I Tried the Top 5 Coding Challenge Websites

ashleemboyer profile image Ashlee (she/her) Updated on ・2 min read

Thank you to everyone who replied to the following tweet! It's an excellent list of sites people like to use.

I did a quick look over all of these sites and am providing my immediate impressions from them. It's very possible they might be missing something. :) If a correction needs to be made, or if there's another really awesome thing about any of these sites that I missed, just drop a comment and I can update this post.

1. codewars

  • 20+ languages available
  • Others' solutions are available for review
  • You can practice writing your own tests

2. HackerRank

  • 20+ languages available
  • Many skills categories and challenges to explore
  • Job board seems like an added benefit :)

3. exercism

  • 50+ languages available
  • "Mentored mode"β€”the linked page has a ton of information about the structure of this
  • There's a lot of steps for each challenge, with downloading the code and then having to resubmit it. I have a preference for interactive challenge sites.

4. CodinGame

  • Several languages available (I didn't count, they were in a select)
  • Multiple types of challenges of varying skill levels
  • A bit overwhelming to me, there's a lot happening on each screen

5. ProjectEuler

  • Not an interactive coding website, BUT
  • A lot of great challenges for writing software solutions to

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Ashlee (she/her)


Disabled Web Developer ⌨️ | HOH 🀟 | Live Knitter 🧢 & Live Coder πŸ‘©β€πŸ’» | she/her


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Codewars, Hackereath, and Euler are my favorites whenever I have some time to spare I do a few challenges.

As a matter of fact being self taught I had never heard of unit testing in programming books when I was learning. I learned unit testing while doing codewars challenges.


Codewars and HackerRank are my favorites. I also like TechieDelight Is not an interactive site, but it has 500+ data structure and algorithm questions with their solutions and explanations.


they should do a code-challenge-website "real world" edition:

  • you have to wait 3 days for the confirmation
  • the task changes slightly halfway through solving it

You're into something


I've been using HackerRank as a practice on functional programming, as some problems are simple and more real world oriented problems.
It is a pretty nice tool for practicing, yet I didn't try any other in some time now (about 2 years without trying any code challenge website)


Hackereath is nice because you also have nice explanations on how algorithms work.


This is a great list of sites for coding challenges!

I've got a site called Frontend Mentor that I'd love to hear your thoughts on if you're interested in taking a look. It's very new, so is nowhere near as big or complete as these other sites.

But seeing as you're a front-end developer, it might interest you! πŸ™‚


All good sites. Another fun one is code combat where you learn to build a game. After going through some of the basics you have the tools to go off a build your own level, the code can be as simple or complex as you want it to be.


Lighthouse Labs has a 21-Day Coding Challenge! (Disclosure, I work there.) Link


I would also recommend checking codeforces.com


edabit.com has been cool as a noob dev.


So no one likes codefights/codementor ? :(


Hi, thought I might add one to the list:
warriorjs.com/ where you code adventures and solve problems in a game format.


Thanks for sharing! Exercism even has my favorite language: Rust :)


Another bonus of Codewars are the tools and guides available for writing your own katas and test suites. It's a lot of fun watching people solve your puzzles.