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What are the best coding challenge sites?

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14 Options Considered

Best coding challenge sites
PriceLanguagesFeatures
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exercism.io
-Clojure, CoffeeScript, C++, C#, Crystal, Elixir, Java, Elm, Erlang, F#, Go, Haskell, Java, JavaScript, Kotlin, Common Lisp, Lua, Objective-C, Ocaml, Perl 5, PHP, PL/SQL, PureScript, Python, R, Racket, Ruby, Rust, Scala, Scheme, Swift, TypeScriptExercises
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Codewars
FreeBF / C / Clojure / CoffeScript / C++ / Crystal / C# / Dart / Elixir / Erlang / F# / Go / Haskel / Java / JavaScript / Lua / Nim / Objective-C / OCaml / PHP / Python / R / Ruby / Rust / Shell / SQL / Swift / TypeScryptBF / C / Clojure / CoffeScript / C++ / Crystal / C# / Dart / Elixir / Erlang / F# / Go / Haskel / Java / JavaScript / Lua / Nim / Objective-C / OCaml / PHP / Python / R / Ruby / Rust / Shell / SQL / Swift / TypeScrypt
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Edabit
FREEJavaScript, Python, Java, RubyJavaScript, Python, Java, Ruby
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CodinGame
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CheckiO
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exercism.io

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4
Pros
2
Cons
1
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Codewars

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8
Pros
5
Cons
2
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Edabit

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3
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2
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CodinGame

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3
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3
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CheckiO

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5
Pros
4
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1
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Lytmus

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1
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1
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Topcoder

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2
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2
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HackerRank

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Coderbyte

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Codeforces

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GeeksforGeeks

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1
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1
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Codechef

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3
Pros
1
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2
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CareerCup

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2
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2
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Screeps

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