
HackerRank
Project Euler
Codewars
Exercism
CodeForces
interviewing.io
Coderbyte
Practice and level up your development skills and prepare for technical interviews.

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

Which is more popular?
Based on our record, LeetCode seems to be a lot more popular than Pencil Project. While we know about 544 links to LeetCode, we've tracked only 11 mentions of Pencil Project.
Website, pricing, platforms and company facts side by side.
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| Website | leetcode.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
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 LeetCode 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.


LeetCode is a renowned online platform offering a compendium of coding challenges that enable software developers to sharpen their programming prowess, facilitating their preparation for technical interviews. This...
What are LeetCode and LeetCode alternatives good for?LeetCode💡Interested in leveling up your career? Apply to the Formation Fellowship...
In the quest for coding excellence, developers often seek platforms that not only challenge their skills but also make the learning process engaging and fun. While Leetcode has been a staple in the coding community...
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.


General Coding Assessment (GCA): the harder of the two, but manageable with preparation. It's done on CodeSignal, either in person or online. To prepare, practice DSA questions on competitive programming sites like LeetCode, Codewars,... - Source: dev.to / about 1 month ago
Category Tool URL How I used it General AI assistant ChatGPT Https://chatgpt.com Breaking down concepts, simulating interviewers, reviewing answers AI writing / reasoning Claude Https://claude.ai Refining behavioral stories and... - Source: dev.to / 4 months ago
Plain BST. Fine when input is random or the problem doesn't require worst-case guarantees. Tree problems on LeetCode typically assume balanced input and don't ask you to maintain balance yourself. - Source: dev.to / 4 months 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 LeetCode and Pencil Project, you can also consider the following products.

HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
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Project Euler is a series of challenging mathematical/computer programming problems that will...
Compare Project Euler to LeetCode or Pencil Project:



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.
Compare SuperNotecard to LeetCode or Pencil Project: