
Codewars
Exercism
LeetCode
CodinGame
CodeCombat
HackerRank
Google's Python Class
CheckIO is a web site with a mission: To teach JavaScript and Python coding skills through a game-playing interface. It is designed to teach new skills or improve existing skills through completing challenges.

Notepin
Sublime Text
Cleartext
VS Code
Agenda
Notion
Taskade
A minimalist multi-platform text editor

Which is more popular?
Based on our record, CheckIO seems to be a lot more popular than Left. While we know about 46 links to CheckIO, we've tracked only 1 mention of Left.
Website, pricing, platforms and company facts side by side.
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| Website | checkio.org | hundredrabbits.itch.io |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using CheckIO and Left. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


CheckiO is a platform with coding games created for different levels of programmers, from beginners to advanced levels. Using fun and engaging methods, you can use coding games to solve challenges in TypeScript and...
CheckIO is available in English and Spanish. The platform was designed by a group of engineers and now has a number of customers all over the globe who may use it to improve their programming speed and abilities by...
Checkio is the most whimsical HackerRank alternative on this list. It’s also focused on two languages: Python and TypeScript. On this site you’ll be thrown into a gamer’s paradise that includes robot mollusks and...
We have no reviews of Left yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


Have you heard of CheckIO (https://checkio.org/)? They have a gameified "Mario world" of coding challenges that are smaller and come with more explanation, tests to guide you through edge cases and provide hints. The challenges start... Source: almost 3 years ago
Cyber isn't gonna be a light switch, where you can flip it and be good. Don't be too hard on yourself. Start with some hands on stuff like https://tryhackme.com or checkio.org. You could look at certs like Security+ or CySA+ for some... Source: about 3 years ago
Much better to get your hands dirty than watching the videos. Try: https://checkio.org/. Source: over 3 years ago
I wouldn't recommend it over Logseq unless you need a seriously hyperminimalist text editor that can support a small window size - I use it for creative writing and non-distracting note-taking. But if anyone wants, it's here. Source: almost 5 years ago
When comparing CheckIO and Left, you can also consider the following products.



Download and solve practice problems in over 30 different languages.
Compare Exercism to CheckIO or Left:

Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Compare Sublime Text to CheckIO or Left:

Practice and level up your development skills and prepare for technical interviews.
Compare LeetCode to CheckIO or Left:

A text editor that allows only the 1,000 most common words
Compare Cleartext to CheckIO or Left: