18.2
CodeSignal is a skills intelligence platform for organizations that hire, assess, and develop skills, as well as individuals who want to learn through practice.
Free planAndroidiOSWeb
Best Coding Challenge Platforms in 2026
Coding challenge platforms offer programming problems for practice and, in some cases, candidate evaluation. Compare primary use, supported languages, and problem library size to find options that fit the kind of coding work you want to do. Solution explanations can support review, while custom challenges and company assessments may be relevant for creating exercises or evaluating applicants. CodeSignal, Edabit, and…
28.2
HackerEarth Assessments is a hiring assessment service for evaluating candidates across skills and personality.
Free planAndroidiOSWeb
37.4
CodeChef IDE is a browser-based environment for compiling and running code through the CodeChef website.
Free planWebAPI
- 4
HackerRank
WebAPImacOSWindows7.4From $165 a month - 5
Codility
WebAPImacOSWindows7.3From $1,200 a year - 6
CSSBattle
CSSBattle is a web game for practicing HTML and CSS by recreating target images with as few code characters as possible.
Free planWeb6.7From $4.90 a month - 7
6.6$7 one-time - 8
DMOJ
DMOJ is an open-source platform for programming contests and an archive of programming problems.
Free planWebAPILinuxSelf-hosted6.5Free plan - 9
Coderbyte
Coderbyte is a talent evaluation platform for screening, assessing, interviewing, and upskilling candidates.
WebAPIExtension6.4From $99 a month - 10
Codewars
Codewars helps people build coding skills through community-created exercises called kata.
WebAPI6.4 - 11
Edabit
Edabit is a web-based service for practicing programming through interactive coding challenges.
Free planWeb6.4Free plan - 12
GeeksforGeeks Practice
GeeksforGeeks Practice is an online coding platform for developers and students working on programming problems.
AndroidiOSWeb6.4 - 13
6.3From $49.99 a year - 14
DOMjudge
DOMjudge automatically evaluates programming contest submissions and provides web interfaces for teams, the jury, and the public.
Free planWebAPILinuxSelf-hosted6.2Free plan - 15
Eolymp
Eolymp is a platform for creating and hosting programming competitions and learning activities.
Free planWebAPI6.2Free plan - 16
AtCoder
AtCoder is a free web-based site for competitive programming contests and practice.
Free planWeb6.1Free plan - 17
Frontend Mentor
Frontend Mentor provides browser-based front-end challenges built around professional web designs for realistic practice and portfolio building.
Free planWeb6.1Free plan - 18
Project Euler
Project Euler is a web-based collection of mathematical and computer programming problems, presented as recreational exercises.
Free planWeb6.1Free plan - 19
CodingBat
CodingBat is a free website for practicing Java and Python through live coding problems.
Free planWeb6.0Free plan - 20
Yandex Contest
Yandex Contest is an online platform for programming competitions, practice, and lessons, with automatic checking of submitted solutions.
Free planWebAPI6.0Free plan - 21
beecrowd
beecrowd is a web and API platform for practicing programming and connecting with opportunities.
Free planWebAPI5.9Free plan - 22
Codeforces
Codeforces is a programming-contest community where participants solve problems and receive ratings that reflect their skills.
Free planWebAPI5.9Free plan - 23
SQLZoo
SQLZoo is a free website for learning SQL through tutorials, reference pages, exercises, and quizzes.
Free planWeb5.9Free plan - 24
Kattis
Kattis is a free online programming service that accepts code through a browser editor, file uploads or a submission client.
WebLinux5.8 - 25
NextJudge
NextJudge is a free, open-source platform for hosting and joining competitive programming contests.
WebAPILinuxSelf-hosted5.8