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Codeforces

codeforces.com

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Spec score 7.8 #15 of 30 in Coding Challenge Platforms

What it is

Codeforces is a programming-contest community and platform where regular contests give participants a way to solve problems and earn skill ratings. The site says it organizes approximately six contests each month, with free participation open to everybody. In contests following Codeforces rules, participants gain points for solving problems quickly and can test other contestants’ solutions through hacks. Ratings use a modified Elo system, and contestants are split into two divisions. The online judge checks submissions against prepared tests and tests suggested through hacks, then returns a verdict. Past contests are available for practice, while the site says learning content and training features are in development. Codeforces also offers an API that returns some data as machine-readable JSON over HTTP. Public data can be requested anonymously; private user data requires an API key. API requests are limited to one every two seconds, and faster calls receive a call-limit error. The service is free and available on web and through an API.

Spec sheet

API
The API provides some Codeforces data as machine-readable JSON through HTTP requests.Read 29 Sep 2026 · codeforces.com
Security
The privacy policy says the data controller takes appropriate security measures to prevent unauthorized access, disclosure, modification, or destruction of data.Read 29 Sep 2026 · codeforces.com
Account rules
The FAQ says users should not create more than one account and should use the password reminder system if they forget their password.Read 29 Sep 2026 · codeforces.com
API access
API methods can be requested anonymously for public data, while private user data requires an API key.Read 29 Sep 2026 · codeforces.com
API limit
The API allows at most one request every two seconds; faster requests receive a call-limit error.Read 29 Sep 2026 · codeforces.com
Contest format
In Codeforces-rule contests, participants solve problems, receive points for solving quickly, and can test other contestants’ solutions with hacks.Read 29 Sep 2026 · codeforces.com
Contests
The site says it organizes approximately six contests each month and that participation is free and open to everybody.Read 29 Sep 2026 · codeforces.com
Online judge
Solutions are tested on prepared tests or tests suggested through participant hacks, and the system returns verdicts.Read 29 Sep 2026 · codeforces.com
Practice
Past contests are available for preparation, and the site says it is developing learning content and training features.Read 29 Sep 2026 · codeforces.com
Privacy and data
The privacy policy lists cookies, usage data, location, email, names, date of birth, country, city, delivery address, password, and company name among data it may collect.Read 29 Sep 2026 · codeforces.com
Skill ratings
Contest ratings use a modification of the Elo rating system, and contestants are grouped into two divisions.Read 29 Sep 2026 · codeforces.com
What it is
Codeforces is a programming-contest community and platform where contests are held regularly and ratings reflect participants’ skills.Read 29 Sep 2026 · codeforces.com

Plans and prices

Codeforces Free Contest participation is free and open to everybody Read 29 Sep 2026 · codeforces.com

Every Codeforces plan and price →

Strong points and limits

Strong points

  • Approximately six contests each month
  • Contest participation is free and open to everyone
  • Past contests available for practice
  • Supports a broad range of programming languages

Limits

  • API limited to one request every two seconds
  • Private user data requires an API key
  • Learning content and training features are in development

Who it suits

Codeforces suits people who want to compete in programming contests, practice with past problems, or use its API for public data.

Verdict

Codeforces centers on programming contests, ratings, and practice, with an online judge and API access. Contest participation is free, though API requests have a strict rate limit.

Where Specifiction places it

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