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BY : Deepa Sreekumar 0 comment

23 Websites For Coding Challenge & Competition

One of the best ways to learn how to code is with practice, lots and lots of practice and make coding a habit.

So the best way to practice and improve your skills in coding is through coding challenges and competitions In this blog we will look into 20 websites that help you practice programming with some sort of problems and challenges you need inorder to become proficient at coding. 


1. HackerEarth


HackerEarth is a popular coding platform that features over 8000 questions, 2000 challenges, and 1000 hackathons. It is also trusted by hiring managers across 1000+ companies. This platform has a thriving community of 3 million developers.


  • Practice (basic programming questions)
  • Contests (from beginners to week-long marathons)
  • Hackathons (solving real-world problems and business challenges)
  • Data Science competitions (testing your data science skills)

Best qualities:

The website shows the days left in competitions and contests, and it has a developer assessment software that shows your progress. There is also a remote interview feature plus analytics for companies to see your statistics.

Website: www.hackerearth.com

2. HackerRank


HackerRank is a hiring platform that is the de facto for evaluating developer skills for over 2,000 companies around the world. By enabling tech recruiters and hiring managers to objectively evaluate talent at every stage of the recruiting process, HackerRank helps companies hire skilled developers and innovate faster.


  • Coding practices
  • interview preparations

Best qualities:

HackerRank is one of the top coding practice websites out there. It is well-known for matching developers with great companies and is useful for both the employer and the employee.

Website: www.hackerrank.com



Codewars is a well-designed platform where users work together to create challenges. There are two groups of people making it work, the creators who authorize kata to teach various techniques, solve kata with solutions that enlighten others, and comment with constructive feedback, and the leaders will moderate the content and community.


  • Kata (coding practices)
  • Kumite (1v1 challenges)
  • Forum
  • Wiki

Best qualities:

Codewar has a captivating interface with unique ways of presenting the challenges, naming them as Katas, where coders gain skills and challenge other coders in Kumite. It’s one of the best places to learn to code and to have fun at the same time.

Website: www.codewars.com

4. CodeChef


CodeChef is a competitive programming platform created as a platform to help programmers elevate their skills in the world of algorithms, programming, and contests. They promote the culture of learning and friendly programming, with a huge community of problem curators.


  • Practice
  • Compete
  • Discuss
  • Host contests
  • Campus chapter

Best qualities:

CodeChef has is one of the biggest competitive programming platforms. They open their platform for anyone to host programming contests and a feature called campus chapter as a tool for programming clubs to utilize. They also host 3 contests each month where prizes are given.

CodeChef Website: www.codechef.com

5. SoloLearn


SoloLearn is one of the best places to learn how to code, with over 39 million learners, 1784 lessons, and 14k quizzes. I started learning how to code HTML and CSS on this website and it’s amazing.


  • Great website with code playground and forums
  • Mobile app to learn on the go
  • Free certificates

Best Qualities:

The best thing about SoloLearn is that all courses are free, on the website and mobile applications.

Sololearn Website: www.sololearn.com

6. CodeSignal


CodeSignal has a technical interview practice that helps you get ready for technical interviews by completing real-world assessments in an advanced IDE. It starts with customizing a personal study plan, then helps you master key topics by solving real-world questions.


  • practice and understand how to apply core concepts asked in technical interviews
  • Understand your strengths and weaknesses to know where you should be spending most of your time leading up to the interview
  • Refresh your interview knowledge and verify your understanding of important skills and concepts frequently seen in technical interviews

Best Qualities:

The best thing about CodingBat is it’s reliability and it’s used by many tech companies around the world.

CodeSignal Website: codesignal.com

7. Exercism


Exercism is in one sentence — “Code practice and mentorship for everyone”. It has 3,173 exercises across 51 languages to level up your programming skills, and insightful discussion with their dedicated team of welcoming mentors. The best part, it’s 100% free forever.


  • Language track
  • Personal mentoring
  • Practice mode

Best qualities:

Exercism starts off with language tracks that allow users to choose their preferred languages. Moreover, there are human mentors who will check your code and help you improve as you progress. This makes the platform perfect for total beginners who want to deepen their understanding of a new programming language.

Exercism website: exercism.io

8. Programmr


Programmr is an online interactive platform for anyone to learn and practice coding. They believe that the best way to learn is at your own pace in a self-taught environment. Programmr claims to make the world’s best coding simulators, where you can code and run all kinds of programs.


  • Challenges
  • Projects
  • Contests
  • Certificates

Best qualities:

Programmr has an amazing online coding simulator and a B2B API that allows anyone to integrate coding widgets into websites.

Programmr Website: http://www.programmr.com/exercises

9. TopCoder Challenges


TopCoder is a competitive programming platform. It provides a collection of algorithmic challenges that you can tackle in their own personal code editor. There’s always challenges up and running on the website and you can always participate if you’re up for it.


  • Challenges
  • Gig work

Best qualities:

The challenges have specific deadlines as well as prizes shown clearly on each one of them. They also show what kind of languages or libraries are needed. Although these challenges are not for beginners, they are very well built.

