
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.

Listmonk
Sendy
TinyLetter
MailChimp
Mailman
Publicate
SendPortal
Self-hosted open-source Mailchimp clone

Which is more popular?
Based on our record, CheckIO seems to be a lot more popular than Mailtrain. While we know about 46 links to CheckIO, we've tracked only 2 mentions of Mailtrain.
Website, pricing, platforms and company facts side by side.
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| Website | checkio.org | mailtrain.org |
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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
Mailtrain is recommended for small to medium-sized businesses, developers, and organizations seeking a self-hosted email marketing solution. It is particularly suitable for those who have the technical expertise to manage and customize open-source software or those who want to keep their hosting in-house to ensure data privacy and minimize costs.
Walkthroughs and reviews on video.
Intro Video. How to get maximum from CheckiO
Review on the Austrains mailtrain pack
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using CheckIO and Mailtrain. 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 Mailtrain 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
Listmonk is fantastic -- I use it for the newsletter of my own blog and am amazed by how simple it was to set up and how easy it is to operate and use every time I send out a newsletter. Prior to Listmonk I used Mailtrain[0] and like... - Source: Hacker News / about 5 years ago
Never tried but have a look at Mosaico and GrapesJS. Both are open-sourced and used by Mailtrain. Source: over 5 years ago
When comparing CheckIO and Mailtrain, you can also consider the following products.


Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Compare Listmonk to CheckIO or Mailtrain:

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

Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Compare Sendy to CheckIO or Mailtrain:

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