
Codewars
Exercism
CodinGame
LeetCode
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.

PureRef
ArtDeck
Frame.io
BeeRef
Pixieset
Milanote
Zenfolio
FrameRef is a modern reference board for creative professionals, combining images, videos, and PDFs in one infinite canvas.

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 | frameref.app |
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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.
Intro Video. How to get maximum from CheckiO
FrameRef 1.0 – Organize All Your Reference Files in One Infinite Board
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing CheckIO and FrameRef.
FrameRef's answer:
FrameRef does everything you expect from traditional reference boards, and goes much further.
FrameRef's answer:
In addition to supporting images and GIFs, FrameRef supports videos and PDFs, and even lets you drag and drop video links from platforms like YouTube, X, and Twitch to automatically download them into your board.
FrameRef's answer:
FrameRef is designed for visual creatives such as 3D artists, game developers, concept artists, and designers who need a powerful way to organize and work with large collections of reference images, videos, and PDFs.
Share your experience with using CheckIO and FrameRef. 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 FrameRef 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 FrameRef since Feb 2026.
When comparing CheckIO and FrameRef, you can also consider the following products.


The simple way to view and organize your multiple reference images.
Compare PureRef to CheckIO or FrameRef:

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

Visual reference-board app for creatives to collect images, video, links, notes, GIFs, and PDFs, with study tools and iCloud sync across iPhone, iPad, and Mac
Compare ArtDeck to CheckIO or FrameRef:

CodinGame provides users with a fun and effective way to learn coding that eschews the rigid structure of traditional teaching methods.
Compare CodinGame to CheckIO or FrameRef:
