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Haystack is an open source NLP framework to build applications with Transformer models and LLMs.

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, Haystack NLP Framework seems to be more popular. It has been mentioned 10 times since March 2021.
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| Website | haystack.deepset.ai | diffyn.com |
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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 Haystack NLP Framework 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 immediately thought this was an update by Deepset and their Haystack framework. https://haystack.deepset.ai/ Just FYI. - Source: Hacker News / about 1 year ago
Haystack: An open-source framework for building production-ready LLM applications. - Source: dev.to / about 1 year ago
Haystack forms the backbone of our RAG system. It provides pipelines for processing documents, embedding text, and retrieving relevant information. - Source: dev.to / over 1 year ago
Tracking Diffyn since Jun 2025.
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