
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.

Axolo
Swarmia
PullNotifier
Pullflow
PRFlow.dev
Axolo for GitLab
Actioner
Stop dragging GitHub Pull Request reviews for days. Get Slack DM notifications: PR reviews, react & reply to comments, CI/CD failure alerts.

Which is more popular?
Based on our record, CheckIO seems to be more popular. It has been mentioned 46 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | checkio.org | gitnotifier.com |
| Pricing | — | |
| Company | — | Startup from France · 1 - 9 employees · 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of CheckIO yet.
GitNotifier - The best GitHub PR Notifications for Slack GitNotifier delivers high-signal GitHub pull request notifications directly to your Slack DMs, cutting through the noise so your team can ship faster. GitHub's native Slack integration floods channels with low-context events. Developers...
What each product offers, as listed by its team.


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


Overall verdict
Why this product is good
Recommended for
No analysis of GitNotifier.com yet.
Walkthroughs and reviews on video.
Intro Video. How to get maximum from CheckiO
No GitNotifier.com videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing CheckIO and GitNotifier.com.
GitNotifier.com's answer:
Cloudflare Edge serverless for blazing fast notifications.
GitNotifier.com's answer:
It's cheaper and reduce the noise as GitNotifier sends the notifications directly on your Slack DMs.
GitNotifier.com's answer:
Share your experience with using CheckIO and GitNotifier.com. 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 GitNotifier.com 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
Tracking GitNotifier.com since Jul 2026.
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Practice and level up your development skills and prepare for technical interviews.
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