Website: https://www.topcoder.com/challenges

10. SPOJ


SPOJ is a simple website with tons of coding challenges. These challenges help you become a true programming master and gives you the skill to build efficient algorithms.


  • Contests
  • Algorithms
  • Ranks
  • Status
  • Discussion page

Best qualities:

SPOJ has tons of mind-boggling coding challenges that will really test your skills. There are contests as well for you to participate in to showcase your skills.

Website: https://www.spoj.com/

11. CodeForces


CodeForces is a collaborative platform where coders can participate in “rounds” where a time limit is set and points are distributed to the participants. CodeForces also has contests, problem sets as well as groups for coders to have at it.


  • Contests
  • Gym
  • Problem sets
  • Groups

Best qualities:

CodeForces is great for programmers who seek for fun challenges to build up their skills and join groups that suit their needs. The Gym feature is also very unique where coders can train their skills in specific challenges and see their standing at the end.

Website: https://codeforces.com/

12. CodeGym


CodeGym is an online Java Programming that is 80% based on practice. Anyone who wants to learn Java, here is the place to go.


  • Course
  • Tasks
  • Games
  • Chat
  • Forum

Best qualities:

CodeGym has practical tasks for beginners in Java to learn about all they need to know. They also have instant solution verification so that mistakes can be found immediately. CodeGym also utilizes the latest teaching techniques, with stunning visualizations and games.

Website: https://codegym.cc/

13. CodePen Challenges


CodePen is a cool online IDE that allows you to write code in your browser and see the result just as you build it. CodePen challenges is a place for leveling up your skills by building things. Each week, new challenges appear for you to tackle, and the best “Pens” get picked.


  • Teams
  • Podcasts
  • Education

Best qualities:

CodePen challenges are super fun and its a place for creativity and collaboration. There’s no competition at all because there’s nothing to lose, but you do gain skills through these challenges.

Website: https://codepen.io/

14. CodinGame


CodinGame, our goal is to let programmers keep on improving their coding skills by solving the world’s most challenging problems, learn new concepts, and get inspired by the best developers.


  • Practice
  • Compete
  • Contribute
  • Learn

Best qualities:

CodinGame helps people learn coding in the form of games, allowing them to learn the fun way. Developers can also ask for help from mentors to review their codes and compare solutions with each other.

Website: https://www.codingame.com/start

15. LeetCode


LeetCode is the best platform to help you enhance your skills, expand your knowledge and prepare for technical interviews. It’s used by hundreds of thousands of programmers for their amazing collection of algorithm practices from Amazon, Facebook, Google, LinkedIn, etc. There are over 1400 questions to practice.


  • Algorithms
  • Database
  • Shell
  • Concurrency
  • Contests

Best qualities:

LeetCode has an explore tool that helps programmers progress towards the next step in their programming career. LeetCode prepares them for technical interviews, and are involved in helping companies hire top talents as well.

Website: https://leetcode.com/problemset/all/

16. GeekForGeeks


GeeksForGeeks is the website for geeks. It has tons of resources on programming and algorithms. It also has an interview section to help programmers win their dream jobs. There’s also an excellent collection of C and C++ puzzles for programmers to solve.


  • Algorithms
  • Interview
  • Students
  • Quizzes

Best qualities:

GeeksforGeeks has myriads of articles teaching topics such as data structures, algorithms, Computer Science, and quizzes that test for knowledge and comprehension. It’s a great place to soak up some CS knowledge.


17. ProjectEuler


If you are studying algorithms and computer programming, chances are you’ve heard of Project Euler. A collection of mathematical problems made for problem solvers who are interested to combine mathematics and programming, Project Euler requires the use of mathematics to form algorithms and arrive at efficient solutions, and computer programming to actually solve it. These problems range in difficulty and they are not a walk in the park.


  • Archived problems
  • News

Best qualities:

Although the website does not have a built-in code editor or solution checker, this will be a good opportunity for programmers to download an IDE and code them on it. Moreover, solving these problems helps you develop skills that will be indispensable as a programmer, as mathematics is the underlying foundation of algorithms and data structures.


18. URI Online Judge


The URI Online Judge is developed by the Computer Science Department of URI University. The main goal of the project is to provide programming practice and knowledge sharing. Their website has a friendly UI and it contains more than 1000 problems divided in 8 big categories, solved with 11 languages.


  • Problem repositories
  • Forums
  • Competition and ranking
  • Academic
  • Contests

Best qualities:

URI his developed by university students, which means they have the mindset of beginners who want to learn coding in a fun way. Moreover, the problems are well-structured and divided accordingly, starting with beginners’ categories, and gradually into more complex topics such as computational geometry and graphs.

Website: https://www.urionlinejudge.com.br/judge/en/login

19.KickStart-Google’s Coding Competition


Kick Start is a competition by Google which offers programmer around the world a chance to develop their skills through online competition round. Each round lasts for 3 hours and they feature algorithmic challenges developed by Google engineers so that you can get a taste of what it takes to work at Google. Their rounds are held periodically so that everyone gets a chance to participate.

