity with essential tools and workflow, not just the bare language. See More

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Codewars

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Top Pro

Compare, and learn new tricks after the round

After your war, you will be able to see your code in comparison with your opponent's. If their solution was better than yours, you can learn from their code and next time adapt it into your code if you like it. It's a fantastic, fun way to learn among peers. See More

Top Con

Website is extremely slow for non-subscribers

SophisticatedXiwangmu's Experience

I don't recommend codewars if you have some sort of "professional" approach. the whole site and concept is buggy and full of glitches and therefore it is time consuming and bit stressful (you won't receive the right amount of points, getting randomly logged out, slow, ...) what I miss most is to "brag" about your achievements. there is no public rank breakdown for the different languages. but if you just looking for a fun way to learn new concepts and train your skills it might be the right choice See More

Specs

Languages:BF / C / C++ / C# / Clojure / CoffeeScript / Crystal / Dart / Elixir / Erlang / F# / Go / Haskel / Java / JavaScript / Lua / Nim / Objective-C / OCaml / PHP / Python / R / Ruby / Rust / Shell / SQL / Swift / TypeScrypt

Top Pro

Can choose challenges by type or by difficulty

Top Con

Sometimes buggy challenges

Often translated to another language, challenges have glitches and sometimes, correct solutions cannot pass tests. Challenge/translation approval process is too relaxed and stimulates quantity rather than quality. See More

Top Pro

Multi-language support

Users can complete code challenges in over 12 different languages. See More

Top Pro

Learning gamification

Get points and increase your level by completing coding challenges. See More

Top Pro

Free

Codewars is completely free to use. See More

CheckiO

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Top Pro

Community backed solution reviews

Users can publish their solutions for different problems and other users can review the code and give their opinions on how they would have solved the problem. Sometimes, some of the most active users get their code reviewed by Guido Van Rossum (the creator of the Python language) himself. See More

Top Con

Not for absolute beginners

CheckiO does not teach syntax, instead it teaches how to solve problems using a particular programming language therefore some basic programming knowledge is required to start. See More

Top Pro

Available in multiple languages

CheckiO crowdsources translations for problems. Currently problems have been translated in 10 languages. So it's highly possible that eventually more languages will be supported. See More

Top Pro

Ability to create new challenges

New missions can be created and uploaded using GitHub. After that is done, it's suggested to CheckiO and if it fills all the requirements after being reviewed by a CheckiO team member, it's pulled into the game. See More

Top Pro

Challenges from GitHub, O'Reilly, Dropbox and Hubspot.

HackerRank

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IndustriousRaedieahkka's Experience

Codeforces

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Edabit

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Top Con

Unresponsive developer

Developer doesn't respond to email. See More

Top Pro

Beginner friendly

CalmLugalIrra's Experience

Beginner friendly See More

Specs

Languages:C++, C#, JavaScript, PHP, Python, Java, Ruby, Swift

Top Con

Bug

It's possible to submit an incorrect answer to a challenge, when user should have received a console error instead (with the button to complete the challenge greyed out). See More

Top Pro

Very addictive

Users gain XP for every challenge they complete, can unlock achievements and climb the global leaderboard. This provides the user with a genuine sense of progression as their skillset increases. See More

SophisticatedXiwangmu's Experience

great for absolute beginners. allows a steep learning curve. and you can learn from other students! See More

Top Pro

Get instant feedback

Users can start coding immediately while getting instant feedback. If their code works, they pass the challenge. If it doesn't, they fail and must try again. See More

DaringVulturnus's Experience

I was able to submit a completely incorrect solution, with no console/test errors to speak of. I submitted this issue/bug to the developer but have been all but ignored. See More

Top Pro

Learn to think like a programmer

Almost everything relating to learning to code is geared toward only teaching basic syntax. Edabit goes beyond syntax and teaches its users how to think like real programmers (problem solving) in a fun and interactive way. See More

Buster Blue's Experience

It's not great, but it's the best website for coding challenges that I've tried. See More

Battlesnake

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Lytmus

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Top Pro

Allows users to use their own toolset

By using virtual machines, Lytmus allows users to use their own IDEs/TEs and tools. See More

GeeksforGeeks

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Top Pro

Detailed articles for the most important challenges

GeeksForGeeks was founded to create a place for people who want to prepare for job interviews at big tech companies would have a place to prepare for these interviews. The most important challenges and problems get articles published daily on how to solve them with detailed instructions and explanations on the approach taken for solving that particular problem. See More

Screeps

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Code Combat

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Coderbyte

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Codechef

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Top Pro

Large number of languages supported

Codechef supports an impressive number of languages in it's platform. More than 35 languages are supported, all with several problems and challenges and contests. See More

Top Con

Interaction inside the community is limited

The Codechef forums are not very active and they are the official way of interacting inside the Codechef community. Other than the forums, the only way of interacting with other members of the community is through the comment sections of different problems. See More

Top Con

It's young age makes it not popular for recruiters

Codechef is still pretty young especially compared to it's competitors. So it's not very popular with recruiters yet. See More

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