Best Coding Challenge Platforms in 2026
Updated
In short: CodeSignal is ranked #1 of 30 as of 4 October 2026, ahead of GeeksforGeeks Practice and LeetCode. The best-ranked option with a free plan is Edabit. The lowest first paid tier on this page is CodeSignal at $24.99/mo.
Whether you’re learning to code or looking for candidate assessments, these platforms offer different ways to work through programming problems. Compare primary use, supported languages, and problem library size; solution explanations and custom challenges add other points to consider. For hiring, check company assessment features, and review free plans and paid starting prices. GeeksforGeeks Practice, CodeSignal, and Codeforces lead the ranking, followed by AtCoder and Yandex Contest. The details can help you find an option suited to your goals, whether that means practicing particular languages or evaluating coding skills.
30 coding challenge platforms ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 1 CodeSignal iPhone + Android RecognisedPhone appDocumentedFree plan 7.8$24.99/mo
- 2 GeeksforGeeks Practice iPhone + Android RecognisedPhone appDocumentedFree plan 7.4 Primary use: practiceLanguages supported: C, C++, Java, Python, JavaScript, C#Problem library size: 2,518 problems
- 3 LeetCode iPhone + Android RecognisedPhone appDocumentedFree plan 6.8
- 4 Edabit No phone app RecognisedPhone appDocumentedFree plan 6.4Free Primary use: practiceLanguages supported: C#, C++, Java, JavaScript, PHP, Python, Ruby, SwiftProblem library size: 17,000 problems
- 5 AtCoder No phone app RecognisedPhone appDocumentedFree plan 6.3Free Primary use: contestsLanguages supported: C, C++, C#, Java, Python, Rust, Ruby, Go, Kotlin, Swift, JavaScript, TypeScript, PHP, Perl, Lua, Scala, Haskell, OCaml, Nim, Pascal, R, SQL, Prolog, PowerShell, Bash, Fortran, COBOL, Julia, Dart, Elixir, Erlang, F#, D, Crystal, Clojure, Common Lisp, Scheme, Visual Basic, Lean, LLVM IRProblem library size: 5,000 problems
- 6 beecrowd No phone app RecognisedPhone appDocumentedFree plan 6.3Free Primary use: practiceLanguages supported: Python, Ruby, C#, Scala, Lua, JavaScript, C, Kotlin, C++, Haskell, OCaml, Pascal, Java, Dart, R, PHP, Swift, Clojure, Rust, Elixir, SQL
- 7 Codeforces No phone app RecognisedPhone appDocumentedFree plan 6.3Free Primary use: contestsLanguages supported: C, C++, C#, D, Delphi, F#, Free Pascal, Go, Haskell, Java, JavaScript, Kotlin, Node.js, OCaml, PascalABC.NET, Perl, PHP, PyPy, Python, Ruby, Rust, Scala
- 8 CodingBat No phone app RecognisedPhone appDocumentedFree plan 6.3Free Primary use: practiceLanguages supported: Java, Python
- 9 Eolymp No phone app RecognisedPhone appDocumentedFree plan 6.3Free Primary use: practiceLanguages supported: C++, Python, Java, Go, Pascal, Haskell, Lisp, Assembly, PHP, JavaScript, C#
- 10 Yandex Contest No phone app RecognisedPhone appDocumentedFree plan 6.3Free Primary use: contestsLanguages supported: Bash, C, C#, C++, Dart, Delphi, D, Free Basic, Free Pascal, Go, Haskell, Java, JavaScript, Kotlin, Kumir, Lua, OCaml, PascalABC.NET, Perl, PHP, Python, R, Ruby, Rust, Scala, Swift, TypeScriptProblem library size: 80,000 problems
- 11 HackerEarth Assessments No phone app RecognisedPhone appDocumentedFree plan 6.1Free
- 12 HackerRank No phone app RecognisedPhone appDocumentedFree plan 5.7$165/mo
- 13 Coderbyte No phone app RecognisedPhone appDocumentedFree plan 5.5$99/mo
- 14 TestDome No phone app RecognisedPhone appDocumentedFree plan 5.5
- 15 Qualified No phone app RecognisedPhone appDocumentedFree plan 5.4
- 16 CSSBattle No phone app RecognisedPhone appDocumentedFree plan 5.3 Primary use: practiceLanguages supported: HTML, CSSProblem library size: 1,100 problems
- 17 AlgoExpert No phone app RecognisedPhone appDocumentedFree plan 5.2 Primary use: interviewsLanguages supported: JavaScript, TypeScript, Python, Swift, Kotlin, C++, Java, C#, GoProblem library size: 160 problems
- 18 CodeChef IDE No phone app RecognisedPhone appDocumentedFree plan 5.2
- 19 Codility No phone app RecognisedPhone appDocumentedFree plan 5.2
- 20 NextJudge No phone app RecognisedPhone appDocumentedFree plan 5.2 Primary use: contestsLanguages supported: C++, C, Python, PyPy, Java, JavaScript, TypeScript, Go, Rust, Ruby, Lua, Kotlin, Haskell
- 21 SQLZoo No phone app RecognisedPhone appDocumentedFree plan 5.2 Primary use: practiceLanguages supported: SQL Server, Oracle, MySQL, DB2, Mimer, PostgreSQL, SQLite, Access
- 22 CheckiO No phone app RecognisedPhone appDocumentedFree plan 5.1
- 23 DOMjudge No phone app RecognisedPhone appDocumentedFree plan 5.1
- 24 Kattis No phone app RecognisedPhone appDocumentedFree plan 5.1
- 25 Topcoder No phone app RecognisedPhone appDocumentedFree plan 5.1
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which coding challenge platform is ranked first on Samsung Mobile US Press?
CodeSignal is ranked #1 of 30 with a score of 7.8. GeeksforGeeks Practice is second and LeetCode third.
How many of these have a free plan?
9 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, CodeSignal has the lowest first paid tier we found: $24.99/mo.
How is this list ranked?
Ranked mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.