Best qualities:

The top-ranked programmers are given a chance to be interviewed and maybe even land a job at Google.

Website: https://codingcompetitions.withgoogle.com/kickstart/about

Hashcode is another great coding competition held by Google.

20. Code Jam


Code Jam is Google’s longest-running global coding competition, where programmers of all levels put their skills to the test. Participants must work through a series of algorithmic puzzles to win a spot in the World Finals, for a chance to be the champion and win a lofty prize of $15,000.

Best qualities: Code Jam challenges programmers around the world to solve difficult algorithmic problems in the form of 4 online rounds, and the annual Code Jam World Finals is held at different international Google offices every year. This grandiose challenge allows programmers of all levels to gain experience and motivate them to do improve their skills for a spot in the finals.

Website: https://codingcompetitions.withgoogle.com/codejam

21. Kaggle Learn


Kaggle is famous for being the place where data scientists collaborate and compete with each other. But they also have a platform called Kaggle Learn where micro-courses are provided. They are mini-courses where data scientists can learn practical data skills that they can apply immediately. They call it the fastest (and most fun) way to become a data scientist or improve your current skills. Courses available are — Python, Pandas, SQL, and, Data Visualization.


  • Tutorials
  • Exercises

Best qualities:

These micro-courses boil down complex topics down to key components which help beginners learn the important topics and gain the necessary skills in no time. Their built-in code editor, kernel, is easy to use and great for beginners.

Website: https://www.kaggle.com/competitions

22. Geektastic


Geektastic differentiates themselves from other platforms because they also offer Peer Reviewed Take Home challenges which are reviewed by experts from companies including Google and Amazon.


  • When you join Geektastic as a Developer you complete their Express Challenges, which are short multiple choice challenges.
  • The challenges are created by the community and use a ELO rating system (used for calculating the relative skill levels of players in zero-sum games such as chess) to grade both the challenges and the developers allowing you to compare yourself with the rest of their global community.

Best qualities

  • If you get selected to join their Paid Review Team (kudos if you do!!) you can earn a nice side gig reviewing code challenges submissions from the community and their client base of high end tech businesses who use the platform to test the skills of job applicants for their software engineering and DevOps roles.

Website: https://geektastic.com/


23. Edabit


Edabit is a new coding platform that features interactive tutorials in JavaScript (with Python and C# coming soon) and challenges in C#, Java, JavaScript, PHP, Python, Ruby and Swift. It’s the fastest, easiest, most addictive way to learn.


  • limitless supply of bite-sized challenges, so you can rapidly advance your abilities.
  • start on easy and progress at your own pace until you’re able to master the toughest challenges.
  • simple game mechanics to make the learning process fun and addictive. Gain XP, unlock achievements and level up.

Best Qualities

The best thing about Edabit is it’s easy to use and clean interface and the shuffle feature that adds the fun to coding tutorials.


SL no website Programming Data science URL
1 Hackerearth Yes Yes www.hackerearth.com
2 HackerRank Yes No www.hackerrank.com
3 CodeWars Yes No www.codewars.com
4 CodeChef Yes No www.codechef.com
5 Sololearn yes No www.sololearn.com
6 CodeSignal Technical Interview Practice   codesignal.com
7 Exercism Yes No exercism.io
8 Programmr Yes No http://www.programmr.com/exercises
9 TopCoder Challenges Yes No https://www.topcoder.com/challenges
10 SPOJ Yes No https://www.spoj.com/
11 CodeForces Yes No https://codeforces.com/
12 CodeGym Java  No https://codegym.cc/
13 CodePen Challenges Yes No https://codepen.io/
14 CodinGame Yes No https://www.codingame.com/start
15 LeetCode Yes No https://leetcode.com/problemset/all/
16 GeekForGeeks Yes No https://www.geeksforgeeks.org/puzzles/
17 ProjectEuler Yes No https://projecteuler.net/archives
18 URI Online Judge Yes No https://www.urionlinejudge.com.br/judge/en/login
19 KickStart — Google’s Coding Competitions Yes No https://codingcompetitions.withgoogle.com/kickstart/about
20 Edabit Yes No https://edabit.com/
21 Code Jam Yes No https://codingcompetitions.withgoogle.com/codejam
22 Kaggle Learn No Yes https://www.kaggle.com/competitions
23 Geektastic Yes No https://geektastic.com/


Choose one or two from the above list, find the one that suits you and stick to it till the end.Take part in challenges such as #100DaysofCode, which can provide you the motivation to start coding as a complete beginner, and to keep on coding. Or you can get a friend to code with you.

List of Authors

M.Sc, OCAJP, STAR Python, Team Lead: Software Training Division, ipsr solutions limited. Has 11+ years experience in IT training and has previously worked with the Ministry of Education- Maldives, NIIT, and Aptech. Expertise in Python, Machine Learning, Java, My SQL, HTML, JavaScript, AJAX, jQuery, etc., and has an exceptional career record, conducted placement support activities and corporate training, and FDP's.

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