
Codecademy
Exercism
Treehouse
edX
LeetCode
Coursera
Pantheon
Achieve code mastery through challenge.

Penpot
draw.io
SuperNotecard
LucidChart
Linked Ideas
vym
Freeplane
Single-user mockup / wireframing / diagramming tool

Which is more popular?
Based on our record, Codewars seems to be a lot more popular than Pencil Project. While we know about 160 links to Codewars, we've tracked only 11 mentions of Pencil Project.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | codewars.com | pencil.evolus.vn |
| Pricing | ||
| Company | — | Startup from Vietnam |
| Listed in |
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
Codewars is recommended for beginner to advanced programmers who enjoy learning through practice and are interested in improving their algorithmic thinking and coding skills in a gamified environment. It is particularly beneficial for those preparing for coding interviews or seeking to reinforce their programming knowledge in a fun and interactive way.
Overall verdict
Why this product is good
Recommended for
This tool is recommended for designers, project managers, and developers who need a simple yet effective solution for GUI prototyping and wireframe creation. It is also suitable for smaller teams or individuals with limited budgets who are looking for a no-cost alternative to more complex and expensive design software.
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 Codewars and Pencil Project. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Edabit offers a learning experience similar to learning a new language, focusing on smaller and more frequent exercises that build proficiency over time. Like Codewars, Edabit provides many challenges that increase in...
In conclusion, while Leetcode remains a valuable resource for coders, the platforms listed above offer varied approaches to learning and improving coding skills. Whether you're drawn to the gamified learning...
This LeetCode alternative has excellent features for anyone looking to sharpen their coding skills. Codewars uses kata, which are small coding exercises that are community developed to help you master your language of...
Pencil Project is one of the best Visio alternatives which is open-source GUI prototyping software suitable for developers to create mockups, flow charts, floor designs, etc. It has a rich set of shapes and designed...
Recommendations tracked on public social media and blogs since March 2021.


Recently, I was working on a coding kata on codewars.com. Early on, I started thinking that a potential solution might utilize recursion, a concept that involves a function calling itself. However, I quickly realized that my grasp of... - Source: dev.to / almost 3 years ago
Get more involved. Look into internships and junior SWE positions to get a sample of what you'd be applying for once you graduate. Solve coding challenges, start working on a portfolio of your personal works. I recommend codewars.com for... Source: almost 3 years ago
I'd recommend to play around with some basic coding challenges on leetcode.com or codewars.com. If the course prepared you well you won't find this useful, but playing around with them will make sure that you are comfortable with basics... Source: about 3 years ago
I am a software developer, so doing UX is never my strength. From time to time though, I would resort to using the open source tool Pencil (https://pencil.evolus.vn/) to get a low fidelity mock-up. Lately I've been encountering bugs... - Source: Hacker News / over 3 years ago
Thanks for your replies. I checked some of them out, but I found one on my own that fits me perfectly: Pencil. Source: over 3 years ago
I wouldn't use text to illustrate a GUI. We use Pencil with the crayon-styled stencils to make quick mockups. The crayon styling makes it clear that they're just mockups so people don't poke at the style aspects of the design. We've... Source: about 4 years ago
When comparing Codewars and Pencil Project, you can also consider the following products.

Learn the technical skills you need for the job you want. As leaders in online education and learning to code, we’ve taught over 45 million people using a tested curriculum and an interactive learning environment.
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Download and solve practice problems in over 30 different languages.
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Treehouse is an award-winning online platform that teaches people how to code.
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Introducing SuperNotecard. SuperNotecard is an online writing tool that features virtual notecards to help arrange facts or scenes, track details, organize paragraphs, and clarify your composition process.
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