Best Coding Challenge Platforms in 2026
Updated
In short: CodeSignal is ranked #1 of 30 as of 4 October 2026, ahead of Eolymp and HackerRank. The best-ranked option with a free plan is Eolymp. The lowest first paid tier on this page is CSSBattle at $4.90/mo.
Practice problems, candidate evaluations, and coding exercises can call for different kinds of challenge platforms. Compare primary use, supported languages, and problem library size to understand the available practice material; solution explanations and custom challenges add further points to weigh. For hiring workflows, check company assessments. CodeSignal, Eolymp, and HackerRank are among the entries to consider across these needs. Free-plan availability and paid-from pricing offer cost context, while the listed features help distinguish platforms intended for practice from those that also support candidate evaluation. Consider what languages and challenge formats matter for your own learning or assessment work.
30 coding challenge platforms ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
30ranked
11free plans on this page
$4.90/molowest paid tier
4 Oct 2026last checked
Input list Coding Challenge Platforms 25 channels on this page · 74 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromPrimary useLanguages supportedProblem library sizeSolution explanationsCustom challengesCompany assessments Spec sheet Score
01 CodeSignal Free planYesPaid from$79/moPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 2/8spec lines stated 7.3
02 Eolymp Free planNoPaid fromnot statedPrimary usepracticeLanguages supportedC++, Python, Java, Go, Pascal, Haskell, Lisp, Assembly, PHP, JavaScript, C#Problem library sizenot statedSolution explanationsYesCustom challengesYesCompany assessmentsnot stated 5/8spec lines stated 7.3
03 HackerRank Free planNoPaid from$165/moPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 2/8spec lines stated 7.2
04 DMOJ Free plannot statedPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 0/8spec lines stated 7.1
05 GeeksforGeeks Practice Free planYesPaid fromnot statedPrimary usepracticeLanguages supportedC, C++, Java, Python, JavaScript, C#Problem library size2,518 problemsSolution explanationsYesCustom challengesnot statedCompany assessmentsYes 6/8spec lines stated 7.1
06 HackerEarth Assessments Free planYesPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 7.1
07 Edabit Free planYesPaid fromnot statedPrimary usepracticeLanguages supportedC#, C++, Java, JavaScript, PHP, Python, Ruby, SwiftProblem library size17,000 problemsSolution explanationsYesCustom challengesnot statedCompany assessmentsnot stated 5/8spec lines stated 7.0
08 AtCoder Free planYesPaid fromnot statedPrimary usecontestsLanguages supportedC, 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 size5,000 problemsSolution explanationsYesCustom challengesnot statedCompany assessmentsnot stated 5/8spec lines stated 6.9
09 CodingBat Free planYesPaid fromnot statedPrimary usepracticeLanguages supportedJava, PythonProblem library sizenot statedSolution explanationsYesCustom challengesYesCompany assessmentsnot stated 5/8spec lines stated 6.9
10 CSSBattle Free planYesPaid from$4.9/moPrimary usepracticeLanguages supportedHTML, CSSProblem library size1,100 problemsSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 5/8spec lines stated 6.9
11 Yandex Contest Free planYesPaid fromnot statedPrimary usecontestsLanguages supportedBash, 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 size80,000 problemsSolution explanationsnot statedCustom challengesYesCompany assessmentsYes 6/8spec lines stated 6.9
12 beecrowd Free planYesPaid fromnot statedPrimary usepracticeLanguages supportedPython, Ruby, C#, Scala, Lua, JavaScript, C, Kotlin, C++, Haskell, OCaml, Pascal, Java, Dart, R, PHP, Swift, Clojure, Rust, Elixir, SQLProblem library sizenot statedSolution explanationsnot statedCustom challengesYesCompany assessmentsYes 5/8spec lines stated 6.8
13 Codeforces Free planYesPaid fromnot statedPrimary usecontestsLanguages supportedC, C++, C#, D, Delphi, F#, Free Pascal, Go, Haskell, Java, JavaScript, Kotlin, Node.js, OCaml, PascalABC.NET, Perl, PHP, PyPy, Python, Ruby, Rust, ScalaProblem library sizenot statedSolution explanationsYesCustom challengesYesCompany assessmentsNo 6/8spec lines stated 6.8
14 TestDome Free planNoPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 6.7
15 Coderbyte Free planNoPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 6.6
16 Qualified Free planNoPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 6.5
17 AlgoExpert Free plannot statedPaid fromnot statedPrimary useinterviewsLanguages supportedJavaScript, TypeScript, Python, Swift, Kotlin, C++, Java, C#, GoProblem library size160 problemsSolution explanationsYesCustom challengesnot statedCompany assessmentsnot stated 4/8spec lines stated 6.4
18 NextJudge Free plannot statedPaid fromnot statedPrimary usecontestsLanguages supportedC++, C, Python, PyPy, Java, JavaScript, TypeScript, Go, Rust, Ruby, Lua, Kotlin, HaskellProblem library sizenot statedSolution explanationsnot statedCustom challengesYesCompany assessmentsnot stated 3/8spec lines stated 6.3
19 LeetCode Free planYesPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 6.1
20 Codility Free planNoPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 5.9
21 SQLZoo Free planYesPaid fromnot statedPrimary usepracticeLanguages supportedSQL Server, Oracle, MySQL, DB2, Mimer, PostgreSQL, SQLite, AccessProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsNo 4/8spec lines stated 5.7
22 CodeChef IDE Free planYesPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 5.6
23 DOMjudge Free planYesPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 5.6
24 CheckiO Free planYesPaid from$4.99/moPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 2/8spec lines stated 5.4
25 Kattis Free planYesPaid fromnot statedPrimary usenot statedLanguages supportednot statedProblem library sizenot statedSolution explanationsnot statedCustom challengesnot statedCompany assessmentsnot stated 1/8spec lines stated 5.4
Compare all 25 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Primary use | Languages supported |
|---|---|---|---|---|---|---|---|---|
| 1 | CodeSignal | 7.3 | Free plan | $24.99/mo | Yes | 79 /mo | — | — |
| 2 | Eolymp | 7.3 | Free plan | Free | No | — | practice | C++, Python, Java, Go, Pascal, Haskell, Lisp, Assembly, PHP, JavaScript, C# |
| 3 | HackerRank | 7.2 | No | $165/mo | No | 165 /mo | — | — |
| 4 | DMOJ | 7.1 | Free plan | Free | — | — | — | — |
| 5 | GeeksforGeeks Practice | 7.1 | No | — | Yes | — | practice | C, C++, Java, Python, JavaScript, C# |
| 6 | HackerEarth Assessments | 7.1 | Free plan | Free | Yes | — | — | — |
| 7 | Edabit | 7.0 | Free plan | Free | Yes | — | practice | C#, C++, Java, JavaScript, PHP, Python, Ruby, Swift |
| 8 | AtCoder | 6.9 | Free plan | Free | Yes | — | contests | 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 IR |
| 9 | CodingBat | 6.9 | Free plan | Free | Yes | — | practice | Java, Python |
| 10 | CSSBattle | 6.9 | Free plan | $4.90/mo | Yes | 4.9 /mo | practice | HTML, CSS |
| 11 | Yandex Contest | 6.9 | Free plan | Free | Yes | — | contests | 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, TypeScript |
| 12 | beecrowd | 6.8 | Free plan | Free | Yes | — | practice | Python, Ruby, C#, Scala, Lua, JavaScript, C, Kotlin, C++, Haskell, OCaml, Pascal, Java, Dart, R, PHP, Swift, Clojure, Rust, Elixir, SQL |
| 13 | Codeforces | 6.8 | Free plan | Free | Yes | — | contests | 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 |
| 14 | TestDome | 6.7 | No | — | No | — | — | — |
| 15 | Coderbyte | 6.6 | No | $99/mo | No | — | — | — |
| 16 | Qualified | 6.5 | No | — | No | — | — | — |
| 17 | AlgoExpert | 6.4 | No | $9.92/mo | — | — | interviews | JavaScript, TypeScript, Python, Swift, Kotlin, C++, Java, C#, Go |
| 18 | NextJudge | 6.3 | No | — | — | — | contests | C++, C, Python, PyPy, Java, JavaScript, TypeScript, Go, Rust, Ruby, Lua, Kotlin, Haskell |
| 19 | LeetCode | 6.1 | No | — | Yes | — | — | — |
| 20 | Codility | 5.9 | No | — | No | — | — | — |
| 21 | SQLZoo | 5.7 | No | — | Yes | — | practice | SQL Server, Oracle, MySQL, DB2, Mimer, PostgreSQL, SQLite, Access |
| 22 | CodeChef IDE | 5.6 | No | — | Yes | — | — | — |
| 23 | DOMjudge | 5.6 | No | — | Yes | — | — | — |
| 24 | CheckiO | 5.4 | No | — | Yes | 4.99 /mo | — | — |
| 25 | Kattis | 5.4 | No | — | Yes | — | — | — |
Is your tool on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which coding challenge platform is ranked first on Specifiction?
CodeSignal is ranked #1 of 30 with a score of 7.3. Eolymp is second and HackerRank third.
How many of these have a free plan?
11 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, CSSBattle has the lowest first paid tier we found: $4.90/mo.
How is this list ranked?
Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.