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

Lepton
Simple Snippets
SnipAway
SnippetsLab
RhodeCode
TryCode
DASH
Manage your code snippets in the cloud fast, easy and free for personal use forever.

Which is more popular?
Based on our record, LeetCode seems to be a lot more popular than 3Cols. While we know about 544 links to LeetCode, we've tracked only 1 mention of 3Cols.
Website, pricing, platforms and company facts side by side.
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| Website | leetcode.com | 3cols.com |
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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
No analysis of 3Cols yet.
Walkthroughs and reviews on video.
Is A LeetCode Premium Subscription Worth It?
More videos
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using LeetCode and 3Cols. 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...
We have no reviews of 3Cols yet. Be the first one to post
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 2 months 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
3Cols - A free cloud based code snippet manager for personal and collaborative code. - Source: dev.to / about 5 years ago
When comparing LeetCode and 3Cols, 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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Lepton image compression: saving 22% losslessly from images at 15MB/s
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Project Euler is a series of challenging mathematical/computer programming problems that will...
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Simple Snippets is place to easily create and manage your code snippets. The main features of the Simple Snippets: code highlighting, snippet groups, public and private snippets.
Compare Simple Snippets to LeetCode or 3Cols:


A customizable snippet manager made for developers and people who work with code
Compare SnipAway to LeetCode or 3Cols: