HackerRank
Real Dev
Daily Coding Problem
CodinGame
Frontloops
Codewars
Code Racer
No nonsense, real world programming challenges

The modern platform for creating, sharing, and collaborating on AI prompts. Advanced version control and real-time testing.

Which is more popular?
Based on our record, hackattic seems to be more popular. It has been mentioned 3 times since March 2021.
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What each product offers, as listed by its team.

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The Ultimate Prompt Tool for Creators – Visualize & Organize with Diffyn
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing hackattic and Diffyn.
Diffyn's answer:
Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.
Diffyn's answer:
Diffyn is the platform that specializes on both change management and multi-model analysis.
Diffyn's answer:
React, Next.js, POSTGRESQL
Diffyn's answer:
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
Diffyn's answer:
I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.
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Recommendations tracked on public social media and blogs since March 2021.

I am aware of few of the resources which I've listed down below, will appreciate if you guys can share bit more. - https://hackattic.com/ : Interesting programming Problems. - Source: Hacker News / over 3 years ago
Also check out https://hackattic.com/ it has some really fun problems. - Source: Hacker News / about 4 years ago
What sort of programming would you like to do? Any real world challenges you are looking to solve? For practice “challenges” I really like https://hackattic.com/. Source: over 5 years ago
Tracking Diffyn since Jun 2025.
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