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Head-to-head · Coding Challenge Platforms

Codeforces vs AtCoder

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Codeforces #4 in Coding Challenge Platforms 8.9/10 Free plan Free plan✓ 2 of 3 features Visit Codeforces
AtCoder #5 in Coding Challenge Platforms 8.8/10 Free plan Free plan✓ 1 of 3 features Visit AtCoder

Codeforces leads on 0 checks, AtCoder on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreCodeforces · 8.9/10
  • Free planboth
  • Most featuresCodeforces · 2 of 3

Codeforces scores higher on our rubric for coding challenge platforms: 8.9 against 8.8 out of 10; our editors rank them #4 and #5.

Codeforces is the better fit for serious competitive programming contests. AtCoder is the better fit for algorithm and optimization contests.

  • Codeforces fits best

    Serious competitive programming contests

  • AtCoder fits best

    Algorithm and optimization contests

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Side by side

Feature Codeforces 8.9/10 Visit ↗ AtCoder 8.8/10 Visit ↗
At a glance
Editor score 8.9 8.8
Ranking #4 in Coding Challenge Platforms #5 in Coding Challenge Platforms
Best for Serious competitive programming contests Algorithm and optimization contests
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud Cloud
Platforms Web Web
Support Docs Tickets, Docs
Built for Solo, Small business Solo, Small business, Mid-market, Enterprise
Features Codeforces 2/3 · AtCoder 1/3
Solution explanations ✓ ✓
Custom challenges ✓ (best) Not checked yet
Company assessments — Not checked yet
Specs
Primary use Contests Contests
Languages 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 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, Octave, SageMath, Mercury, Pony, Brainfuck, APL, AWK, BASIC, Assembly, Befunge93, Piet
Problem library size Not checked yet 5000 problems
Our review
Pros
  • Free timed contests with ratings, divisions, and virtual participation
  • Searchable problemset with difficulty ratings, tags, and solution explanations
  • Automated judging, custom tests, Gym contests, and a public API
  • Free timed algorithm and heuristic contests
  • More than 5,000 archived problems with official editorials
  • Supports many programming languages and rating systems
Cons
  • Platform coverage is limited to the web and API
  • Not designed for company assessments
  • The published language and compiler list may change over time
  • Primarily focused on contests rather than broader coding workflows
  • Web-only access limits platform flexibility
  • Recruitment and assessment services are separate products
Our verdict

Codeforces is a web-based competitive programming platform for people who practice algorithmic problem solving and enter timed programming contests. Its core offering includes regularly scheduled contests, a searchable problemset with…

Read the review →

AtCoder is a browser-based competitive programming platform for people who want structured algorithm and optimization contests. Operated by AtCoder Inc., it hosts beginner, regular, grand and heuristic formats, with timed submissions…

Read the review →
  1. CodeforcesCoding Challenge Platforms 8.9Free plan
  2. AtCoderCoding Challenge Platforms 8.8Free plan

Strengths and trade-offs

  • Codeforces — where it wins

    • Free timed contests with ratings, divisions, and virtual participation
    • Searchable problemset with difficulty ratings, tags, and solution explanations
    • Automated judging, custom tests, Gym contests, and a public API

    Where it doesn't

    • Platform coverage is limited to the web and API
    • Not designed for company assessments
    • The published language and compiler list may change over time

  • AtCoder — where it wins

    • Free timed algorithm and heuristic contests
    • More than 5,000 archived problems with official editorials
    • Supports many programming languages and rating systems

    Where it doesn't

    • Primarily focused on contests rather than broader coding workflows
    • Web-only access limits platform flexibility
    • Recruitment and assessment services are separate products

More comparisons

All coding challenge platforms comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update